SQL Server查询显示特定月份或日期之间的汇总列表

Question

我有一个attendance表，其中包含学生的出勤日期和出席状态。

有没有什么办法来显示摘要是这样的：

Student 20-09-2012 21-09-2012 22-09-2012 23-09-2012 
    xyz  P   A   P   P 
    abc  P   P   P   P 

通过SQL Server查询？

我试过用PIVOT，但它不起作用，因为聚合函数。

Answer 1

我试过用PIVOT，但它不起作用，因为聚合 函数。

可以使用MAX作为聚合函数，像这样：

SELECT t.StudentName, 
    MAX(CASE WHEN t.Date = '20120920' THEN t.Status END) AS '20-09-2012', 
    MAX(CASE WHEN t.Date = '20120921' THEN t.Status END) AS '21-09-2012', 
    MAX(CASE WHEN t.Date = '20120922' THEN t.Status END) AS '22-09-2012', 
    MAX(CASE WHEN t.Date = '20120923' THEN t.Status END) AS '23-09-2012' 
FROM Attendence t 
GROUP BY t.StudentName 

Answer 2

你的问题让我想起了一个相似的，我不得不解决的。使用动态SQL您的问题解决了如下

-- create list of all dates 
DECLARE @dates varchar(1000) = '' 
SELECT @dates = @dates + ',[' + CAST(t.[date] as varchar)+']' 
FROM (SELECT DISTINCT [date] FROM Attendance) t 

-- remove first comma 
IF LEN(@dates)>1 SET @dates = RIGHT(@dates,LEN(@dates)-1) 


-- create query with UNPIVOT and PIVOT 
exec('SELECT 
     StudentName,'+ 
     @dates+ 
    'FROM(
     SELECT 
      [date], 
      [stat], 
      StudentName 
     FROM 
      (SELECT 
        [date], 
        [status], 
        StudentName 
       FROM 
        Attendance 
      ) AS t 
     UNPIVOT 
      (stat FOR s in ([status])) unpvt 
     ) dummy 
    PIVOT 
     (
      MAX(stat) FOR [date] in ('+@dates+') 
     ) pvt 
    ORDER BY StudentName;'); 

也就是说SqlFiddle您的要求

Answer 3

DECLARE @DynamicPivotQuery AS NVARCHAR(max) 
DECLARE @ColumnName AS NVARCHAR(max) 

SELECT a.grno, 
     a.a_date [Date], 
     a.status, 
     s.first_name, 
     s.last_name 
INTO #pivotdata 
FROM attendance_master AS a, 
     student_master AS s 
WHERE sid = " & dd_sub.selecteditem.value & " 
     AND s.grno = a.grno 
     AND a.a_date >= '" & txtdate1.Text & "' 
     AND a.a_date <= '" & txtdate2.Text & "' 
GROUP BY a.grno, 
      a.status, 
      a.a_date, 
      s.last_name, 
      s.first_name 

SELECT @ColumnName = Isnull(@ColumnName + ',', '') 
        + Quotename([date]) 
FROM (SELECT DISTINCT [date] 
     FROM #pivotdata) AS Dates 

SET @DynamicPivotQuery = 'SELECT grno,first_name,last_name,' 
         + @ColumnName 
         + 'FROM #PivotData PIVOT(sum(status) FOR [Date] IN (' 
         + @ColumnName + ')) AS PVTTable1' 

EXEC Sp_executesql 
    @DynamicPivotQuery