如何连接两个表来获取自定义结果

Question

我有两个表作为A和B

表A是

OrderID   productCode   Qty  EXT  AorderID
  1         aa1         2     1     001
  1         aa2         5     2     001
  2         bb1         3     1     002

表B是

OrderID  BProductCode  BQty  BExt
   1        bbcc         7    1
   1        ccdd         8    2
   1        eeee         1    3

我想得到这样的结果......

AorderID OrderID  productCode  Qty  Ext OrderID  BProductCode  BQty BExt 
001       1        aa1         2    1     1         bbcc         7    1
001       1        aa2         5    2     1         ccdd         8    2
NULL      NULL     NULL        NULL NULL  1         eeee         1    3
002       2        bb1         3    1     NULL      NULL         NULL NULL

我尝试选择这样，

 Select A.orderID, A.productCode, A.qty , A.ext ,A.AorderID, B.OrderId , B.ProductCode , B.BQty , B.Ext A left outer join B on A.orderID = B.OrderID 

Answer 1

你应该做一个完整的外部加入

SELECT *
FROM   TableA a
       FULL OUTER JOIN TableB b
         ON a.EXT = b.BExt
            AND a.OrderID = b.OrderID 

SQL FIDDLE