问题描述
|
我有一个查询,例如
SELECT CONCAT(manufacturer,\':\',COUNT(*)) AS count FROM cars GROUP BY manufacturer
,它返回的内容如下:
+---------+
| count |
+---------+
| ford:10 |
| fiat:5 |
| kia:2 |
+---------+
现在,我想将这些行GROUP_CONCAT分成1行,例如:
+------------------------+
| result |
+------------------------+
| ford:10,fiat:5,kia:2 |
+------------------------+
但是已经有一个GROUP BY,所以GROUP_CONCAT不起作用。如何使用MysqL实现此目的?
解决方法
select Group_Concat(count SEPERATOR \',\') from
(SELECT CONCAT(manufacturer,\':\',COUNT(*)) AS count
FROM cars GROUP BY manufacturer) AS A