具有多列的MySQL子查询

Question

经过一些研究后，我现在明白我不能从子查询中返回多个列。我该怎么做呢？

 SELECT * FROM `users` WHERE `id` IN (SELECT `id1`, `id2` FROM `ids` WHERE `location` = 1)

结果为#1241 - Operand should contain 1 column(s)

Answer 1

试试这个：

Select users.* 
  from users 
    join ids 
   on users.id IN(ids.id1, ids.id2)
   and ids.location = 1;