Question

我试图从昨天的总计中扣除今天的总计 - 这些总数保持在不同的行中，但我似乎无法隔离总和以减去它们以查看差异。以下是我目前在表格中的内容：

有两（2）列：

来源nchar(45)
金额decimal(19,3)

到目前为止，我一直试图：

select
( 
    select amount as TotalToday 
    from tblDailySalesvyest
    where Source = 'grand total yest'
) ,
(
    select amount as TotalYest 
    from tblDailySalesvyest
    where Source = 'grand total today'
)
from tblDailySalesvYest

但是我得到的行数和列数一样多。如何隔离每个总数并从另一个中减去一个？

Source                                          Amount
Invoiced Today                                  NULL
Invoiced Yest                                   38009.320
Credited Today                                  NULL
Credited Yest                                   -579.920
Open Orders Today                               7913.040
Open Orders Yest                                17499.162
Grand Total Yest                                129300.562
Grand Total Today                               8650.010

Answer 1

使用条件和

Successfully verified: <My Installer.exe>

Answer 2

首先，您的来源是否混合？当来源为“YEST总数”时，您将金额称为TotalToday。

那就是说，如果这是你想要的，这听起来像笛卡尔产品不是问题。我不会使用CASE，因为它往往比平连接慢。您可以加入FROM，也可以将两个完全包含的select语句嵌套在整个select中：

1

SELECT
  SUM( today.amount ) AS TotalToday,
  SUM( yest.amount ) AS TotalYest
FROM
  tblDailySalesvYest AS today,
  tblDailySalesvYest AS Yest
WHERE
  today.Source = 'grand total today' AND
  yest.Source = 'grand total yest'

2

SELECT
  ( SELECT SUM( amount ) FROM tblDailySalesvYest WHERE source = 'grand total today' ) AS TotalToday,
  ( SELECT SUM( amount ) FROM tblDailySalesvYest WHERE source = 'grand total yest' ) AS TotalYest

SQL Server：仅根据另一列

2 个答案: