Как отобразить данные по столбцам

Question

Как отобразить дату по столбцам мудрой

Table1

ID Date Value 

001 01/01/2012 100 
001 02/01/2012 200 
... 
... 
001 31/01/2012 250 
002 01/01/2012 050 
002 02/01/2012 100 
... 
002 31/01/2012 075 
.... 

Я хочу, чтобы отобразить строку значения по дате мудрой группы строк по идентификатору RIW

Ожидаемый результат

ID 01/01/2012 02/01/2012 ... 31/01/2012 

001 100 200 .... 250 
002 050 100 .... 075 
..... 

Как это сделать с SQL-запросом?

Answer 1

Попробуйте

DECLARE @cols NVARCHAR(2000) 
DECLARE @query NVARCHAR(4000) 

SELECT @cols = STUFF((SELECT DISTINCT 
           '],[' + `Date` 
         FROM Table1 
         ORDER BY '],[' + `Date` FOR XML PATH('') 
        ), 1, 2, '') + ']'; 


SET @query = N'SELECT ID, '+ 
@cols +' 
FROM 
(SELECT ID 
FROM Table1 
PIVOT 
(
SUM([`Value`]) 
FOR `Date` IN 
('+ 
@cols +') 
) AS pvt 
ORDER BY ID;' 


EXECUTE(@query) 

SQL2000 версия

DECLARE @date Date,@sql nvarchar(MAX) 
DECLARE date_cursor CURSOR 
    FOR SELECT DISTINCT [Date] FROM table_one ORDER BY [Date] 
    SET @sql = '' 
    OPEN date_cursor 
    FETCH NEXT FROM date_cursor INTO @date 
    WHILE @@FETCH_STATUS = 0 
    BEGIN 
     SET @sql = @sql+ ',MAX(CASE CONVERT(nvarchar(10),[Date],103) WHEN '''+CONVERT(nvarchar(10),@date,103)+''' THEN [Value] END) AS ['+CONVERT(nvarchar(10),@date,103)+']' 
     FETCH NEXT FROM date_cursor INTO @date 
    END 
CLOSE date_cursor 
DEALLOCATE date_cursor 

EXEC('SELECT ID'+@sql+' FROM table_one GROUP BY ID') 

Или

DECLARE @loop int,@date Date,@sql nvarchar(4000) 
DECLARE @TempTable TABLE 
(
    [Date] DATE 
) 
INSERT INTO @TempTable SELECT DISTINCT [Date] FROM table1 ORDER BY [Date] 
    SET @sql = '' 
    SET @loop = 1 
    WHILE (@loop<=31) 
    BEGIN 
     IF EXISTS(SELECT * FROM @TempTable WHERE DAY([Date])=@loop) 
     BEGIN 
      SET @date = (SELECT [Date] FROM @TempTable WHERE DAY([Date])=@loop) 
      SET @sql = @sql+ ',MAX(CASE CONVERT(nvarchar(10),[Date],103) WHEN '''+CONVERT(nvarchar(10),@date,103)+''' THEN [Value] END) AS [DATE'+CONVERT(nvarchar(2),@loop)+']' 
     END 
     ELSE 
      SET @sql = @sql+ ', NULL AS [DATE'+CONVERT(nvarchar(2),@loop)+']' 
     SET @loop = @loop+1 
    END 

EXEC('SELECT ID'+@sql+' FROM table1 GROUP BY ID')