Question

我有以下查询

SELECT abm_took_id FROM pos_took WHERE DELETEDDATE IS NOT NULL

从表abm_took_id中获取pos_took的值。

现在有另一个表pos_eook由列cbm_bookid组成，这是一个外键，这是第一个表（pos_took）主键abm_took_id是一个表格第二个表格（pos_eook）的关键字为cbm_bookid。

现在我必须检查第一个查询引用中的abm_took_id提取是否存在于第二个表中，例如abm_took_id=44555从第一个查询中取出，现在它存在于第二个表中，请告知查询我可以在哪里使用或存在运营商。

Answer 1

如果您尝试在第一个表（查询）中找到不在第二个表中的所有引用：

SELECT abm_took_id
FROM pos_took
WHERE DELETEDDATE IS NOT NULL and
      abm_took_id not in (select cbm_bookid
                          from pos_eook
                          where cbm_bookid is not null
                         );

检查另一个表的第一个查询结果的引用

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