＃1242 - 子查询返回超过1行

Question

SELECT tblorder.fld_userid
FROM `tblordereditems`
inner JOIN tblorder ON tblorder.fld_id = tblordereditems.fld_order_id
where (SELECT sum( tblordereditems.fld_product_quantity )FROM tblordereditems inner JOIN tblorder ON tblorder.fld_id =tblordereditems.fld_order_id GROUP BY tblorder.fld_userid)>5  

这是我的查询，但会抛出错误。可以提供任何身体帮助吗？谢谢

这里有三张表。

1. tbluser
2. tblorder
3. tblordereditems

tbluser的字段fld_id是tblorder的外键，如fld_userid。
tblorder的fld_id是tblordereditems的外键，如fld_order_id，我得到的结果是fld_userid已经订购了超过5个数量的产品，即。 fld_product_quantity的总和由tblorder.fld_userid

分组

Answer 1

它返回的行数超过1行，因为您正在请求所有用户的计数。

尝试：

Select tb1.fld_userid
FROM `tblordereditems` tbi1
inner JOIN tblorder tb1 ON tb1.fld_id = tbi1.fld_order_id
where (
        SELECT sum( tbi2.fld_product_quantity ) 
        FROM tblordereditems tbi2 inner JOIN tblorder tb2 ON tb2.fld_id =tbi2 .fld_order_id 
         where tb2.fld_userid = tb1.fld_userid
)>5