php - #1241 - 操作数应包含 1 列 : why?

Question

我想在主查询中使用子查询，如下所示:

SELECT distinct(cnt.crid),cu.companyName,m.*,cnt.*,m.submitDate as mSubmitDate 
from tbl_mahmoleh m,tbl_customer cu,tbl_cntreserve cnt 
where m.cuID=cu.cuID and m.mBLID=cnt.mBLID and m.cuID='12' 
      and (cnt.crID IN (SELECT DISTINCT(crID) FROM tbl_paymentcnt)) 
      and (cnt.crID IN (SELECT pc.crID, SUM( amount ) AS PaySum 
                        FROM tbl_paymentcnt pc GROUP BY pc.crID HAVING PaySum < '2000'))
ORDER BY inputDateD

但是我遇到了这个错误

Blockquote #1241 - Operand should contain 1 column(s)

Answer 1

我明白了，IN 子句不能用于多个字段，我将查询更改为以下内容，我的问题得到了解决。

SELECT DISTINCT(cnt.crid),cu.companyName,m.*,cnt.*,m.submitDate AS mSubmitDate 
FROM tbl_mahmoleh m,tbl_customer cu,tbl_cntreserve cnt 
WHERE m.cuID=cu.cuID AND m.mBLID = cnt.mBLID AND m.cuID = '12' 
AND (cnt.crID IN (SELECT DISTINCT(crID) FROM tbl_paymentcnt)) 
AND (cnt.crID IN (SELECT pc.crID FROM tbl_paymentcnt pc GROUP BY pc.crID HAVING SUM(amount) < '2500')) 
ORDER BY inputDateD