如何在MySQL中将分组行连接为单行？

Question

我有一个像SELECT CONCAT(manufacturer, ':', COUNT(*)) AS count FROM cars GROUP BY manufacturer这样的查询，它返回的内容如下：

+---------+
| count   |
+---------+
| ford:10 |
| fiat:5  |
| kia:2   |
+---------+

现在我想把这些行GROUP_CONCAT分成1行，如：

+------------------------+
| result                 |
+------------------------+
| ford:10, fiat:5, kia:2 |
+------------------------+

但是已经有了GROUP BY，所以GROUP_CONCAT不起作用。我怎样才能用MySQL实现这个目标？

Answer 1

select Group_Concat(count SEPERATOR ',') from 
(SELECT CONCAT(manufacturer, ':', COUNT(*)) AS count
 FROM cars GROUP BY manufacturer) AS A