SQL集团通过计算

Question

在此先感谢..

SELECT width, thickness, lengthfeet, lengthinch, Sum(nos), Sum(areasqft) 
FROM materialsdetails 
WHERE materialcode='" & Me.txtMaterialCode.Text & "' 
GROUP BY width, thickness, lengthfeet, lengthinch 
ORDER BY width, thickness, lengthfeet, lengthinch 

我用上面的代码来获得的总和领域的“号”和组“areasqft”。

在'transactionsthrough'列中（请看图片）我已经输入'Purchase'，'Issue'，'Return'和'Damage'作为数据。

事实上，而不是Sum(nos)和Sum(areasqft)我只需要值作为 购买 - 发行+回车 - 伤害与查询相同Group by领域。

Answer 1

您应该能够使用总和中的下面的if语句否定发布和损坏的值。

SELECT width 
     ,thickness 
     ,lengthfeet 
     ,lengthinch 
     ,SUM(nos*iif(or(transactionthrough="Issue",transactionthrough="Damage"),-1,1)) 
     ,SUM(areasqft*iif(or(transactionthrough="Issue",transactionthrough="Damage"),-1,1)) 
FROM materialsdetails 
WHERE materialcode = '" & Me.txtMaterialCode.Text & "' 
GROUP BY width 
     ,thickness 
     ,lengthfeet 
     ,lengthinch 
ORDER BY width 
     ,thickness 
     ,lengthfeet 
     ,lengthinch 

Answer 2

首先，按TransactionThrough：

create view byTT as 
    SELECT 
    transactionthrough, 
    sum(width) as width, 
    sum(thickness) as thickness, 
    -- etc for each column you care about 
    FROM materialsdetails 
    WHERE -- whatever where clause you want 
    group by transactionthrough; 

然后否定：

create view negByTT as 
select 
transactionthrough, 
-width as width, 
-thickness as thickness 
-- and for each other column 
from byTT; 

然后由您所关心的事务类型总结，用适当的标志：

select sum(width), sum(thickness) from (
    select width, thickness 
    from byTT where transactionthrough = "Purchase" 
    or transactionthrough = "Return" 
    union select width, thickness 
    from negByTT where transactionthrough = "Issue" 
    or transactionthrough = "Damage" 
);