映射SQL表

时间:2013-05-02 21:39:25

标签: sql

SQL Server 2012: 我有表A(Cust_ID INT,P_ID UNIQUE INT,P_Name,Match_ID,Issue_Date)

Cust_ID   P_ID   P_Name  Match_ID  Issue_Date
1         214    J5        1       2009-01-01
1         478    U3        1       2013-05-02 
1         258    21        2       2003-04-05
1         369    65        2       2013-05-02
2         235    69        1       2011-05-09
2         897    36        1       2013-05-02

现在基本上,行2,3和6从第1,3和5行填充,因此它们具有相同的Match_Id,2,4,6具有今天的日期。我想创建一个映射表,如下所示:

我有一个表A(CustID,P_ID,P_Name,New_P_ID,New_P_Name)

Cust_ID   P_ID   P_Name   New_P_ID   New_P_Name
1         214     J5        478        U3   
1         258     21        369        65   
2         235     69        897        36   

请给我一个查询,我尝试过很多东西,但听起来很简单。 非常感谢。

1 个答案:

答案 0 :(得分:0)

   INSERT INTO #B  (Cust_ID ,   P_ID ,   P_Name, Match_ID )
    SELECT cust_ID , P_ID, P_Name, Match_ID from #A WHERE Issue_Date < GETDATE()
    UPDATE #B
    SET New_P_ID = NEW
    FROM ( Select New_P_ID, new = #A.P_Id from #B INNER JOIN #A ON #A.Cust_ID = #B.Cust_ID AND #A.Match_ID = #B.Match_ID AND  #A.P_ID <> #B.P_ID  ) #B

    UPDATE #B
    SET New_P_Name = NEW
    FROM ( Select New_P_Name, new = #A.P_Name from #B INNER JOIN #A ON #A.Cust_ID = #B.Cust_ID AND #A.Match_ID = #B.Match_ID AND  #A.P_ID <> #B.P_ID  ) #B