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我有两个数据库（MS SQL Server）；一个带有当前的一组报告表，另一个带有上周的一组报告表。每周我都想将每个指标中的所有指标（尽管每周的行数可能会有所不同）与前一周的指标进行比较，并确保我的 QTD 和 YTD 数字都在增加。每周的行顺序可能不同，所以无论我做什么都必须考虑到这一点。

另一个考虑因素是我有大约 50 个这样的表要比较，因此手动执行每个表都不是一个选项。拥有某种错误日志也很棒，例如当本周年初至今的值不高于上周时。

本周

+-------+------------+--------+
| Item  | TimePeriod | Number |
+-------+------------+--------+
| Pigs  | QTD        |     28 |
| Pigs  | YTD        |     86 |
| Cows  | QTD        |      7 |
| Cows  | YTD        |      9 |
| Bears | QTD        |     67 |
| Bears | YTD        |    132 |
+-------+------------+--------+

上个礼拜

+-------+------------+--------+
| Item  | TimePeriod | Number |
+-------+------------+--------+
| Bears | QTD        |     55 |
| Bears | YTD        |    120 |
| Pigs  | QTD        |     22 |
| Pigs  | YTD        |     80 |
| Cows  | QTD        |      5 |
| Cows  | YTD        |     10 |
+-------+------------+--------+

错误

错误：奶牛 YTD 当前 Week-9 Prev Week-10

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2 回答 2

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也许这样的事情会做：

SELECT 'Error ' + CW.TimePeriod + ' Current week:' + CAST(CW.Number AS VARCHAR) + ' Prev week:' + CAST(PW.Number AS VARCHAR)
FROM [Current Week DB].Table CW 
INNER JOIN [Previous DB].Table PW ON 
  CW.ITEM=PW.ITEM 
  AND CW.TIMEPERIOD=PW.TIMEPERIOD 
  AND CW.Number=PW.Number

加入所有列将给出表之间未更改的行。表的标识符显然需要更改。

于 2013-06-26T15:15:18.750 回答
0

您的问题中没有任何内容可以证明使用多个数据库或多个表是合理的。

相反，请考虑使用这样的表格。

ITEM     TIMEPERIOD  WEEKNUM     NUMBER
Bears    QTD         2013-26     67
Bears    QTD         2013-25     55
Bears    YTD         2013-26     132
Bears    YTD         2013-25     120
Cows     QTD         2013-26     7
Cows     QTD         2013-25     5
Cows     YTD         2013-26     9
Cows     YTD         2013-25     10
Pigs     QTD         2013-26     28
Pigs     QTD         2013-25     22
Pigs     YTD         2013-26     86
Pigs     YTD         2013-25     80

如果您有 SQL Server 2012，那么基本查询相对简单明了。

select 
    item, timeperiod, weeknum, number,
    number - lead (number) 
             over (partition by item, timeperiod 
                       order by item, timeperiod, weeknum desc) as change
from table1;

ITEM    TIMEPERIOD   WEEKNUM   NUMBER   CHANGE
--
Bears   QTD          2013-26   67       12
Bears   QTD          2013-25   55       (null)
Bears   YTD          2013-26   132      12
Bears   YTD          2013-25   120      (null)
Cows    QTD          2013-26   7        2
Cows    QTD          2013-25   5        (null)
Cows    YTD          2013-26   9       -1
Cows    YTD          2013-25   10       (null)
Pigs    QTD          2013-26   28       6
Pigs    QTD          2013-25   22       (null)
Pigs    YTD          2013-26   86       6
Pigs    YTD          2013-25   80       (null)

如果您只想要那些有负面变化的行，请将上一个查询用作派生表，并添加 WHERE 子句

select *
from 
  (select 
      item, timeperiod, weeknum, number,
      number - lead (number) 
               over (partition by item, timeperiod 
                         order by item, timeperiod, weeknum desc) as change
  from table1) t
where change < 0
  and timeperiod = 'YTD';

ITEM    TIMEPERIOD   WEEKNUM   NUMBER   CHANGE
--
Cows    YTD          2013-26   9       -1
于 2013-06-26T15:31:45.000 回答