[英]How to select only non-zero values from multiple table conditional sum query
我很難消除特定表達式中具有零值的行,這里的任何幫助都非常有用
這是我的兩個簡單桌子
create table tbl1
(id int, account varchar(50), stock varchar(50), price int, vol int);
insert into tbl1 values
(1, 'a1', 's1', 10, 5),
(2, 'a1', 's2', 5, 5),
(3, 'a2', 's1', 15, 3),
(4, 'a2', 's2', 20, 2),
(5, 'a2', 's2', 20, 2);
create table tbl2
(id int, tid int, price int, vol int);
insert into tbl2 values
(1, 1, 5, 3),
(2, 1, 5, 1),
(3, 1, 15, 1),
(4, 2, 5, 3),
(5, 2, 6, 2);
我的選擇如下,它給了我所需的東西,但也給了我其中的行
(t1.vol - ifnull(Sum(t2.vol), 0))
返回零
select
t1.id,account,stock,
(t1.vol - ifnull(Sum(t2.vol), 0)) vol
from tbl1 t1
left join tbl2 t2 on t1.id=t2.tid
group by t1.id
有人可以幫我擺脫這些零值嗎?
我嘗試過having (t1.vol - ifnull(Sum(t2.vol), 0)) <> 0
==>它說vol是無效列
我嘗試where (t1.vol - ifnull(Sum(t2.vol), 0)) <> 0
==>它表示無效使用組函數
這是我上面查詢得到的輸出
ID ACCOUNT STOCK VOL
1 a1 s1 0
2 a1 s2 0
3 a2 s1 3
4 a2 s2 2
5 a2 s2 2
解:
select
t1.id,account,stock,
(t1.vol - ifnull(Sum(t2.vol), 0)) vol
from tbl1 t1
left join tbl2 t2 on t1.id=t2.tid
group by t1.id
having vol <> 0
您可以如下修改查詢
select t1.id,
t1.account,
t1.stock,
(t1.vol - coalesce(tab.vol_total,0)) as vol
from tbl1 t1
left join
(
select tid,Sum(vol) as vol_total
from tbl2
group by tid
) tab
on t1.id=tab.tid
where (t1.vol - coalesce(tab.vol_total,0)) > 0
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