mysql GROUP CONCAT 未返回值

Question

这是我的查询

SELECT 
    SUM(o.order_disc + o.order_disc_vat) AS manualsale
FROM
    orders o
WHERE
    o.order_flag IN (0 , 2, 3)
        AND o.order_status = '1'
        AND (o.assign_sale_id IN (SELECT GROUP_CONCAT(CAST(id AS SIGNED)) AS ids FROM users WHERE team_id = 92))
        AND DATE(o.payment_on) = DATE(NOW())

上面的查询 return 当我运行在终端中查询此查询时为空

当我在它下面使用子查询时 returns 数据

SELECT GROUP_CONCAT(CAST(id AS SIGNED)) AS ids FROM users WHERE team_id = 92)

以上查询 returns

'106,124,142,179'

当我运行我的第一个查询如下

SELECT 
    SUM(o.order_disc + o.order_disc_vat) AS manualsale
FROM
    orders o
WHERE
    o.order_flag IN (0 , 2, 3)
        AND o.order_status = '1'
        AND (o.assign_sale_id IN (106,124,142,179))
        AND DATE(o.payment_on) = DATE(NOW())

它return我的价值。为什么它不能使用子查询请帮忙

Answer 1

这不是你想要的：

AND (o.assign_sale_id IN (SELECT GROUP_CONCAT(CAST(id AS SIGNED)) AS ids FROM users WHERE team_id = 92))

这会将单个值与逗号分隔的值列表进行比较，因此它永远不会匹配（除非给定团队的用户中只有一行）。

您可以将其表述为：

AND assign_sale_id IN (SELECT id FROM users WHERE team_id = 92)

但这可能更有效地表达为 exists:

AND EXISTS(SELECT 1 FROM users u WHERE u.team_id = 92 AND u.id = o.assign_sale_id)

旁注：我还建议重写此条件：

AND DATE(o.payment_on) = DATE(NOW())

如下，可以利用索引：

AND o.payment_on >= current_date AND o.payment_on < current_date + interval 1 day

mysql GROUP CONCAT 未返回值

mysql GROUP CONCAT not returning values

mysql

sql

subquery

aggregate-functions

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