＃1241 - 操作数应包含1列（S）

类别

SELECT l.* 
FROM (
    SELECT id AS category_id, 
      COALESCE(
      (
      SELECT * 
      FROM images li 
      WHERE li.category_id = dlo.id 

      ORDER BY 
         li.save_status DESC, li.category_id DESC, li.id DESC 
      LIMIT 1 
      ), 0) AS mid 
    FROM cats_imgs dlo where id='1' 
    ) lo 
JOIN images l 
ON  l.save_status = '3' 
    AND l.category_id >= lo.category_id 
    AND l.category_id <= lo.category_id 
    AND l.id >= lo.mid

一个形象，但不断收到以下错误：

#1241 - Operand should contain 1 column(s)

任何想法？

来源

2012-03-13 Ronan Dejhero

取代'*'具有用于'图像li' – newtover 2012-03-13 11:24:43

哇单个列，工作:)发布它作为答案PLZ – 2012-03-13 11:25:31

与单个列替换为*images li

来源

2012-03-13 11:26:03 newtover

我也有类似的问题。您的第三级选择语句（SELECT * FROM images li）需要返回单个值，因为第二级选择语句（SELECT id AS category_id,COALESCE(...）仅占用其占位符中的一个值。

对我而言，它工作。在这里，我还平均从第二基于表（SecondBasis）中的值的数据在一分钟基础表（MinuteBasis）：

SELECT MinuteBasis.time, MinuteBasis.avg_t, MinuteBasis.avg_p,MinuteBasis.avg_t2, 
    (SELECT avg(SecondBasis.m1) 
    FROM SecondBasis 
    WHERE SecondBasis.time BETWEEN MinuteBasis.time AND addtime (MinuteBasis.time,'0 0:00:59')) 
    (SELECT avg(SecondBasis.m2) 
    FROM SecondBasis 
    WHERE SecondBasis.time BETWEEN MinuteBasis.time AND addtime (MinutBasis.time,'0 0:00:59')) 
FROM MinuteBasis 
WHERE MinuteBasis.time BETWEEN '2012-05-02 8:30:00' AND '2012-05-02 8:44:59' ;

来源

2013-11-22 10:38:08 RexBarker

＃1241 - 操作数应包含1列（S）

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