Question

我正在使用SQL Server 2012和VS 2012 C＃我设计了数据库表Roll_No，Attend_Date，Attend_Status 同时存储我存储的数据

______________________________________
Roll_No Attend_Date Attend_Status
---------------------------------------
1   04-01-14    1
2   04-01-14    1
3   04-01-14    1
1   05-01-14    0
2   05-01-14    1
3   05-01-14    0
1   06-01-14    1
2   06-01-14    1
3   06-01-14    1
----------------------------------------

但我必须像这样在网格视图中显示

__________________________________________________________________
Roll_No 04-01-14    05-01-14    06-01-14    07-01-14
-------------------------------------------------------------------
1   1              0              1             1
2   1              1              1             1
3   1              0              1             1
-------------------------------------------------------------------

你能帮帮我吗？我怎样才能达到这个结果..

Answer 1

您可以通过在执行PIVOT时将每个日期列为列名称或使用动态SQL生成列列表然后应用PIVOT来执行此操作。

PIVOT is used to change row data to columns

create table #attendance (rollno int,attend_date varchar(30),attend_status int)
insert into #attendance values(1,'04-01-14',1)
insert into #attendance values(2,'04-01-14',1)
insert into #attendance values(3,'04-01-14',0)
insert into #attendance values(1,'05-01-14',1)
insert into #attendance values(2,'05-01-14',0)
insert into #attendance values(3,'05-01-14',1)
insert into #attendance values(1,'06-01-14',1)
insert into #attendance values(2,'06-01-14',1)
insert into #attendance values(3,'06-01-14',0)

Declare @colList varchar(max)
Declare @qry varchar(max)

SET @colList = STUFF((SELECT distinct ',' + QUOTENAME(c.Attend_Date) 
            FROM #attendance c
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

SET @qry = 'SELECT rollno,'+@colList+'
FROM (
    SELECT Rollno,attend_date,attend_status

    FROM #attendance
) as s
PIVOT
(
    MAX(Attend_Status)
    FOR Attend_Date IN (' + @colList + ')
) pvt '

EXEC(@qry)

drop table #attendance

<强>输出

Rollno  04-01-14  05-01-14  06-01-14
1             1      1       1
2             1      0       1
3             0      1       0

现在您可以在GridView中找到此结果集

如何使用SQL和Gridview显示gridview中的学生出勤率

1 个答案: