错误 #1241 - Mysql 中的操作数应包含 1 列 [英] Error #1241 - Operand should contain 1 column(s) in Mysql

问题描述

我只是尝试以下查询:

SELECT *, 
      (
       SELECT count(*) 
       FROM users 
       where users.email=calls.email
      ) as ureg, 
      (
       SELECT sum(qty) 
       FROM product 
       where product.owner in 
          (SELECT * 
           from users 
           where users.email=calls.email)
      ) as pop 
FROM calls 
order by calls.data desc 
LIMIT 0,20

但我收到以下错误:

#1241 - Operand should contain 1 column(s)

我应该如何解决我的查询?

How should I fix my query?

通过改变SELECT * from users where users.email=calls.email至SELECT id from users where users.email=calls.email

之所以有效，是因为查询在用户中存在的一堆 id 中搜索 product.owner

it works because the query searches for product.owner in bunch of ids that exist in users

推荐答案

where product.owner in (SELECT *

product.owner 是一列，所以子查询应该返回一列(对应于 product.owner 的任何内容).

product.owner is one column, so the subquery should return one column (whatever corresponds to product.owner).

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