Question

我想比较两列i的历史数据，我希望将今年的数据与上一年的数据进行比较。我在同一张桌子上进行了内部联接

select
    a.dt,a.brand,
    a.total_fans,
    a.fan_growth,
    b.total_fans as total_fans_BOY,
    b.fan_growth as Fan_Growth_BOY,
    b.Before_One_Year INTO TM_DATA_BOY
from
    TEMP_TM_DATA a
    LEFT JOIN TEMP_TM_DATA b
        on a.dt = b.Before_One_Year
            and a.brand = b.brand
            and a.source = b.source

（男孩=一年前）

数据在表TEMP_TM_DATA中，我使用Before_One_Year在TEMP_TM_DATA中创建了一个名为DATEADD(Year,-1,dt)的列，然后在上面的查询中使用。

The table structure is like this 


+----------------+------------+----------------+---------------------+
| Present Date   |No of fans  | NO Of fans BOY |Before One year(date)|
+----------------+------------+----------------+---------------------+
| 28-Jan-2014    | 30         |             24 |28-Jan-2013          |
| 1-Feb-2014     | 35         |             30 |1-Feb-2013           |
+-------+--------+------------+----------------+---------------------+

结果集不像上面那样显示，而是像这样显示

+----------------+------------+----------------+---------------------+
| Present Date   |No of fans  | NO Of fans BOY |Before One year(date)|
+----------------+------------+----------------+---------------------+
| 28-Jan-2014    | 30         |             24 |*28-Jan-2014*        |
| 1-Feb-2014     | 35         |             30 |*1-Feb-2014*         |
+-------+--------+------------+----------------+---------------------+

Answer 1

试试这个：

SELECT  a.dt,
        a.brand,
        a.total_fans,
        a.fan_growth,
        b.total_fans AS Total_Fans_BOY,
        b.fan_growth as Fan_Growth_BOY,
        CONVERT(VARCHAR, DATEADD(YEAR, -1, a.dt), 106) AS Before_One_Year
INTO    TM_DATA_BOY
FROM    TEMP_TM_DATA AS a LEFT JOIN 
        TEMP_TM_DATA AS b 
            ON a.brand = b.brand AND
               a.source = b.source AND
               CONVERT(VARCHAR, a.dt, 101), CONVERT(VARCHAR, DATEADD(YEAR, -1, a.dt), 101)

Answer 2

我使用了这个查询

select a.dt, a.brand, a.total_fans, a.fan_growth, b.total_fans as total_fans_BOY, b.fan_growth as Fan_Growth_BOY, a.Before_One_Year INTO TM_DATA_BOY from TEMP_TM_DATA a LEFT JOIN TEMP_TM_DATA b on a.Before_One_Year=b.dt and a.brand=b.brand and a.source=b.source

这解决了一切

比较同一表中的历史数据

2 个答案: