列出组查询中的ID

Question

我想回到一排,有一个独特的数据的每个集群amount,operation,months,和fee对于给定的ID.

表如下:

我几乎可以得到我想要的东西

SELECT amount, operation, months, fee, plan_id
FROM promo_discounts
WHERE promo_id = 1
GROUP BY amount, operation, months, fee

哪个会得到:

但请注意,plan_id当我希望它返回类似的东西时,它只返回一个1, 2, 3

这可能吗？

Answer 1

你可以用 GROUP_CONCAT

SELECT amount, operation, months, fee, 
    GROUP_CONCAT(DISTINCT plan_id SEPARATOR ',') AS plan_id
FROM promo_discounts
WHERE promo_id = 1
GROUP BY amount, operation, months, fee

请注意,默认最大长度为1024,因此如果您使用大表执行此操作,则可能会截断值...

Answer 2

看看group_concat()函数.

SELECT *, GROUP_CONCAT(id SEPARATOR ",") AS grouped_ids FROM table