应用ORDER BY到UNION MYSQL

我试图用我的UNION的组合ORDER BY表达，我收到错误ORDER BY的应用ORDER BY到UNION MYSQL

“表达式＃1包含聚合函数，并适用于联盟”。

(SELECT 'SELECT' AS argument, count(argument) FROM mysql.general_log WHERE 
argument LIKE ("SELECT%")) 
UNION 
(SELECT 'INSERT' AS argument, count(argument) FROM mysql.general_log WHERE 
argument LIKE ("INSERT%")) 
UNION 
(SELECT 'UPDATE' AS argument, count(argument) FROM mysql.general_log WHERE 
argument LIKE ("UPDATE%")) 
UNION 
(SELECT 'DELETE' AS argument, count(argument) FROM mysql.general_log WHERE 
argument LIKE ("DELETE%")) 
ORDER BY count(argument) ASC;

来源

2017-06-01 Sailthor

正确的语法是

select * from 
(query 1 union query 2 union query 3...) 
order by x

编辑

你还缺少计数和外部查询的别名。最后的查询应该是这样的

这足以让我在rextester上设置一个工作示例。

SELECT argument, cnt from 
(
    (SELECT 'SELECT' AS argument, count(argument) as CNT FROM mysql.general_log WHERE 
    argument LIKE ("SELECT%")) 
    UNION 
    (SELECT 'INSERT' AS argument, count(argument) FROM mysql.general_log WHERE 
    argument LIKE ("INSERT%")) 
    UNION 
    (SELECT 'UPDATE' AS argument, count(argument) FROM mysql.general_log WHERE 
    argument LIKE ("UPDATE%")) 
    UNION 
    (SELECT 'DELETE' AS argument, count(argument) FROM mysql.general_log WHERE 
    argument LIKE ("DELETE%")) 
) aa 
ORDER BY cnt ASC;

有一个更简单的解决方案虽然，你可以使用，因为参数都相同的长度：

select substring(upper(argument), 1, 6) as argument, count(*) as cnt 
from mysql.general_log 
group by substring(upper(argument), 1, 6) 
order by cnt asc;

你可以看到，在行动中我上面

联同rextester

来源

2017-06-01 08:31:13

嗨，我迎接错误“每个派生表必须有它自己的别名” – Sailthor

感谢，但类似的错误“ORDER BY的表达式1包含聚合函数并适用于非聚合查询的结果” – Sailthor

这样做工作，非常感谢。为什么MySql要求我们使用这个别名？ – Sailthor

应用ORDER BY到UNION MYSQL

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