Question

这是我从查询中获得的输出。你可以看到1997年的月度销售额是1998年的月度销售额。（这里可能没有以适当的格式显示，但它们都是连续的）

Month   Year   Sales
---------------------------
1       1997   61258.07045
2       1997   38483.63504
3       1997   38547.21998
4       1997   53032.95254
5       1997   53781.28987
6       1997   36362.80255
7       1997   51020.85756
8       1997   47287.67004
9       1997   55629.24256
10      1997   66749.22589
11      1997   43533.80906
12      1997   71398.42874
1       1998   94222.11064
2       1998   99415.28734
3       1998   104854.155
4       1998   123798.6822
5       1998   18333.6304
6       1998   23245.34
7       1998   553894.34
8       1998   67004.67
9       1998   51020.85756
10      1998   38547.21998
11      1998   61258.07045
12      1998   53032.95254

如何在1997年的销售中获得1998年。象 -

Month | Sales1997 | Sales1998 
--------------------------------

我到现在为止的查询 -

Select T1.Mth, T1.Yr, T1.Sales 
 from  (Select month (o.OrderDate) Mth, 
               Year(o.orderdate)  Yr, 
               Sum((od.unitprice*od.Quantity)- (od.unitprice*od.Quantity*od.discount)) as Sales 
          from [Order Details] od 
          join Orders o on o.OrderID = od.OrderID 
 Group by month (o.OrderDate), Year(o.orderdate))  as T1 
   Where T1.Yr=1997 
      or T1.Yr=1998

Answer 1

假设SQL Server 2005+，使用CTE：

WITH summary AS (
      SELECT MONTH(o.OrderDate) AS Mth, 
             YEAR(o.orderdate) AS Yr, 
             SUM((od.unitprice * od.Quantity) - (od.unitprice*od.Quantity*od.discount)) as Sales
        FROM [Order Details] od 
        JOIN ORDERS o on o.OrderID = od.OrderID 
       WHERE YEAR(o.orderdate) IN (1997, 1998)
    GROUP BY MONTH(o.OrderDate), YEAR(o.orderdate))
  SELECT s.mth,
         MAX(CASE WHEN s.yr = 1997 THEN s.sales ELSE NULL END) AS sales1997,
         MAX(CASE WHEN s.yr = 1998 THEN s.sales ELSE NULL END) AS sales1998
    FROM summary s
GROUP BY s.mth

SQL Server 2005+还提供PIVOT/UNPIVOT。

没有CTE：

  SELECT s.mth,
         MAX(CASE WHEN s.yr = 1997 THEN s.sales ELSE NULL END) AS sales1997,
         MAX(CASE WHEN s.yr = 1998 THEN s.sales ELSE NULL END) AS sales1998
    FROM (SELECT MONTH(o.OrderDate) AS Mth, 
                 YEAR(o.orderdate) AS Yr, 
                 SUM((od.unitprice * od.Quantity) - (od.unitprice*od.Quantity*od.discount)) as Sales
            FROM [Order Details] od 
            JOIN ORDERS o on o.OrderID = od.OrderID 
           WHERE YEAR(o.orderdate) IN (1997, 1998)
        GROUP BY MONTH(o.OrderDate), YEAR(o.orderdate)) s
GROUP BY s.mth

SQL对应列

1 个答案: