{"id":476178,"date":"2023-08-09T07:26:52","date_gmt":"2023-08-09T07:26:52","guid":{"rendered":""},"modified":"2023-09-05T11:12:10","modified_gmt":"2023-09-05T11:12:10","slug":"cardinality-sql","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/ir\/wiki\/cardinality-sql\/","title":{"rendered":"\u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc (SQL)"},"content":{"rendered":"<p>Cardinality \u062f\u0631 SQL \u0628\u0647 \u062a\u0639\u062f\u0627\u062f \u0645\u0634\u062e\u0635\u06cc \u0627\u0632 \u0645\u0642\u0627\u062f\u06cc\u0631 \u062f\u0631 \u06cc\u06a9 \u0633\u062a\u0648\u0646 \u06cc\u0627 \u06cc\u06a9 \u0641\u0647\u0631\u0633\u062a \u0627\u0632 \u062c\u062f\u0648\u0644 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0627\u0634\u0627\u0631\u0647 \u062f\u0627\u0631\u062f. \u0646\u0642\u0634 \u0645\u0647\u0645\u06cc \u062f\u0631 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0648 \u062a\u0646\u0638\u06cc\u0645 \u0639\u0645\u0644\u06a9\u0631\u062f \u0627\u06cc\u0641\u0627 \u0645\u06cc \u06a9\u0646\u062f\u060c \u0632\u06cc\u0631\u0627 \u0628\u06cc\u0646\u0634 \u0647\u0627\u06cc\u06cc \u0631\u0627 \u062f\u0631 \u0645\u0648\u0631\u062f \u062a\u0648\u0632\u06cc\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627 \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc \u062f\u0647\u062f \u0648 \u0628\u0647 \u0645\u0648\u062a\u0648\u0631 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u062a\u0635\u0645\u06cc\u0645\u0627\u062a \u0622\u06af\u0627\u0647\u0627\u0646\u0647 \u0627\u06cc \u0631\u0627 \u0647\u0646\u06af\u0627\u0645 \u062a\u0648\u0644\u06cc\u062f \u0628\u0631\u0646\u0627\u0645\u0647 \u0647\u0627\u06cc \u0627\u062c\u0631\u0627\u06cc\u06cc \u0628\u06af\u06cc\u0631\u062f. Cardinality \u06cc\u06a9 \u0645\u0641\u0647\u0648\u0645 \u0627\u0633\u0627\u0633\u06cc \u062f\u0631 \u0632\u0645\u06cc\u0646\u0647 \u067e\u0627\u06cc\u06af\u0627\u0647 \u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u0627\u0633\u062a \u0648 \u0628\u0647 \u0637\u0648\u0631 \u06af\u0633\u062a\u0631\u062f\u0647 \u062f\u0631 \u0633\u06cc\u0633\u062a\u0645 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0645\u062f\u06cc\u0631\u06cc\u062a \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 (DBMS) \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f.<\/p>\n<h2>\u062a\u0627\u0631\u06cc\u062e\u0686\u0647 \u067e\u06cc\u062f\u0627\u06cc\u0634 Cardinality (SQL) \u0648 \u0627\u0648\u0644\u06cc\u0646 \u0630\u06a9\u0631 \u0622\u0646<\/h2>\n<p>\u0645\u0641\u0647\u0648\u0645 Cardinality \u062f\u0631 SQL \u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0628\u0647 \u0631\u0648\u0632\u0647\u0627\u06cc \u0627\u0648\u0644\u06cc\u0647 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u0631\u062f\u06cc\u0627\u0628\u06cc \u06a9\u0631\u062f. \u0645\u062f\u0644 \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u062a\u0648\u0633\u0637 \u062f\u06a9\u062a\u0631 EF Codd \u062f\u0631 \u0645\u0642\u0627\u0644\u0647 \u067e\u06cc\u0634\u06af\u0627\u0645\u0627\u0646\u0647 \u062e\u0648\u062f &quot;\u06cc\u06a9 \u0645\u062f\u0644 \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u0627\u0632 \u062f\u0627\u062f\u0647 \u0647\u0627 \u0628\u0631\u0627\u06cc \u0628\u0627\u0646\u06a9 \u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0645\u0634\u062a\u0631\u06a9 \u0628\u0632\u0631\u06af&quot; \u0645\u0646\u062a\u0634\u0631 \u0634\u062f\u0647 \u062f\u0631 \u0633\u0627\u0644 1970 \u0645\u0639\u0631\u0641\u06cc \u0634\u062f. \u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647\u060c Codd \u0627\u06cc\u062f\u0647 \u0646\u0645\u0627\u06cc\u0634 \u062f\u0627\u062f\u0647 \u0647\u0627 \u062f\u0631 \u062c\u062f\u0627\u0648\u0644 \u0628\u0627 \u0631\u062f\u06cc\u0641 \u0648 \u0633\u062a\u0648\u0646 \u0631\u0627 \u0627\u0631\u0627\u0626\u0647 \u06a9\u0631\u062f. \u0645\u062c\u0645\u0648\u0639\u0647 \u0627\u06cc \u0627\u0632 \u0639\u0645\u0644\u06cc\u0627\u062a \u0631\u06cc\u0627\u0636\u06cc \u0628\u0631\u0627\u06cc \u062f\u0633\u062a\u06a9\u0627\u0631\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627.<\/p>\n<p>\u0627\u0635\u0637\u0644\u0627\u062d &quot;Cardinality&quot; \u0628\u0639\u062f\u0627\u064b \u0628\u0627 \u062a\u06a9\u0627\u0645\u0644 \u0648 \u0628\u0644\u0648\u063a \u0633\u06cc\u0633\u062a\u0645 \u0647\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u0631\u0627\u06cc\u062c \u0634\u062f. \u0628\u0647 \u062f\u0644\u06cc\u0644 \u0627\u0647\u0645\u06cc\u062a \u0622\u0646 \u062f\u0631 \u0628\u0647\u06cc\u0646\u0647\u200c\u0633\u0627\u0632\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648\u060c \u06a9\u0647 \u062f\u0631 \u0622\u0646 \u0628\u0631\u0622\u0648\u0631\u062f \u062a\u0639\u062f\u0627\u062f \u0631\u062f\u06cc\u0641\u200c\u0647\u0627\u06cc\u06cc \u06a9\u0647 \u0627\u0632 \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0628\u0631\u06af\u0631\u062f\u0627\u0646\u062f\u0647 \u0645\u06cc\u200c\u0634\u0648\u0646\u062f \u0628\u0631\u0627\u06cc \u0627\u0646\u062a\u062e\u0627\u0628 \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631\u06cc\u0646 \u0637\u0631\u062d \u0627\u062c\u0631\u0627\u06cc\u06cc\u060c \u0636\u0631\u0648\u0631\u06cc \u0634\u062f.<\/p>\n<h2>\u0627\u0637\u0644\u0627\u0639\u0627\u062a \u062f\u0642\u06cc\u0642 \u062f\u0631 \u0645\u0648\u0631\u062f Cardinality (SQL)<\/h2>\n<p>\u062f\u0631 \u0632\u0645\u06cc\u0646\u0647 \u067e\u0627\u06cc\u06af\u0627\u0647\u200c\u0647\u0627\u06cc \u062f\u0627\u062f\u0647 SQL\u060c Cardinality \u0628\u0647 \u062a\u0639\u062f\u0627\u062f \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0645\u0627\u06cc\u0632 \u0645\u0648\u062c\u0648\u062f \u062f\u0631 \u06cc\u06a9 \u0633\u062a\u0648\u0646 \u06cc\u0627 \u06cc\u06a9 \u0641\u0647\u0631\u0633\u062a \u0627\u0634\u0627\u0631\u0647 \u062f\u0627\u0631\u062f. \u0627\u06cc\u0646 \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u0622\u0645\u0627\u0631\u06cc \u062f\u0631 \u0645\u0648\u0631\u062f \u062a\u0648\u0632\u06cc\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627 \u062f\u0631 \u06cc\u06a9 \u062c\u062f\u0648\u0644 \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc \u062f\u0647\u062f \u0648 \u0628\u0647 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631\u06cc\u0646 \u0631\u0648\u0634 \u0631\u0627 \u0628\u0631\u0627\u06cc \u067e\u0631\u062f\u0627\u0632\u0634 \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u062a\u0639\u06cc\u06cc\u0646 \u06a9\u0646\u062f.<\/p>\n<h2>\u0633\u0627\u062e\u062a\u0627\u0631 \u062f\u0627\u062e\u0644\u06cc Cardinality (SQL) \u0648 \u0646\u062d\u0648\u0647 \u0639\u0645\u0644\u06a9\u0631\u062f \u0622\u0646<\/h2>\n<p>\u0633\u0627\u062e\u062a\u0627\u0631 \u062f\u0627\u062e\u0644\u06cc Cardinality \u062f\u0631 \u0622\u0645\u0627\u0631 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u062d\u0641\u0638 \u0645\u06cc \u0634\u0648\u062f. DBMS \u0622\u0645\u0627\u0631 \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u062c\u062f\u0627\u0648\u0644 \u0648 \u0646\u0645\u0627\u06cc\u0647 \u0647\u0627 \u0631\u0627 \u0630\u062e\u06cc\u0631\u0647 \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u0634\u0627\u0645\u0644 \u0627\u0637\u0644\u0627\u0639\u0627\u062a\u06cc \u062f\u0631 \u0645\u0648\u0631\u062f \u062a\u0639\u062f\u0627\u062f \u0631\u062f\u06cc\u0641 \u0647\u0627\u060c \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0645\u0627\u06cc\u0632 \u0648 \u062a\u0648\u0632\u06cc\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627 \u0627\u0633\u062a. \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u0648\u062f\u060c \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0632 \u0627\u06cc\u0646 \u0622\u0645\u0627\u0631 \u0628\u0631\u0627\u06cc \u062a\u062e\u0645\u06cc\u0646 Cardinality \u0648 \u0627\u0646\u062a\u062e\u0627\u0628 \u0637\u0631\u062d \u0627\u062c\u0631\u0627\u06cc \u0628\u0647\u06cc\u0646\u0647 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0633\u06cc\u0633\u062a\u0645 \u0645\u062f\u06cc\u0631\u06cc\u062a \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0627\u0632 \u0627\u0644\u06af\u0648\u0631\u06cc\u062a\u0645 \u0647\u0627 \u0648 \u0633\u0627\u062e\u062a\u0627\u0631\u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u0645\u062e\u062a\u0644\u0641\u06cc \u0628\u0631\u0627\u06cc \u067e\u06cc\u06af\u06cc\u0631\u06cc \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u062f. \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u062a\u063a\u06cc\u06cc\u0631\u0627\u062a \u062f\u0627\u062f\u0647 \u062f\u0631 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u062e \u0645\u06cc \u062f\u0647\u062f\u060c \u0627\u06cc\u0646 \u0633\u0627\u062e\u062a\u0627\u0631\u0647\u0627 \u0628\u0647 \u0635\u0648\u0631\u062a \u062f\u0648\u0631\u0647 \u0627\u06cc \u06cc\u0627 \u0628\u0631 \u0627\u0633\u0627\u0633 \u062a\u0642\u0627\u0636\u0627 \u0628\u0647 \u0631\u0648\u0632 \u0645\u06cc \u0634\u0648\u0646\u062f.<\/p>\n<h2>\u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u06a9\u0644\u06cc\u062f\u06cc Cardinality (SQL)<\/h2>\n<p>\u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u06a9\u0644\u06cc\u062f\u06cc Cardinality \u062f\u0631 SQL \u0639\u0628\u0627\u0631\u062a\u0646\u062f \u0627\u0632:<\/p>\n<ol>\n<li>\n<p><strong>\u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648:<\/strong> \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u06cc\u06a9 \u0639\u0627\u0645\u0644 \u062d\u06cc\u0627\u062a\u06cc \u062f\u0631 \u062a\u0639\u06cc\u06cc\u0646 \u0628\u0631\u0646\u0627\u0645\u0647 \u0627\u062c\u0631\u0627\u06cc\u06cc \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0633\u062a. Cardinality \u0628\u0627\u0644\u0627\u062a\u0631 \u0627\u063a\u0644\u0628 \u0645\u0646\u062c\u0631 \u0628\u0647 \u0646\u0645\u0627\u06cc\u0647 \u0647\u0627\u06cc \u0627\u0646\u062a\u062e\u0627\u0628\u06cc \u0628\u06cc\u0634\u062a\u0631 \u0645\u06cc \u0634\u0648\u062f \u06a9\u0647 \u0645\u0646\u062c\u0631 \u0628\u0647 \u0627\u062c\u0631\u0627\u06cc \u0633\u0631\u06cc\u0639\u062a\u0631 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0645\u06cc \u0634\u0648\u062f.<\/p>\n<\/li>\n<li>\n<p><strong>\u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u062a\u0648\u0632\u06cc\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627:<\/strong> Cardinality \u0628\u06cc\u0646\u0634 \u0647\u0627\u06cc\u06cc \u0631\u0627 \u062f\u0631 \u0645\u0648\u0631\u062f \u062a\u0648\u0632\u06cc\u0639 \u0645\u0642\u0627\u062f\u06cc\u0631 \u062f\u0627\u062f\u0647 \u062f\u0631 \u06cc\u06a9 \u0633\u062a\u0648\u0646 \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc \u062f\u0647\u062f. \u0627\u06cc\u0646 \u0628\u0647 \u0634\u0646\u0627\u0633\u0627\u06cc\u06cc \u0645\u0634\u06a9\u0644\u0627\u062a \u0628\u0627\u0644\u0642\u0648\u0647 \u06a9\u06cc\u0641\u06cc\u062a \u062f\u0627\u062f\u0647\u060c \u0645\u0627\u0646\u0646\u062f \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u06a9\u062c \u06cc\u0627 \u0648\u0631\u0648\u062f\u06cc \u0647\u0627\u06cc \u062a\u06a9\u0631\u0627\u0631\u06cc \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<\/li>\n<li>\n<p><strong>\u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc:<\/strong> Cardinality \u0646\u0642\u0634 \u0645\u0647\u0645\u06cc \u062f\u0631 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0639\u0645\u0644\u06cc\u0627\u062a \u0627\u062a\u0635\u0627\u0644 \u0627\u06cc\u0641\u0627 \u0645\u06cc \u06a9\u0646\u062f. \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0627\u0632 Cardinality \u0633\u062a\u0648\u0646 \u0647\u0627\u06cc \u0645\u062a\u0635\u0644 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631\u06cc\u0646 \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc \u0627\u062a\u0635\u0627\u0644 \u0631\u0627 \u0627\u0646\u062a\u062e\u0627\u0628 \u06a9\u0646\u062f\u060c \u0645\u0627\u0646\u0646\u062f \u0627\u062a\u0635\u0627\u0644 \u062d\u0644\u0642\u0647 \u062a\u0648\u062f\u0631\u062a\u0648\u060c \u067e\u06cc\u0648\u0633\u062a\u0646 \u0647\u0634 \u06cc\u0627 \u0627\u062f\u063a\u0627\u0645.<\/p>\n<\/li>\n<li>\n<p><strong>\u0637\u0631\u0627\u062d\u06cc \u0634\u0627\u062e\u0635:<\/strong> Cardinality \u0628\u0631 \u0627\u062b\u0631\u0628\u062e\u0634\u06cc \u0634\u0627\u062e\u0635 \u0647\u0627\u06cc \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u062a\u0623\u062b\u06cc\u0631 \u0645\u06cc \u06af\u0630\u0627\u0631\u062f. \u0633\u062a\u0648\u0646\u200c\u0647\u0627\u06cc \u0628\u0627 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u067e\u0627\u06cc\u06cc\u0646 \u06a9\u0627\u0646\u062f\u06cc\u062f\u0627\u06cc \u0636\u0639\u06cc\u0641\u06cc \u0628\u0631\u0627\u06cc \u0646\u0645\u0627\u06cc\u0647\u200c\u0633\u0627\u0632\u06cc \u0647\u0633\u062a\u0646\u062f\u060c \u0632\u06cc\u0631\u0627 \u06af\u0632\u06cc\u0646\u0634\u200c\u067e\u0630\u06cc\u0631\u06cc \u0632\u06cc\u0627\u062f\u06cc \u0627\u0631\u0627\u0626\u0647 \u0646\u0645\u06cc\u200c\u062f\u0647\u0646\u062f\u060c \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u0633\u062a\u0648\u0646\u200c\u0647\u0627\u06cc \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc \u0628\u0627\u0644\u0627 \u06a9\u0627\u0646\u062f\u06cc\u062f\u0647\u0627\u06cc \u0628\u0647\u062a\u0631\u06cc \u0628\u0631\u0627\u06cc \u0646\u0645\u0627\u06cc\u0647\u200c\u0633\u0627\u0632\u06cc \u0647\u0633\u062a\u0646\u062f.<\/p>\n<\/li>\n<\/ol>\n<h2>\u0627\u0646\u0648\u0627\u0639 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc (SQL)<\/h2>\n<p>\u0633\u0647 \u0646\u0648\u0639 \u0627\u0635\u0644\u06cc \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f:<\/p>\n<ol>\n<li>\n<p><strong>\u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u06a9\u0645:<\/strong> \u0633\u062a\u0648\u0646\u06cc \u0628\u0627 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc \u06a9\u0645 \u062a\u0639\u062f\u0627\u062f \u06a9\u0645\u06cc \u0627\u0632 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0645\u0627\u06cc\u0632 \u0646\u0633\u0628\u062a \u0628\u0647 \u062a\u0639\u062f\u0627\u062f \u06a9\u0644 \u0631\u062f\u06cc\u0641\u200c\u0647\u0627\u06cc \u062c\u062f\u0648\u0644 \u062f\u0627\u0631\u062f. \u0645\u062b\u0627\u0644\u200c\u0647\u0627\u06cc \u0631\u0627\u06cc\u062c \u0634\u0627\u0645\u0644 \u0633\u062a\u0648\u0646\u200c\u0647\u0627\u06cc \u062c\u0646\u0633\u06cc\u062a \u06cc\u0627 \u06a9\u0634\u0648\u0631 \u0627\u0633\u062a \u06a9\u0647 \u0645\u0639\u0645\u0648\u0644\u0627\u064b \u0641\u0642\u0637 \u0686\u0646\u062f \u0645\u0642\u062f\u0627\u0631 \u0645\u0646\u062d\u0635\u0631 \u0628\u0647 \u0641\u0631\u062f \u062f\u0627\u0631\u0646\u062f \u06a9\u0647 \u062f\u0631 \u0628\u0633\u06cc\u0627\u0631\u06cc \u0627\u0632 \u0631\u062f\u06cc\u0641\u200c\u0647\u0627 \u062a\u06a9\u0631\u0627\u0631 \u0645\u06cc\u200c\u0634\u0648\u0646\u062f.<\/p>\n<\/li>\n<li>\n<p><strong>\u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u0628\u0627\u0644\u0627:<\/strong> \u06cc\u06a9 \u0633\u062a\u0648\u0646 \u0628\u0627 Cardinality \u0628\u0627\u0644\u0627 \u062f\u0627\u0631\u0627\u06cc \u062a\u0639\u062f\u0627\u062f \u0632\u06cc\u0627\u062f\u06cc \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0645\u0627\u06cc\u0632 \u0646\u0633\u0628\u062a \u0628\u0647 \u062a\u0639\u062f\u0627\u062f \u06a9\u0644 \u0631\u062f\u06cc\u0641\u200c\u0647\u0627\u06cc \u062c\u062f\u0648\u0644 \u0627\u0633\u062a. \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644\u060c \u06cc\u06a9 \u06a9\u0644\u06cc\u062f \u0627\u0635\u0644\u06cc \u06cc\u0627 \u06cc\u06a9 \u0633\u062a\u0648\u0646 \u0634\u0646\u0627\u0633\u0647 \u0645\u0646\u062d\u0635\u0631 \u0628\u0647 \u0641\u0631\u062f \u062a\u0645\u0627\u06cc\u0644 \u0628\u0647 \u062f\u0627\u0634\u062a\u0646 Cardinality \u0628\u0627\u0644\u0627\u06cc\u06cc \u062f\u0627\u0631\u062f \u0632\u06cc\u0631\u0627 \u0647\u0631 \u0631\u062f\u06cc\u0641 \u062f\u0627\u0631\u0627\u06cc \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0645\u0646\u062d\u0635\u0631 \u0628\u0647 \u0641\u0631\u062f \u0627\u0633\u062a.<\/p>\n<\/li>\n<li>\n<p><strong>\u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u0645\u062a\u0648\u0633\u0637:<\/strong> \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u0645\u062a\u0648\u0633\u0637 \u0628\u06cc\u0646 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u06a9\u0645 \u0648 \u0632\u06cc\u0627\u062f \u0642\u0631\u0627\u0631 \u0645\u06cc \u06af\u06cc\u0631\u062f. \u0633\u062a\u0648\u0646\u200c\u0647\u0627\u06cc \u0628\u0627 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u0645\u062a\u0648\u0633\u0637 \u062f\u0627\u0631\u0627\u06cc \u062a\u0639\u062f\u0627\u062f \u0645\u062a\u0648\u0633\u0637\u06cc \u0627\u0632 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0645\u0627\u06cc\u0632 \u0647\u0633\u062a\u0646\u062f\u060c \u06a9\u0647 \u0628\u0627\u0639\u062b \u0645\u06cc\u200c\u0634\u0648\u062f \u0622\u0646\u200c\u0647\u0627 \u0646\u0633\u0628\u062a \u0628\u0647 \u0633\u062a\u0648\u0646\u200c\u0647\u0627\u06cc \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc \u06a9\u0645 \u0627\u0646\u062a\u062e\u0627\u0628\u06cc\u200c\u062a\u0631 \u0628\u0627\u0634\u0646\u062f\u060c \u0627\u0645\u0627 \u0646\u0633\u0628\u062a \u0628\u0647 \u0633\u062a\u0648\u0646\u200c\u0647\u0627\u06cc \u0628\u0627 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u0628\u0627\u0644\u0627 \u0627\u0646\u062a\u062e\u0627\u0628\u06cc \u06a9\u0645\u062a\u0631\u06cc \u062f\u0627\u0631\u0646\u062f.<\/p>\n<\/li>\n<\/ol>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0645\u0642\u0627\u06cc\u0633\u0647 \u0627\u06cc \u0627\u0632 \u0633\u0647 \u0646\u0648\u0639 Cardinality \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0646\u0648\u0639 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc<\/th>\n<th>\u062a\u0639\u062f\u0627\u062f \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0645\u0627\u06cc\u0632<\/th>\n<th>\u06af\u0632\u06cc\u0646\u0634 \u067e\u0630\u06cc\u0631\u06cc<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u06a9\u0645<\/td>\n<td>\u062a\u0639\u062f\u0627\u062f \u06a9\u0645\u06cc<\/td>\n<td>\u06a9\u0645<\/td>\n<\/tr>\n<tr>\n<td>\u0645\u062a\u0648\u0633\u0637<\/td>\n<td>\u062f\u0631 \u062d\u062f \u0645\u062a\u0648\u0633\u0637<\/td>\n<td>\u0645\u062a\u0648\u0633\u0637<\/td>\n<\/tr>\n<tr>\n<td>\u0628\u0627\u0644\u0627<\/td>\n<td>\u0632\u06cc\u0627\u062f<\/td>\n<td>\u0628\u0627\u0644\u0627<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u0631\u0627\u0647\u200c\u0647\u0627\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 Cardinality (SQL)\u060c \u0645\u0634\u06a9\u0644\u0627\u062a \u0648 \u0631\u0627\u0647\u200c\u062d\u0644\u200c\u0647\u0627\u06cc \u0622\u0646\u200c\u0647\u0627 \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/h2>\n<h3>\u0631\u0627\u0647 \u0647\u0627\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 Cardinality \u062f\u0631 SQL<\/h3>\n<ol>\n<li>\n<p><strong>\u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f \u067e\u0631\u0633 \u0648 \u062c\u0648:<\/strong> Cardinality \u0628\u0647 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631\u06cc\u0646 \u0637\u0631\u062d \u0627\u062c\u0631\u0627\u06cc\u06cc \u0631\u0627 \u0627\u0646\u062a\u062e\u0627\u0628 \u06a9\u0646\u062f \u0648 \u062f\u0631 \u0646\u062a\u06cc\u062c\u0647 \u0639\u0645\u0644\u06a9\u0631\u062f \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0633\u0631\u06cc\u0639\u062a\u0631 \u0634\u0648\u062f.<\/p>\n<\/li>\n<li>\n<p><strong>\u0627\u0646\u062a\u062e\u0627\u0628 \u0641\u0647\u0631\u0633\u062a:<\/strong> \u0628\u0627 \u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 Cardinality\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u062a\u0635\u0645\u06cc\u0645\u0627\u062a \u0622\u06af\u0627\u0647\u0627\u0646\u0647 \u0627\u06cc \u062f\u0631 \u0645\u0648\u0631\u062f \u0627\u06cc\u0646\u06a9\u0647 \u06a9\u062f\u0627\u0645 \u0633\u062a\u0648\u0646 \u0647\u0627 \u0631\u0627 \u0628\u0631\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f \u0628\u0647\u062a\u0631 \u062c\u0633\u062a\u062c\u0648 \u0641\u0647\u0631\u0633\u062a \u0628\u0646\u062f\u06cc \u06a9\u0646\u06cc\u062f\u060c \u0628\u06af\u06cc\u0631\u06cc\u062f.<\/p>\n<\/li>\n<li>\n<p><strong>\u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u06a9\u06cc\u0641\u06cc\u062a \u062f\u0627\u062f\u0647 \u0647\u0627:<\/strong> Cardinality \u0628\u0647 \u0634\u0646\u0627\u0633\u0627\u06cc\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u062a\u06a9\u0631\u0627\u0631\u06cc \u06cc\u0627 \u06af\u0645\u0634\u062f\u0647 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f\u060c \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0631\u0627\u06cc \u067e\u0627\u06a9\u0633\u0627\u0632\u06cc \u0648 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627 \u062d\u06cc\u0627\u062a\u06cc \u0628\u0627\u0634\u062f.<\/p>\n<\/li>\n<\/ol>\n<h3>\u0645\u0634\u06a9\u0644\u0627\u062a \u0648 \u0631\u0627\u0647 \u062d\u0644 \u0647\u0627\u06cc \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 Cardinality \u062f\u0631 SQL<\/h3>\n<ol>\n<li>\n<p><strong>\u0622\u0645\u0627\u0631 \u0642\u062f\u06cc\u0645\u06cc:<\/strong> \u0622\u0645\u0627\u0631 \u0642\u062f\u06cc\u0645\u06cc \u06cc\u0627 \u0646\u0627\u062f\u0631\u0633\u062a \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0645\u0646\u062c\u0631 \u0628\u0647 \u0637\u0631\u062d \u0647\u0627\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc \u0646\u0627\u0645\u0637\u0644\u0648\u0628 \u0634\u0648\u062f. \u0628\u0647 \u0637\u0648\u0631 \u0645\u0646\u0638\u0645 \u0622\u0645\u0627\u0631 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u0627 \u0628\u0647 \u0631\u0648\u0632 \u06a9\u0646\u06cc\u062f \u062a\u0627 \u0627\u0632 \u0628\u0631\u0622\u0648\u0631\u062f \u062f\u0642\u06cc\u0642 Cardinality \u0627\u0637\u0645\u06cc\u0646\u0627\u0646 \u062d\u0627\u0635\u0644 \u06a9\u0646\u06cc\u062f.<\/p>\n<\/li>\n<li>\n<p><strong>\u062a\u0648\u0632\u06cc\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u06a9\u062c:<\/strong> \u062a\u0648\u0632\u06cc\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u06a9\u062c\u060c \u06a9\u0647 \u062f\u0631 \u0622\u0646 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0628\u0631 \u0633\u062a\u0648\u0646 \u063a\u0627\u0644\u0628 \u0627\u0633\u062a\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0637\u0631\u062d \u0647\u0627\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0646\u0627\u06a9\u0627\u0631\u0622\u0645\u062f \u0645\u0646\u062c\u0631 \u0634\u0648\u062f. \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0686\u0646\u06cc\u0646 \u0633\u0646\u0627\u0631\u06cc\u0648\u0647\u0627\u06cc\u06cc\u060c \u067e\u0627\u0631\u062a\u06cc\u0634\u0646 \u0628\u0646\u062f\u06cc \u06cc\u0627 \u0646\u0645\u0627\u06cc\u0647 \u0633\u0627\u0632\u06cc \u0631\u0627 \u062f\u0631 \u0646\u0638\u0631 \u0628\u06af\u06cc\u0631\u06cc\u062f.<\/p>\n<\/li>\n<li>\n<p><strong>\u0627\u0646\u062f\u0627\u0632\u0647 \u0633\u0637\u0644 \u0647\u06cc\u0633\u062a\u0648\u06af\u0631\u0627\u0645:<\/strong> \u0647\u06cc\u0633\u062a\u0648\u06af\u0631\u0627\u0645 \u0647\u0627\u06cc \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0628\u0631\u0627\u06cc \u062a\u062e\u0645\u06cc\u0646 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u062f\u0627\u0631\u0627\u06cc \u0627\u0646\u062f\u0627\u0632\u0647 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0633\u0637\u0644 \u0628\u0627\u0634\u0646\u062f \u06a9\u0647 \u0645\u0646\u062c\u0631 \u0628\u0647 \u062a\u062e\u0645\u06cc\u0646 \u0647\u0627\u06cc \u0646\u0627\u062f\u0642\u06cc\u0642 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u0645\u06cc \u0634\u0648\u062f. \u062a\u0646\u0638\u06cc\u0645 \u0627\u0646\u062f\u0627\u0632\u0647 \u0633\u0637\u0644 \u0647\u06cc\u0633\u062a\u0648\u06af\u0631\u0627\u0645 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u062f\u0642\u062a \u0631\u0627 \u0628\u0647\u0628\u0648\u062f \u0628\u062e\u0634\u062f.<\/p>\n<\/li>\n<\/ol>\n<h2>\u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u0627\u0635\u0644\u06cc \u0648 \u0645\u0642\u0627\u06cc\u0633\u0647 \u0647\u0627\u06cc \u062f\u06cc\u06af\u0631 \u0628\u0627 \u0627\u0635\u0637\u0644\u0627\u062d\u0627\u062a \u0645\u0634\u0627\u0628\u0647<\/h2>\n<h3>\u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u0647 \u062f\u0631 \u0645\u0642\u0627\u0628\u0644 \u062a\u0631\u0627\u06a9\u0645<\/h3>\n<p>Cardinality \u0648 Density \u062f\u0648 \u0645\u0641\u0647\u0648\u0645 \u0627\u0633\u0627\u0633\u06cc \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u062f\u0631 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0642\u0631\u0627\u0631 \u0645\u06cc \u06af\u06cc\u0631\u0646\u062f\u060c \u0627\u0645\u0627 \u0627\u0647\u062f\u0627\u0641 \u0645\u062a\u0641\u0627\u0648\u062a\u06cc \u062f\u0627\u0631\u0646\u062f:<\/p>\n<ul>\n<li>\n<p><strong>\u0642\u062f\u0631\u062a\u0645\u0646\u062f\u06cc<\/strong> \u0628\u0647 \u062a\u0639\u062f\u0627\u062f \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0645\u0627\u06cc\u0632 \u062f\u0631 \u06cc\u06a9 \u0633\u062a\u0648\u0646 \u06cc\u0627 \u06cc\u06a9 \u0646\u0645\u0627\u06cc\u0647 \u0627\u0634\u0627\u0631\u0647 \u062f\u0627\u0631\u062f \u06a9\u0647 \u0628\u0647 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u062f\u0631 \u062a\u062e\u0645\u06cc\u0646 \u062a\u0639\u062f\u0627\u062f \u0631\u062f\u06cc\u0641 \u0647\u0627\u06cc \u0628\u0631\u06af\u0631\u062f\u0627\u0646\u062f\u0647 \u0634\u062f\u0647 \u062a\u0648\u0633\u0637 \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<\/li>\n<li>\n<p><strong>\u062a\u0631\u0627\u06a9\u0645<\/strong> \u0645\u0646\u062d\u0635\u0631 \u0628\u0647 \u0641\u0631\u062f \u0628\u0648\u062f\u0646 \u0645\u0642\u0627\u062f\u06cc\u0631 \u062f\u0627\u062f\u0647 \u062f\u0631 \u06cc\u06a9 \u0634\u0627\u062e\u0635 \u0631\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f. \u0627\u06cc\u0646 \u0645\u0639\u06a9\u0648\u0633 Cardinality \u0627\u0633\u062a\u060c \u06a9\u0647 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u0686\u0642\u062f\u0631 \u0627\u062d\u062a\u0645\u0627\u0644 \u062f\u0627\u0631\u062f \u06a9\u0647 \u062f\u0648 \u0631\u062f\u06cc\u0641 \u0627\u0646\u062a\u062e\u0627\u0628 \u0634\u062f\u0647 \u0628\u0647 \u0637\u0648\u0631 \u062a\u0635\u0627\u062f\u0641\u06cc \u0645\u0642\u062f\u0627\u0631 \u06cc\u06a9\u0633\u0627\u0646\u06cc \u0628\u0631\u0627\u06cc \u0633\u062a\u0648\u0646 \u0646\u0645\u0627\u06cc\u0647 \u0634\u062f\u0647 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u0646\u062f.<\/p>\n<\/li>\n<\/ul>\n<p>\u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u0647\u0631 \u062f\u0648 Cardinality \u0648 Density \u0628\u0631 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u062a\u0623\u062b\u06cc\u0631 \u0645\u06cc \u06af\u0630\u0627\u0631\u0646\u062f\u060c \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u0645\u062a\u0645\u0627\u06cc\u0632 \u0631\u0627 \u0628\u0631\u0627\u06cc \u0627\u0646\u062a\u062e\u0627\u0628 \u0637\u0631\u062d \u067e\u0631\u0633 \u0648 \u062c\u0648 \u06a9\u0627\u0631\u0622\u0645\u062f \u062f\u0631 \u0627\u062e\u062a\u06cc\u0627\u0631 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0642\u0631\u0627\u0631 \u0645\u06cc \u062f\u0647\u0646\u062f.<\/p>\n<h2>\u062f\u06cc\u062f\u06af\u0627\u0647 \u0647\u0627 \u0648 \u0641\u0646\u0627\u0648\u0631\u06cc \u0647\u0627\u06cc \u0622\u06cc\u0646\u062f\u0647 \u0645\u0631\u062a\u0628\u0637 \u0628\u0627 Cardinality (SQL)<\/h2>\n<p>\u0628\u0627 \u067e\u06cc\u0634\u0631\u0641\u062a \u062a\u06a9\u0646\u0648\u0644\u0648\u0698\u06cc \u0648 \u067e\u06cc\u0686\u06cc\u062f\u0647 \u062a\u0631 \u0634\u062f\u0646 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0647\u0627\u060c \u0627\u0647\u0645\u06cc\u062a Cardinality \u062f\u0631 SQL \u0647\u0645\u0686\u0646\u0627\u0646 \u0631\u0648 \u0628\u0647 \u0631\u0634\u062f \u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f. \u0627\u0646\u062a\u0638\u0627\u0631 \u0645\u06cc\u200c\u0631\u0648\u062f \u06a9\u0647 \u067e\u06cc\u0634\u0631\u0641\u062a\u200c\u0647\u0627\u06cc \u0622\u062a\u06cc \u062f\u0631 \u0627\u0644\u06af\u0648\u0631\u06cc\u062a\u0645\u200c\u0647\u0627\u06cc \u0628\u0647\u06cc\u0646\u0647\u200c\u0633\u0627\u0632\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0648 \u062a\u06a9\u0646\u06cc\u06a9\u200c\u0647\u0627\u06cc \u0622\u0645\u0627\u0631\u06cc \u067e\u06cc\u0634\u0631\u0641\u062a\u0647\u060c \u062f\u0642\u062a \u062a\u062e\u0645\u06cc\u0646 Cardinality \u0631\u0627 \u0627\u0641\u0632\u0627\u06cc\u0634 \u062f\u0647\u062f. \u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0627\u06cc\u0646\u060c \u067e\u06cc\u0634\u0631\u0641\u062a\u200c\u0647\u0627 \u062f\u0631 \u0645\u0639\u0645\u0627\u0631\u06cc \u0633\u062e\u062a\u200c\u0627\u0641\u0632\u0627\u0631 \u0648 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0645\u0646\u062c\u0631 \u0628\u0647 \u0645\u062d\u0627\u0633\u0628\u0627\u062a \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc \u062d\u062a\u06cc \u06a9\u0627\u0631\u0622\u0645\u062f\u062a\u0631 \u0645\u06cc\u200c\u0634\u0648\u062f \u0648 \u0639\u0645\u0644\u06a9\u0631\u062f \u06a9\u0644\u06cc \u0633\u06cc\u0633\u062a\u0645\u200c\u0647\u0627\u06cc \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u0627 \u0628\u0647\u0628\u0648\u062f \u0645\u06cc\u200c\u0628\u062e\u0634\u062f.<\/p>\n<h2>\u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0627\u0632 \u0633\u0631\u0648\u0631\u0647\u0627\u06cc \u067e\u0631\u0648\u06a9\u0633\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f \u06cc\u0627 \u0628\u0627 Cardinality (SQL) \u0645\u0631\u062a\u0628\u0637 \u0634\u062f<\/h2>\n<p>\u0633\u0631\u0648\u0631\u0647\u0627\u06cc \u067e\u0631\u0648\u06a9\u0633\u06cc\u060c \u0645\u0627\u0646\u0646\u062f \u0633\u0631\u0648\u0631\u0647\u0627\u06cc \u0627\u0631\u0627\u0626\u0647 \u0634\u062f\u0647 \u062a\u0648\u0633\u0637 OneProxy\u060c \u0646\u0642\u0634 \u062d\u06cc\u0627\u062a\u06cc \u062f\u0631 \u0627\u0641\u0632\u0627\u06cc\u0634 \u062d\u0631\u06cc\u0645 \u062e\u0635\u0648\u0635\u06cc\u060c \u0627\u0645\u0646\u06cc\u062a \u0648 \u0639\u0645\u0644\u06a9\u0631\u062f \u0647\u0646\u06af\u0627\u0645 \u062f\u0633\u062a\u0631\u0633\u06cc \u0628\u0647 \u0645\u0646\u0627\u0628\u0639 \u0648\u0628 \u062f\u0627\u0631\u0646\u062f. \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u0645\u0633\u062a\u0642\u06cc\u0645\u0627\u064b \u0628\u0647 Cardinality \u062f\u0631 SQL \u0645\u0631\u0628\u0648\u0637 \u0646\u0645\u06cc \u0634\u0648\u062f\u060c \u0633\u0631\u0648\u0631\u0647\u0627\u06cc \u067e\u0631\u0627\u06a9\u0633\u06cc \u0645\u06cc \u062a\u0648\u0627\u0646\u0646\u062f \u062f\u0631 \u062a\u0631\u06a9\u06cc\u0628 \u0628\u0627 \u0628\u0631\u0646\u0627\u0645\u0647 \u0647\u0627\u06cc \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0628\u0631\u0627\u06cc \u0628\u0647\u0628\u0648\u062f \u062f\u0633\u062a\u0631\u0633\u06cc \u0648 \u062f\u0631 \u062f\u0633\u062a\u0631\u0633 \u0628\u0648\u062f\u0646 \u062f\u0627\u062f\u0647 \u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0634\u0648\u0646\u062f.<\/p>\n<p>\u0633\u0631\u0648\u0631\u0647\u0627\u06cc \u067e\u0631\u0627\u06a9\u0633\u06cc \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u0645\u0646\u0627\u0628\u0639 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u0627 \u06a9\u0647 \u0627\u063a\u0644\u0628 \u0628\u0647 \u0622\u0646\u0647\u0627 \u062f\u0633\u062a\u0631\u0633\u06cc \u062f\u0627\u0631\u0646\u062f\u060c \u0630\u062e\u06cc\u0631\u0647 \u06a9\u0646\u0646\u062f\u060c \u062a\u0639\u062f\u0627\u062f \u062f\u0631\u062e\u0648\u0627\u0633\u062a\u200c\u0647\u0627\u06cc\u06cc \u06a9\u0647 \u0628\u0647 \u0633\u0631\u0648\u0631 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0645\u06cc\u200c\u0631\u0633\u0646\u062f \u06a9\u0627\u0647\u0634 \u0645\u06cc\u200c\u06cc\u0627\u0628\u062f \u0648 \u0628\u0647 \u0637\u0648\u0631 \u0628\u0627\u0644\u0642\u0648\u0647 \u0632\u0645\u0627\u0646 \u067e\u0627\u0633\u062e\u06af\u0648\u06cc\u06cc \u0631\u0627 \u0628\u0647\u0628\u0648\u062f \u0645\u06cc\u200c\u0628\u062e\u0634\u0646\u062f. \u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0627\u06cc\u0646\u060c \u0633\u0631\u0648\u0631\u0647\u0627\u06cc \u067e\u0631\u0648\u06a9\u0633\u06cc \u0645\u06cc \u062a\u0648\u0627\u0646\u0646\u062f \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0648\u0627\u0633\u0637\u0647 \u0628\u06cc\u0646 \u06a9\u0644\u0627\u06cc\u0646\u062a \u0647\u0627 \u0648 \u067e\u0627\u06cc\u06af\u0627\u0647 \u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u0639\u0645\u0644 \u06a9\u0646\u0646\u062f \u0648 \u06cc\u06a9 \u0644\u0627\u06cc\u0647 \u0627\u0645\u0646\u06cc\u062a\u06cc \u0627\u0636\u0627\u0641\u06cc \u0648 \u0645\u062a\u0639\u0627\u062f\u0644 \u06a9\u0646\u0646\u062f\u0647 \u0628\u0627\u0631 \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u0646\u062f \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0648\u06cc\u0698\u0647 \u062f\u0631 \u0633\u0646\u0627\u0631\u06cc\u0648\u0647\u0627\u06cc \u067e\u0631 \u062a\u0631\u0627\u0641\u06cc\u06a9 \u0645\u0641\u06cc\u062f \u0628\u0627\u0634\u062f.<\/p>\n<h2>\u0644\u06cc\u0646\u06a9 \u0647\u0627\u06cc \u0645\u0631\u0628\u0648\u0637\u0647<\/h2>\n<p>\u0628\u0631\u0627\u06cc \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u0628\u06cc\u0634\u062a\u0631 \u062f\u0631 \u0645\u0648\u0631\u062f Cardinality \u062f\u0631 SQL\u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0645\u0646\u0627\u0628\u0639 \u0632\u06cc\u0631 \u0645\u0641\u06cc\u062f \u0628\u0627\u0634\u0646\u062f:<\/p>\n<ul>\n<li><a href=\"https:\/\/docs.microsoft.com\/en-us\/previous-versions\/sql\/sql-server-2008\/dd535534(v=sql.100)\" target=\"_new\" rel=\"noopener nofollow\">\u062f\u0631\u06a9 SQL Server Cardinality Estimation<\/a><\/li>\n<li><a href=\"https:\/\/www.postgresql.org\/docs\/current\/planner-stats.html\" target=\"_new\" rel=\"noopener nofollow\">\u062a\u062e\u0645\u06cc\u0646 \u06a9\u0627\u0631\u062f\u06cc\u0646\u0627\u0644\u06cc\u062a\u06cc \u062f\u0631 PostgreSQL<\/a><\/li>\n<li><a href=\"https:\/\/dev.mysql.com\/doc\/mysql\/en\/query-optimization.html\" target=\"_new\" rel=\"noopener nofollow\">MySQL Query Optimization \u0648 Cardinality<\/a><\/li>\n<\/ul>\n<p>\u0628\u0647 \u06cc\u0627\u062f \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f\u060c \u062f\u0631\u06a9 Cardinality \u0628\u0631\u0627\u06cc \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0648 \u0627\u0637\u0645\u06cc\u0646\u0627\u0646 \u0627\u0632 \u0627\u062c\u0631\u0627\u06cc \u06a9\u0627\u0631\u0622\u0645\u062f \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0628\u0633\u06cc\u0627\u0631 \u0645\u0647\u0645 \u0627\u0633\u062a. \u062f\u0631 \u062c\u0631\u06cc\u0627\u0646 \u0622\u062e\u0631\u06cc\u0646 \u067e\u06cc\u0634\u0631\u0641\u062a\u200c\u0647\u0627 \u062f\u0631 \u0641\u0646\u200c\u0622\u0648\u0631\u06cc\u200c\u0647\u0627\u06cc \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647\u060c \u0634\u0645\u0627 \u0631\u0627 \u0642\u0627\u062f\u0631 \u0645\u06cc\u200c\u0633\u0627\u0632\u062f \u062a\u0627 \u062a\u0635\u0645\u06cc\u0645\u0627\u062a \u0622\u06af\u0627\u0647\u0627\u0646\u0647 \u0628\u06af\u06cc\u0631\u06cc\u062f \u0648 \u067e\u062a\u0627\u0646\u0633\u06cc\u0644 \u06a9\u0627\u0645\u0644 \u0628\u0631\u0646\u0627\u0645\u0647\u200c\u0647\u0627\u06cc \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u062f\u0627\u062f\u0647 \u0631\u0627 \u0628\u0627\u0632 \u06a9\u0646\u06cc\u062f.<\/p>","protected":false},"featured_media":467828,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476178","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Cardinality (SQL)<\/mark>","faq_items":[{"question":"What is Cardinality in SQL?","answer":"<p>Cardinality in SQL refers to the number of distinct values present in a column or index of a database table. It helps the database engine optimize queries and make efficient execution plans.<\/p>"},{"question":"How does Cardinality work in SQL?","answer":"<p>Cardinality is maintained within the database statistics, which store information about the number of rows, distinct values, and data distribution. The query optimizer uses this information to estimate the number of rows returned by a query and choose the best execution plan.<\/p>"},{"question":"What are the types of Cardinality in SQL?","answer":"<p>There are three primary types of Cardinality:<\/p><ol><li>Low Cardinality: Few distinct values, often seen in columns like gender or country.<\/li><li>Medium Cardinality: Moderate distinct values, falling between low and high Cardinality.<\/li><li>High Cardinality: Many distinct values, common in primary key or unique identifier columns.<\/li><\/ol>"},{"question":"How can I use Cardinality in SQL?","answer":"<p>Cardinality is essential for:<\/p><ul><li>Optimizing query performance<\/li><li>Selecting appropriate indexes for better performance<\/li><li>Identifying data quality issues like duplicates or missing data<\/li><\/ul>"},{"question":"What are the challenges related to Cardinality in SQL?","answer":"<p>Problems related to Cardinality include outdated statistics, skewed data distribution, and inaccurate histogram bin sizes. Regularly updating statistics and considering partitioning or indexing can address these challenges.<\/p>"},{"question":"How is Cardinality different from Density in SQL?","answer":"<p>Cardinality represents the number of distinct values, while Density indicates the uniqueness of data values in an index. Both impact query optimization but serve different purposes.<\/p>"},{"question":"What is the future perspective of Cardinality in SQL?","answer":"<p>As technology advances, Cardinality's importance will continue to grow, leading to more accurate estimations and efficient query plans. Advancements in hardware and database architecture will further improve Cardinality computations and overall database performance.<\/p>"},{"question":"How can proxy servers be associated with Cardinality in SQL?","answer":"<p>While not directly related, proxy servers can work with database applications to improve data access and availability. They can cache frequently accessed resources, add security layers, and perform load balancing for high-traffic scenarios.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/ir\/wp-json\/wp\/v2\/wiki\/476178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/ir\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/ir\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/ir\/wp-json\/wp\/v2\/wiki\/476178\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/ir\/wp-json\/wp\/v2\/media\/467828"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/ir\/wp-json\/wp\/v2\/media?parent=476178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}