在MYSQL中对子查询的计数执行求和
我试图对从订单的子查询计数接收到的所有订单执行求和,但我收到一个错误,错误代码为:1242。子查询返回超过1行 查询:在MYSQL中对子查询的计数执行求和,mysql,sql,Mysql,Sql,我试图对从订单的子查询计数接收到的所有订单执行求和,但我收到一个错误,错误代码为:1242。子查询返回超过1行 查询: select sum((select count(orderNo) as count from order r group by r.status having r.status in ('Open','shipped In Progress','New'))); 只需按删除分组,然后使用WHERE select sum( (select count(orderNo)
select sum((select count(orderNo) as count from order r group by r.status
having r.status in ('Open','shipped In Progress','New')));
只需按删除
分组,然后使用WHERE
select sum( (select count(orderNo) as count
from order r
WHERE r.status in ('Open','shipped In Progress','New')
)
);
实际上,您不需要SUM
或子查询:
SELECT count(orderNo) as count
FROM order r
WHERE r.status in ('Open','shipped In Progress','New')
只需按
删除分组,然后使用WHERE
select sum( (select count(orderNo) as count
from order r
WHERE r.status in ('Open','shipped In Progress','New')
)
);
实际上,您不需要SUM
或子查询:
SELECT count(orderNo) as count
FROM order r
WHERE r.status in ('Open','shipped In Progress','New')
所以我想出了一个适合我的方法
select sum(a.count)
from(select count(o.order) as count from order o )a
所以我想出了一个适合我的方法
select sum(a.count)
from(select count(o.order) as count from order o )a
这相当于从r订单中选择计数(r.orderNo),其中状态在…
,否?如果我错了,请纠正我,他正在尝试对子查询中的行计数求和,这相当于从r订单中选择计数(r.orderNo),其中状态在…,否?如果我错了,请纠正我,他试图对子查询中的行数求和,那么我的答案呢?突然你不需要检查状态了?因为正如我说的,你不需要子查询。那么我的答案呢?突然你不需要检查状态了?因为正如我说的,你不需要子查询。