mysql - 操作数应包含 1 列

Question

您好，我尝试运行此查询，但出现此错误

#1241 - Operand should contain 1 column(s)

这是代码：

SELECT 

(SELECT kk.namakk, anggkk.nama AS istri
FROM kk
JOIN anggkk
USING ( idkk ) 
WHERE anggkk.hubungan =  "istri"),

(SELECT anggkk.nama AS anak, YEAR( CURDATE( ) ) - YEAR( anggkk.ttl ) AS usia_anak
FROM anggkk
JOIN kk
USING ( idkk ) 
WHERE anggkk.hubungan =  "anak")

FROM kk, anggkk
GROUP BY kk.idkk

我的错误在哪里？谢谢您的帮助！

Answer 1

Operand should contain 1 column(s), 意味着您在子查询中返回了许多列。

您需要将限制 1 添加为这样的一列

   SELECT 

 (SELECT kk.namakk, anggkk.nama AS istri
 FROM kk
 JOIN anggkk
 USING ( idkk ) 
 WHERE anggkk.hubungan =  "istri"
 LIMIT 1),

 (SELECT anggkk.nama AS anak, YEAR( CURDATE( ) ) - YEAR( anggkk.ttl ) AS usia_anak
 FROM anggkk
 JOIN kk
 USING ( idkk ) 
 WHERE anggkk.hubungan =  "anak"
 LIMIT 1)

 FROM kk, anggkk
 GROUP BY kk.idkk

或者您必须更详细地说明您选择成为一列的内容