Question

我有以下数据

表1

TransID | Ref_Entity | Amount
--------+------------+--------
 null   | DEPOSIT    |   0.00
 null   | BANKCHARGES|   0.00
 null   | OTHERS     |   0.00

表2

TransID | Ref_Entity | Amount
--------+------------+---------
 1      | DEPOSIT    |   100.00
 1      | BANKCHARGES|   100.00
 2      | OTHERS     |   150.00

并希望输出如下：

 1 | DEPOSIT    |   100.00
 1 | BANKCHARGES|   100.00
 1 | OTHERS     |     0.00
 2 | DEPOSIT    |     0.00
 2 | BANKCHARGES|     0.00
 2 | OTHERS     |   150.00

我试过了：

SELECT 
    * (SELECT '' AS TransID, Ref_Entity, 0.00 AS Amount 
       FROM TABLE1
       UNION
       SELECT TransID, Ref_Entity, Amount 
       FROM TABLE2
      )

感谢您的帮助。

Answer 1

您需要获得TransID和Ref_Entity的独特组合，然后在LEFT JOIN上执行Table2

WITH Combinations(TransID, Ref_Entity) AS(
    SELECT 
        t2.TransID, t1.Ref_Entity
    FROM ( SELECT DISTINCT Ref_Entity FROM Table1) t1
    CROSS JOIN ( SELECT DISTINCT TransID FROM Table2) t2
)
SELECT
    c.TransID,
    c.Ref_Entity,
    Amount = ISNULL(t2.Amount, 0)
FROM Combinations c
LEFT JOIN Table2 t2
    ON c.TransID = t2.TransID
    AND c.Ref_Entity = t2.Ref_Entity;

ONLINE DEMO

没有PK加入两个表

1 个答案: