Question

我的sqlite3数据库中有2个表。有人可以帮我使用下面的sql命令：

tbltrans：

transid |  transdate | discountpercentage | Bank
12345     10/09/2011     5                  20.00

tbltrans2：

transid   |   itemnr   |price | btwpercentage | qty
12345         205        10.11        12        5
12345         302        15.00        6         7
12345         501        20.00        21        3

我的第一个问题是：

我想获得一张查询表，其中包含每笔transid和计算现金的总销售额，例如：

Select
    Sum(tbltrans2.qty * tbltrans2.price) as TotalAmount,
    (Totalamount - tbltrans.Bank) as Cash
where 
    tbltrans.transid = tbltrans2.transid 
    and transdate = '10/09/12'

有人可以更正此SQL语句吗？

- 以下问题已经解决 -

所以，任何人都可以更正我的sql代码来使用这个表格布局：

select 
    sum(price * qty - (price * qty) * (tbltrans.discountpercentage / 100)  
from 
    tbltrans2 
where 
    btwpercentage = 6) as total6 ,
  sum(price * qty - (price*qty)*(tbltrans.discountpercentage /100) from tbltrans2 where btwpercentage =12) as total12,
sum(price * qty - (price*qty)*(tbltrans.discountpercentage /100) from tbltrans2 where btwpercentage =21) as total21
 where transdate = date('10/09/2011')

Answer 1

您应该能够加入表并使用以下内容：

select 
  sum(case when t2.btwpercentage =6 then
        t2.price * t2.qty - (t2.price * t2.qty* t1.discountpercentage /100) end) Total6,
  sum(case when t2.btwpercentage =12 then
        t2.price * t2.qty - (t2.price * t2.qty* t1.discountpercentage /100) end) Total12,
  sum(case when t2.btwpercentage =21 then
        t2.price * t2.qty - (t2.price * t2.qty* t1.discountpercentage /100) end) Total21
from tbltrans t1
left join tbltrans2 t2
  on t1.transid = t2.transid
where transdate = date('10/09/2011')

请参阅SQL Fiddle with Demo

根据您的评论，您还可以使用：

select count(t1.transid) Total,
  sum(case when t2.btwpercentage =6 then
        t2.price * t2.qty - (t2.price * t2.qty* t1.discountpercentage /100) end) Total6,
  sum(case when t2.btwpercentage =12 then
        t2.price * t2.qty - (t2.price * t2.qty* t1.discountpercentage /100) end) Total12,
  sum(case when t2.btwpercentage =21 then
        t2.price * t2.qty - (t2.price * t2.qty* t1.discountpercentage /100) end) Total21
from tbltrans t1
left join tbltrans2 t2
  on t1.transid = t2.transid
where transdate = date('10/09/2011')

Answer 2

如果您希望查询基本上按照书面形式工作，那么您需要添加from子句：

Select 
sum(price * qty - (price*qty)*(tbltrans.discountpercentage /100) from tbltrans2 where btwpercentage =6) as total6 ,
 sum(price * qty - (price*qty)*(tbltrans.discountpercentage /100) from tbltrans2 where btwpercentage =12) as total12,
sum(price * qty - (price*qty)*(tbltrans.discountpercentage /100) from tbltrans2 where btwpercentage =21) as total21
from tbltrans
 where transdate = date('10/09/2011')

然而，bluefeet提供了一个更简洁的版本，虽然我会将选择逻辑写为：

sum(case when t2."btwpercentage" =6
         then  t2."price"*t2."qty" * (1 - t1."discountpercentage" /100.0)
     end) Total6,

简单的sql字符串更正

2 个答案: