Question

我已将mysql查询转换为SQL Server T-SQL查询，当我运行此查询时，出现错误：

列在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。

以下是我的问题，有人可以告诉我为什么会收到此错误吗？

libraries=['m'] => libraries=['msvcrt']

Answer 1

您必须在select by子句中包含select中未聚合的所有列。所以你的查询应该是：

SELECT t.id, t.value, t.branch_id, k.name 
FROM tb_target as t 
LEFT JOIN tb_keyindicator as k ON k.id = t.keyindicator_id 
WHERE t.branch_id IN (241) AND t.period >= '2017-09' AND t.period <  '2017-10' 
GROUP BY t.id, t.value, t.branch_id, k.name;

Answer 2

如果分组正确，则必须将aggregate function应用于以下字段：t.id, t.value, k.name。请参阅有关其他SO主题here的类似错误的更多讨论。

示例：

SELECT MIN(t.id), MIN(t.value), t.branch_id, MIN(k.name)
FROM tb_target as t 
LEFT JOIN tb_keyindicator as k ON k.id = t.keyindicator_id 
WHERE t.branch_id IN (241) AND t.period >= '2017-09' AND t.period < '2017-10' 
GROUP BY branch_id;

Answer 3

SELECT t.id, t.value, t.branch_id, k.name 
FROM tb_target as t 
LEFT JOIN tb_keyindicator as k ON k.id = t.keyindicator_id 
WHERE t.branch_id IN (241) AND t.period >= '2017-09' AND t.period < '2017-10' 
GROUP BY branch_id;

在编写查询时，您不需要

group by

一部分。所以你的查询应该是这样的。

SELECT t.id, t.value, t.branch_id, k.name 
FROM tb_target as t 
LEFT JOIN tb_keyindicator as k ON k.id = t.keyindicator_id 
WHERE t.branch_id IN (241) AND t.period >= '2017-09' AND t.period < '2017-
10';

为什么我收到“列无效”错误

3 个答案: