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2.Êý¾Ý²éѯDATA QUERY LANGUAGE
2.1Ñ¡Ôñ²éѯSelect Query
2.2¾Û¼¯²éѯAggregate Query
2.3×Ó²éѯ  Sub Query
2.4Á¬½Ó²éѯTable Joins
2.5»ã×ܲéѯGroup Query
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3.Êý¾ÝÐÞ¸ÄDATA MODIFY LANGUAGE
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3.2ÐÞ¸ÄÊý¾ÝUpdate
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5.Êý¾Ý¿âº¯ÊýFunctions
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5.2¾Û¼¯º¯ÊýAggregate Functions
5.3×Ö·ûº¯Êýchar Functions
5.4ÈÕÆÚº¯ÊýDate Functions
5.5Êýѧº¯ÊýMath Functions
5.6·ÖÎöº¯ÊýAnalytical Functions
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6.Êý¾Ý¿â½Å±¾Script
6.1Êý¾ÝÀàÐÍData Types
6.2½Å±¾Óï·¨Statements
6.3½Å±¾ÓαêCursor
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