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以下关于子查询和 Group By 的描述正确的有 ( )。

多选

以下关于子查询和 Group By 的描述正确的有 ( )。

A 在 Select 子句的后面，只能有两种类型的表达式，一种是组函数，一种是出现在 Group By 子句后面的列名

B 不能在子查询中包含 Order By 子句

C 没有出现在 Group By 子句后面的列名不能出现在 Select 子句非合计函数表达式中

D 如果子查询的结果为空，那么外查询条件始终不会成立

正确答案

ABCD

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