[英]Apply ORDER BY to UNION MYSQL
我正在尝试在UNION
的组合中使用ORDER BY
表达式,并且收到错误
“ ORDER BY的表达式#1包含聚合函数并适用于UNION”。
(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;
正确的语法是
select * from
( query 1 union query 2 union query 3...)
order by x
编辑
您还缺少计数和外部查询的别名。 最终查询应如下所示
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;
但是,由于参数具有相同的长度,因此可以使用更简单的解决方案:
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;
您可以看到我在上面链接的同一个月中的操作
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