MySQL数据库——子查询的基本操做

1.子查询定义 子查询(SubQuery)是指出如今其余SQL语句内的SELECT子句。web --例 SELECT * FROM t1 WHERE col1 = (SELECT col2 FROM t2); /* 1.SELECT * FROM t1，称为Outer Query/Outer Statement(外层查询/外层声明) 2.SELECT col2 FROM t2，称为SubQuery

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