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  • informatica powercenter学习笔记(三)

      以前在做DBA时在DB里写过行转列,列转行的CODE.这两天做了一下测试用INFORMATICA来实现行列互换的功能。

    列转行的SQL 实现

    ENV: RMDB

    TABLE SALES

      STORENAME QUARTER1  QUARTER2 QUARTER3 QUARTER4

      STORE1                   100                  300                  500                  700

      STORE2                   200                  400                  600                  800

    SOLUTION

     

    SELECT STORENAME,QUARTER1 AS SALES, 1 AS QUARTER

    FROM SALES

    GROUP BY STORENAME,QUARTER1

    UNION

    SELECT STORENAME,QUARTER2 AS SALES, 2 AS QUARTER

    FROM SALES

    GROUP BY STORENAME,QUARTER2

    UNION

    SELECT STORENAME,QUARTER3 AS SALES, 3 AS QUARTER

    FROM SALES

    GROUP BY STORENAME,QUARTER3

    UNION

    SELECT STORENAME,QUARTER4 AS SALES, 4 AS QUARTER

    FROM SALES

    GROUP BY STORENAME,QUARTER4

     

     

      列转行的INFORMATICA 实现

     

    1 SOURCE  TABLES 导入MAPING

    2 SQLQUALIFER 读取数据

    3 NORMALIZER 实现对应的列行转换,在NORMALIZER属性里设置STORENAME,QUARTER DATA(LEVEL 1,每季度的销售值SALESLEVEL2. QUARTER DATAOCCURS值设为4就可实现列行转换

    二  行转列的SQL 实现

    ENV:

    create table sales2(storename varchar(20),

    sales number(9),quarter number(9))

    select * from sales2

    SOLUTION:

    SELECT STORENAME,

     MAX(CASE WHEN QUARTER=1 THEN SALES ELSE 0 END) QUARTER1,

     MAX(CASE WHEN QUARTER=2 THEN SALES ELSE 0 END) QUARTER2,

     MAX(CASE WHEN QUARTER=3 THEN SALES ELSE 0 END) QUARTER3,

     MAX(CASE WHEN QUARTER=4 THEN SALES ELSE 0 END) QUARTER4

     FROM SALES2

     GROUP BY STORENAME

     ORDER BY STORENAME

    INFORMATICA 实现

      1 导入源表SALES2

      2 SQLQULIFER读取数据

      3 用EXPERSSION TRANSFORMATION 来判断QUARTER值来取SALES值

          4 用聚合函数来取出判断后的最大值,即真正的SALES值

      5 导入到目标表或目标文件后即实现了行转列的功能。

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  • 原文地址:https://www.cnblogs.com/HondaHsu/p/4422200.html
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