MySQL學習之數據庫查詢

數據庫查詢 一、基本查詢語句 Select {* |<字段列表>}       [ From <table1>,<table2>…… [where <expr>] [group by <group by definition>]           //顯示出來按字段分組 [having <expression> {{<operator><expression>}......}]     [ord

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