Question

我得到类似的东西：

MachID  DownCode    DownTime
PR01    COMP                    30.83
PR02    DIE SET                 378.205277777778
PR02    Die Wait                88.0533333333333
PR03    ColorChg                8.54194444444444
PR04    DieStart                0.205277777777778

来自查询：

SELECT MachID, DownCode, SUM(EndTime - StartTime)/3600 AS DownTime 
FROM vReportDownLog
GROUP BY MachID, DownCode

但我真的想要这样的东西：

MachID ColorChg COMP DIE SET DieStart Die Wait
PR01   0        30.83
PR02   0        0    378.205 0        88.0533
PR03   8.5419   0    0       0        0
PR04   0        0    0       0.2052   0

以这种方式使用Google Visualization数据会更容易。

基本上，我希望第一个GROUP BY列作为左列，第二个GROUP BY列作为列标题，它们之间的数值，就像通常的表一样。

经过一番努力，我得到了动态SQL的修改版本：

BEGIN TRANSACTION

DECLARE @UsePivot as VARCHAR(MAX)
DECLARE @sql VARCHAR(MAX)

-- clever way of concatenating the rows of that column
-- just a little bit cleaner than using a cursor
-- and probably faster, too. Requires I think SQL 2008+
SELECT @UsePivot =
STUFF((
    SELECT DISTINCT ',[' + DownCode + ']'
    FROM DownCodes
    FOR XML PATH('')
), 1, 1, '' )

SET @sql = '
SELECT MachID, ' + @UsePivot + '  FROM
(
    SELECT MachID, DownCode, SUM(CAST(EndTime AS Float) - CAST(StartTime AS Float))/3600 AS DownTime
    FROM vReportDownLog
    GROUP BY
    MachID, DownCode
) TBL
PIVOT
(
    SUM(DownTime)
    FOR DownCode IN (' + @UsePivot + ')
)
AS Pvt'

EXEC (@sql)

ROLLBACK

Answer 1

使用PIVOT：http://technet.microsoft.com/en-us/library/ms177410(v=sql.105).aspx

begin transaction

declare @UsePivot as varchar(max)
declare @sql as varchar(max)
declare @downcode as varchar(100)


DECLARE rcursor CURSOR
    FOR SELECT DownCode FROM DownCodes
OPEN rcursor
FETCH NEXT FROM rcursor
INTO @downcode

WHILE @@FETCH_STATUS = 0
BEGIN

Set @UsePivot = isnull(@UsePivot,'') + '[' + LTRIM(RTRIM(@downcode)) + '],'

FETCH NEXT FROM rcursor
INTO @downcode

END 
CLOSE rcursor;
DEALLOCATE rcursor;

---Remove last comma
Set @UsePivot = SUBSTRING(@UsePivot,1,len(@UsePivot)-1)

SET @sql = '(SELECT MachID, (EndTime - StartTime)/3600 as [DownTime], ' + @UsePivot + ' as [totals] FROM vReportDownLog) as TBL '
+ 'PIVOT (SUM(DownTime) for DownCode in (' + @UsePivot + ')) as Pvt Group by MachID'


exec @sql

rollback

我做了一个动态查询，以匹配表中所有事件的下行代码。

Answer 2

select * from table pivot (sum(downtime) for downcode in
(COMP,
[DIE SET],
[Die Wait],
ColorChg,
DieStart) )as pvt

如何选择每个GROUP BY项作为单独的列？

2 个答案: