Sql 当第二个是返回多个值的子选择时，如何进行比较？

下面是我的SQL语句：

SELECT DISTINCT a.* 
   FROM OWU_Nomination as a, 
        Merchants as b WHERE a.CallFlag = 'False' 
   AND a.nominatedDate < DateAdd(hour, -24, getdate()) 
   AND a.email != (SELECT c.Email from Members as c where c.MemberID = b.MemberID)

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这里的问题是，在a.email！=返回多条记录。我想看看从subselect返回的任何电子邮件中是否有a.email，这可能吗？是否有一个包含函数或类似的函数可以执行此操作？

根据您的问题，我不确定您是否希望它位于集合中

如果必须在集合中，请使用此子句：

AND a.email IN (SELECT c.Email from Members as c where c.MemberID = b.MemberID)

否则：

AND a.email NOT IN (SELECT c.Email from Members as c where c.MemberID = b.MemberID)