SQL樞軸我怎麼能做到這一點

I have 3 tables 
------------------------ 
users 
1 -> mark 
2 -> adel 
3 -> khali 
4 -> piter 
5 -> adam 

------------------------ 
groups 
1 -> group 1 
2 -> group 2 
3 -> group 3 
4 -> group 4 
---------------------- 
usersGroups 

1 -> 4 
3 -> 2 
4 -> 3 
1 -> 2 

I want to display 
if username has a group then 1 if it hasn't then 0 
like this whith pivot but I dont know how ??? 


-- username  group1 group2 group3 group4 
---------------------------------------------------- 
-- mark  0  1  0  1 
-- adel  0  1  0  0 
-- adam  0  0  1  0 



    I try this please help me 


SELECT username, [group1] AS 'group1', [group2] AS 'group2', [group3] AS 'group3', [group4] AS 'group4'  
    FROM 
    (
    SELECT ug.groupid, ug.userid, g.description, u.username FROM users u 
        INNER JOIN usersgroups ug ON u.userid = ug.userid 
        INNER JOIN groups g ON ug.groupid = g.groupid 
    )AS q 
    PIVOT 
    (COUNT(groupid) FOR [description] IN ([group1],[group2],[group3],[group4])) AS pvt

來源

2014-01-05 New_World

現在看一看我已經更新了答案。 –

測試數據

DECLARE @users TABLE (userid INT, username NVARCHAR(100)) 
INSERT INTO @users 
VALUES (1,'mark'),(2,'adel'),(3,'khali'),(4,'piter'),(5,'adam') 

DECLARE @groups TABLE (groupid INT, [description] NVARCHAR(100)) 
INSERT INTO @groups 
VALUES 
(1,'group 1'),(2,'group 2'),(3,'group 3'),(4,'group 4') 

DECLARE @usersGroups TABLE (userid INT, groupid INT) 
INSERT INTO @usersGroups 
VALUES (1,4),(3,2),(4,3),(1,2)

查詢

SELECT username 
    , CASE WHEN [group 1] IS NOT NULL THEN 1 ELSE 0 END AS 'group1' 
    , CASE WHEN [group 2] IS NOT NULL THEN 1 ELSE 0 END AS 'group2' 
    , CASE WHEN [group 3] IS NOT NULL THEN 1 ELSE 0 END AS 'group3' 
    , CASE WHEN [group 4] IS NOT NULL THEN 1 ELSE 0 END AS 'group4'  
    FROM 
    (
     SELECT ug.groupid, ug.userid, g.description, u.username 
     FROM @users u INNER JOIN @usersGroups ug 
     ON u.userid = ug.userid 
     INNER JOIN @groups g 
     ON ug.groupid = g.groupid 
    )AS q 
    PIVOT 
    (MIN(groupid) 
    FOR [description] 
    IN ([group 1],[group 2],[group 3],[group 4]) 
    ) AS pvt

結果集

╔══════════╦════════╦════════╦════════╦════════╗ 
║ username ║ group1 ║ group2 ║ group3 ║ group4 ║ 
╠══════════╬════════╬════════╬════════╬════════╣ 
║ mark  ║  0 ║  1 ║  0 ║  1 ║ 
║ khali ║  0 ║  1 ║  0 ║  0 ║ 
║ piter ║  0 ║  0 ║  1 ║  0 ║ 
╚══════════╩════════╩════════╩════════╩════════╝

來源

2014-01-05 17:56:44

但如果標有[組4] 2次它顯示2 –

@ user3163007是的，看看我已經更新了答案 –

哦tnx tnx tnx你是最好的^ _^ –

SELECT case when ug.groupid is null then 0 else 1 end as groupid, 
     ug.userid, g.description, u.username FROM users u 
LEFT JOIN usersgroups ug ON u.userid = ug.userid 
INNER JOIN groups g ON ug.groupid = g.groupid

，然後更改總COUNT(groupid)到MAX(groupid)

來源

2014-01-05 17:38:17

我這樣做，像你說 /* SELECT用戶名，[1組] AS '硫基'，[第2組] AS '組2'，[組3] AS '組3'，[組4] AS 'GROUP4' FROM （選擇情況下，當ug.groupid爲空然後爲0其他1結束爲組ID， ug.userid，g.description，u.username FROM users u LEFT JOIN usersgroups ug ON u.userid = ug.userid INNER JOIN groups g ON ug.groupid = g.groupid ）爲q PIVOT （MAX（GROUPID）FOR [描述]（[組1]，[第2組]，[第3組]，[組4]））AS PVT */ 但它顯示所有結果爲空？ –

SQL樞軸我怎麼能做到這一點

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