[英]How do I concat grouped rows as a single row in MySQL?
I have a query like SELECT CONCAT(manufacturer, ':', COUNT(*)) AS count FROM cars GROUP BY manufacturer
which returns something like: 我有一个查询,例如SELECT CONCAT(manufacturer, ':', COUNT(*)) AS count FROM cars GROUP BY manufacturer
,返回的内容如下:
+---------+
| count |
+---------+
| ford:10 |
| fiat:5 |
| kia:2 |
+---------+
Now I want to GROUP_CONCAT those rows into 1 row like: 现在,我想将这些行GROUP_CONCAT分成1行,例如:
+------------------------+
| result |
+------------------------+
| ford:10, fiat:5, kia:2 |
+------------------------+
But there's already a GROUP BY, so GROUP_CONCAT doesn't work. 但是已经有了GROUP BY,因此GROUP_CONCAT不起作用。 How can I achieve this with MySQL? 如何使用MySQL实现此目的?
select Group_Concat(count SEPERATOR ',') from
(SELECT CONCAT(manufacturer, ':', COUNT(*)) AS count
FROM cars GROUP BY manufacturer) AS A
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