SQL - 一個每

Question

行

我有一個名爲寄存器的表項，包含如下3個字段：

Select PersonID, RegisterID, Status from Registers 

PersonID RegisterID Status 
------------------------------- 
3049518  14467  A 
3049518  14467  B 
3049518  14467  C 
3049518  32445  A 
3049518  32445  B 
3049518  32445  C 

有沒有一種簡單的方法來顯示每個註冊的單行線，其狀態一起？例如

PersonID RegisterID Status1 Status2 Status3 
------------------------------------------------ 
3049518  14467  A  B  C 
3049518  32445  A  B  C 

在此先感謝。

Answer 1

你可以做這樣的事情

SELECT SUBSTRING((SELECT ',' + CONVERT(VARCHAR , Status)  
                  FROM DBO.Registers WITH (NOLOCK) 

                  FOR XML PATH('')),2,20000)),'') 

或者提供SQL小提琴讓我寫完整的查詢

Answer 2

如果你有狀態的固定數量的，你知道的狀態值，那麼你可以得到你使用下面的代碼後是什麼。

CREATE TABLE #Register(PersonID int, RegisterID int, Stat varchar) 

INSERT INTO #Register (PersonID,RegisterID,Stat) VALUES 
('3049518','14467','A'), 
('3049518','14467','B'), 
('3049518','14467','C'), 
('3049518','32445','A'), 
('3049518','32445','B'), 
('3049518','32445','C') 

SELECT PersonID 
    ,RegisterID 
    ,MAX(A) 'A' 
    ,MAX(B) 'B' 
    ,MAX(C) 'C' 
FROM (
    SELECT PersonID 
     ,RegisterID 
     ,CAST(CASE 
       WHEN r.stat = 'A' 
        THEN 'A' 
       ELSE NULL 
       END AS VARCHAR) AS 'A' 
     ,CAST(CASE 
       WHEN r.stat = 'B' 
        THEN 'B' 
       ELSE NULL 
       END AS VARCHAR) AS 'B' 
     ,CAST(CASE 
       WHEN r.stat = 'C' 
        THEN 'C' 
       ELSE NULL 
       END AS VARCHAR) AS 'C' 
    FROM #Register r 
    GROUP BY PersonID 
     ,RegisterID 
     ,Stat 
    ) q 
GROUP BY q.PersonID 
    ,q.RegisterID 

該代碼假定每個人每個狀態有一條記錄。

它輸出

如果狀態值是不固定的，你不知道它們是什麼，你可以使用下面的SQL Server：

CREATE TABLE #Register(PersonID int, RegisterID int, Stat varchar) 

INSERT INTO #Register (PersonID,RegisterID,Stat) VALUES 
('3049518','14467','A'), 
('3049518','14467','B'), 
('3049518','14467','C'), 
('3049518','32445','A'), 
('3049518','32445','B'), 
('3049518','32445','C') 


DECLARE @queryPart1 NVARCHAR(MAX) 
    ,@queryPart2 NVARCHAR(MAX) 
    ,@colHeader NVARCHAR(MAX) 
    ,@query NVARCHAR(MAX) 

SET @queryPart1 = 'SELECT PersonID,RegisterID' 
SET @queryPart2 = 'FROM (SELECT PersonID,RegisterID' 
SET @query = '' 

DECLARE Stat_Cursor CURSOR 
FOR 
SELECT DISTINCT (STAT) 
FROM #Register r 

OPEN Stat_Cursor; 

FETCH NEXT 
FROM Stat_Cursor 
INTO @colHeader 

WHILE @@FETCH_STATUS = 0 
BEGIN 
    SET @queryPart1 = @queryPart1 + ',MAX(''' + @colHeader + ''') ''' + @colHeader + '''' 
    SET @queryPart2 = @queryPart2 + ',CAST(CASE WHEN r.stat = ''' + @colHeader + ''' THEN ''' + @colHeader + ''' ELSE NULL END AS VARCHAR) AS ''' + @colHeader + '''' 

    FETCH NEXT 
    FROM Stat_Cursor 
    INTO @colHeader 
END; 

CLOSE Stat_Cursor; 

DEALLOCATE Stat_Cursor; 

SET @query = @queryPart1 + @queryPart2 + 'FROM #Register r GROUP BY PersonID ,RegisterID,Stat) q' 

PRINT @query 
GO 

Answer 3

這裏是一個如果您使用Oracle的解決方案：

select * from ( 
    select PersonID,RegisterID, Status 
    from test t 
) 
pivot 
(
    count(Status) 
    for Status in ('A' as "Status1",'B' "Status2",'C' "Status3") 
) 
order by 1 

SQLFiddle