sql - 在一个查询中聚合分组结果集中的所有单个列 : is it possible?

Question

目前我有以下 MySQL 查询:

SELECT 
    COUNT(*) AS `count`, 
    `v`.`value` 
FROM `client_entity_int` AS `v` 
INNER JOIN `client_entity` AS `e` 
ON e.id = v.entity_id 
WHERE (v.attribute_id = '1') AND (e.deleted = 0) 
GROUP BY `v`.`value`

返回以下内容:

+-------+-------+
| count | value |
+-------+-------+
|     9 |     0 |
|    11 |     1 |
+-------+-------+

我希望它返回的是上面的内容，包括显示在上述查询中找到的所有 entity_id 的逗号分隔聚合的列。

这在同一个查询中是否可行，如果可行，如何实现？示例:

+-------+------------------+
| count | value | entities |
+-------+-------+----------|
|     9 |     0 |  1,2,3,4 |
|    11 |     1 |          |
+-------+-------+----------|

Answer 1

使用:

  SELECT COUNT(*) 'count', 
         v.value,
         GROUP_CONCAT(DISTINCT v.entity_id ORDER BY v.entityid ASC SEPARATOR ',') 'entities'
    FROM client_entity_int AS v 
    JOIN client_entity AS e ON e.id = v.entity_id 
   WHERE v.attribute_id = '1'
     AND e.deleted = 0
GROUP BY v.value

引用:GROUP_CONCAT

您只需要为 MySQL 关键字使用反引号。