一个 where 子句中可以有多个子查询吗？

Question

我没有这方面的例子，但我只是想知道这样的事情是否在任何情况下都有效：

SELECT somefield
FROM sometable
WHERE something1 IN (SELECT somefield2 FROM sometable2)
  AND something2 IN (SELECT somefield3 FROM sometable3)

Answer 1

一句话-是的。您可以在 where 子句中设置任意数量的条件，无论它们是否具有 in 条件。

Answer 2

是的。不过您的语法需要修正：

SELECT somefield
FROM sometable
WHERE something1 IN (SELECT somefield2 FROM sometable2)                        
AND something2 IN (SELECT somefield3 FROM sometable3)

一个 where 子句中可以有多个子查询吗？

Can you have more than one subquery in a where clause?

sql

select

subquery

sql-in