two,mySQL多表查詢

一,DQL語句 ;將數據庫所有數據查詢出來,select字段,from表名,where條件.不夠 1).比較運算符; > 大於 < 小於 <=小於等於 >=大於等於 <>,!=不等於Select * from student where english>80. 2).邏輯運算符; and , or ,notSelect * from student where math> 20 and sex =

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