我正在使用 WHERE XXX IN (SQL),所以 (SQL) 必须只选择一列
在这种情况下,我customer_id
从一个组中选择一些,而那些客户只属于该组
WHERE `id_customer` IN(
SELECT g.`id_customer` // this must select *only one* column
FROM ps_customer_group AS g
Group By g.`id_customer`
Having COUNT(g.`id_customer`) = 1
AND g.`id_group`=3 // **- Unknown column 'g.id_group' in 'having clause'**
)
原始数据看起来像这样,顺便说一句,这不是结果