Sql server 2005 如何使用PIVOT在SQLServer2005的动态列中声明变量

我已经退房了，但是我迷路了

由于某些原因，我无法声明要在以下动态列SQL代码中使用的@wsDateFrom&@wsDateTo变量

DECLARE @cols AS NVARCHAR(MAX),
        @query AS NVARCHAR(MAX)

DECLARE @wsDateFrom AS smalldatetime
DECLARE @wsDateTo   AS smalldatetime

SET @wsDateFrom = '01-JAN-2015'
SET @wsDateTo   = '30-JUN-2015'

select @cols = STUFF((SELECT DISTINCT ',' + QUOTENAME(a.AbsenceDescription) 
                      FROM dbo.tblAbsentCodes AS a
                      FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,'')

set @query = N'SELECT StudentID, ' + @cols + 
             'FROM  (SELECT a.StudentID, ab.AbsenceDescription, a.AttendanceID
                     FROM   dbo.tblAttendance AS a
                        INNER JOIN tblCalendar c 
                            ON a.DateID = c.DateID
                        INNER JOIN tblAbsentCodes as ab
                            ON ab.AbsenceID = a.AbsenceID
                     WHERE c.DayDate BETWEEN @wsDateFrom AND @wsDateTo) AS p
              PIVOT (COUNT(AttendanceID) FOR AbsenceDescription IN (' + @cols + ')) AS pvt '

execute(@query)

我得到的错误是

必须声明标量变量“@wsDateFrom”

但它就在那里！或者我应该把DECLARE放在@query中吗

如果是这种情况，那么如何在函数或存储过程中传递这两个日期变量？它会为sql注入打开它，不是吗？

不，它不在那里。 试试这个：

DECLARE @cols AS NVARCHAR(MAX),
        @query AS NVARCHAR(MAX)

DECLARE @wsDateFrom AS smalldatetime
DECLARE @wsDateTo   AS smalldatetime

SET @wsDateFrom = '01-JAN-2015'
SET @wsDateTo   = '30-JUN-2015'

select @cols = STUFF((SELECT DISTINCT ',' + QUOTENAME(a.AbsenceDescription) 
                      FROM dbo.tblAbsentCodes AS a
                      FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,'')

set @query = N'SELECT StudentID, ' + @cols + 
             'FROM  (SELECT a.StudentID, ab.AbsenceDescription, a.AttendanceID
                     FROM   dbo.tblAttendance AS a
                        INNER JOIN tblCalendar c 
                            ON a.DateID = c.DateID
                        INNER JOIN tblAbsentCodes as ab
                            ON ab.AbsenceID = a.AbsenceID
                     WHERE c.DayDate BETWEEN ' + @wsDateFrom + 'AND ' + @wsDateTo + ' ) AS p
              PIVOT (COUNT(AttendanceID) FOR AbsenceDescription IN (' + @cols + ')) AS pvt '

execute(@query)

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使用sp_executesql并传递参数in@MitchWheat你是什么意思？我应该在哪里调用“sp_executesql”？此外，我还必须像上面那样声明参数。