Mysql中on,in,as,where的區別

答:Where查詢條件,on內外連接時候用,as作爲別名,in查詢某值是否在某條件裏 創建2個表:student,score student:  score: where SELECT * FROM student WHERE s_sex='男' 例如:on SELECT * FROM student LEFT JOIN score on student.s_id=score.s_id; on和w
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