獲得多行從行單元格值

Question

我有臺這樣的

Id Flag1 Flag2  Desc 
-- ----- ------ ----- 
1  1  1  XXX 
2  1  0  YYY 

，我想造成這樣的

Id Flag1 Flag2  Desc 
-- ----- ------ ----- 
1  1  1  XXX 
1  1  1  XXX 
2  1  0  YYY 

其中用於標記每個條目是真的。

如何做到這一點？

Answer 1

UPDATE

既然你有16個標誌列，你可以使用一個數字表像這樣以減少總UNION ALL查詢。只需在一行中添加總標誌並將其與Numbers表的row_number進行比較即可。

查詢

;WITH Numbers AS (SELECT 1 rn UNION ALL SELECT 1 rn UNION ALL SELECT 1 rn UNION ALL SELECT 1), 
Numbers1 AS (SELECT ROW_NUMBER()OVER(ORDER BY c1.rn) as rn FROM Numbers c1 CROSS JOIN Numbers c2) 
SELECT Id, Flag1, Flag2, [Desc] FROM flagtable 
INNER JOIN Numbers1 N ON N.rn <= CONVERT(INT,flag1) + CONVERT(INT,flag2) 
ORDER BY Id ASC 

---

您可以使用UNION ALL。像這樣的東西。

查詢

SELECT Id, Flag1, Flag2, [Desc] FROM flagtable WHERE Flag1 = 1 
UNION ALL 
SELECT Id, Flag1, Flag2, [Desc] FROM flagtable WHERE Flag2 = 1 
ORDER BY Id 

輸出

Id Flag1 Flag2 Desc 
1 1 1 XXX 
1 1 1 XXX 
2 1 0 YYY 

Answer 2

WITH tbl(id,flag1,flag2,cnt,descp,idx) AS 
    (SELECT id, 
    flag1, 
    flag2, 
    CASE 
     WHEN Flag1=1 
     AND Flag2 =1 
     THEN 2 
     ELSE 1 
    END cnt, 
    descp, 
    1 
    FROM test2 
    UNION ALL 
    SELECT a.id, 
    a.flag1, 
    a.flag2, 
    b.cnt, 
    a.descp, 
    b.idx+1 
    FROM test2 a 
    JOIN tbl b 
    ON (a.id  =b.id 
    AND b.idx+1 <= b.cnt) 
) 
SELECT * FROM tbl ORDER BY id 

查詢結果集的