SQL分组作为一列中以逗号分隔的值列表

Question

我正在使用API​​来返回场地列表。

SELECT 
    `sample`.Fascia AS 'Fascia',
    `sample`.Category AS 'Category'
FROM
    `sample`
WHERE 
    `sample`.`PostCode` LIKE '%SW1%'

然后返回一个场地列表。

Fascia      | Category
------------+-------------
Sainsbury's | Supermarkets
Waitrose    | Supermarkets
99p Store   | Hardware
T K Max     | Clothing

如何修改查询以将类别组合在一起并创建一个抽象列，将这些场所列为逗号列表。像这样的东西

Category      | Grouped Venues
--------------+------------------------
Supermarkets  | Sainsbury's, Waitrose
Hardware      | 99p Store
Clothing      | T K Max

Answer 1

使用Group_concat：

        SELECT 
        Group_concat(`sample`.Fascia) AS 'Grouped Venues',
        `sample`.Category AS 'Category'
        FROM
        `sample`
        WHERE `sample`.`PostCode` LIKE '%SW1%'
        Group by `sample`.Category