程序在SQL Server 2005中转换行colums需要一些修正

Question

我使用的是SQL Server 2005和asp.net 2008年用C＃...我有2个表结果和Stud_Info .......

1] Stud_Info 

CREATE TABLE Stud_Info 
(Enroll_Number varchar(20) NOT NULL, 
Salutation varchar(10) NULL, 
First_Name varchar(20) NULL, 
Middle_Name varchar(20) NULL, 
Last_Name varchar(20) NULL, 
Course_Id varchar(20) NULL, 
Batch varchar(20) NULL) 

INSERT into Stud_Info values(11161,'Mr.','Mack','B','Botha','MECH','Batch1');  
INSERT into Stud_Info values(11162,'Mr.','John','A','Los','CIVIL','Batch2');  
INSERT into Stud_Info values(11163,'Ms.','Merry','F','Dsuza','ELCT','Batch1');  
INSERT into Stud_Info values(11164,'Mr.','Pow','B','Janero','MECH','Batch2');  
INSERT into Stud_Info values(11165,'Mr.','Martin','J','Smith','MECH','Batch1');  

SELECT * from Stud_Info 

第二表是这样的...

2] Exam_Result 

CREATE TABLE Exam_Result 
(Result_Id numeric(18, 0) IDENTITY(1,1) NOT NULL, 
Enroll_Number varchar(50) NULL, 
Student_Name varchar(100) NULL, 
Course_Id varchar(50) NULL, 
Semester varchar(50) NULL, 
Subject_Id varchar(50) NULL, 
Subject_Name varchar(50) NULL, 
MarksObtained numeric(18, 0) NULL, 
Exam_Type varchar(50) NULL) 

INSERT into Exam_Result values(11161,'Mack B Botha','MECH',1,'MT','Maths',25,'Internal1'); 
INSERT into Exam_Result values(11161,'Mack B Botha','MECH',1,'EN','English',22,'Internal1'); 
INSERT into Exam_Result values(11161,'Mack B Botha','MECH',1,'SC','Science',20,'Internal1'); 
INSERT into Exam_Result values(11166,'Barden V John','CIVIL',1,'SS','Social',21,'Internal2'); 
INSERT into Exam_Result values(11161,'Mack B Botha','MECH',2,'SM','Simple Maths',24,'Internal2'); 
INSERT into Exam_Result values(11161,'Mack B Botha','MECH',2,'SM','Simple Maths',69,'Final'); 

SELECT * from Exam_Result 

我使用这个存储过程进行动态转换行到列主题......并能正常工作。

Create Proc GetExamResults (@Course_Id varchar(100), @Semester varchar(10)) 
as 
begin 
    declare @subjname varchar(100) 
    declare @subjects varchar(7000) 
    declare @subjectsselection varchar(7000) 
    declare @SumSelection varchar(7000) 
    declare @NoOfSubjects int 
    set @NoOfSubjects = 0 

    set @subjects = '' 
    set @subjectsselection = '' 
    set @SumSelection = '' 

    DECLARE subject_cursor CURSOR 
    FOR SELECT distinct Subject_Name FROM Exam_Result where course_id = @Course_Id And Semester = @Semester 

    OPEN subject_cursor 

    FETCH NEXT FROM subject_cursor 
    INTO @subjname 

    WHILE @@FETCH_STATUS = 0 
    BEGIN 
     set @subjects = @subjects + '[' + @subjname + '],' 
     set @subjectsselection = @subjectsselection + 'Sum(Isnull([' + @subjname + '],0)) As [' + @subjname + '],' 
     set @SumSelection = @SumSelection + 'Sum(Isnull([' + @subjname + '],0))+' 

     set @NoOfSubjects = @NoOfSubjects + 1 

     FETCH NEXT FROM subject_cursor 
     INTO @subjname 
    End 
    CLOSE subject_cursor; 
    DEALLOCATE subject_cursor; 

    select @subjects = LEFT(@subjects, LEN(@subjects) - 1) 
    select @subjectsselection = LEFT(@subjectsselection, LEN(@subjectsselection) - 1) 
    select @SumSelection = LEFT(@SumSelection, LEN(@SumSelection) - 1) 

    print @subjects 
    print @subjectsselection 
    print @SumSelection 

    declare @query nvarchar(4000) 

    set @query = 'select S.Enroll_Number, pvt.Student_Name, pvt.Course_Id, pvt.Semester, ' + @subjectsselection + ',' 
    set @query = @query + 'Exam_Type,' + @SumSelection + ' As Grand_Total, ' 
    set @query = @query + '(' + @SumSelection + ')' + '/' + convert(varchar(10),@NoOfSubjects) + ' As Avg' 
    set @query = @query + ' From ' 
    set @query = @query + '(select Enroll_Number, Student_Name, Course_Id, Semester, Subject_Name, MarksObtained, Exam_Type from Exam_Result) ps ' 
    set @query = @query + ' pivot(sum(MarksObtained) for Subject_Name in (' + @subjects + ')) as pvt' 
    set @query = @query + ' inner join Stud_Info S on S.Enroll_Number = pvt.Enroll_Number ' 
    set @query = @query + ' where pvt.Course_Id = ''' + @Course_Id + ''' and pvt.Semester = ''' + @Semester + '''' 
    set @query = @query + ' group by S.Enroll_Number, pvt.Student_Name, pvt.Course_Id, pvt.Semester, Exam_Type' 
    print @query 
    exec sp_executesql @query 
end 

目前我越来越喜欢O/P ....

Enroll_Number Student_Name Course_Id Semester Maths English Science Social Smathas total avg 

11161   MACK   MECH  1   25  22   20   0   0   67  total/all sub 
11166   Barden  CIV   1   0  0   0   21  0   21  total/all sub 

注意

这里我得到了在Exam_Result表和所有科目所有子的总和（以GE你可以看到 - 67）和AVG从Exam_Result

所有科目

现在的问题是我想显示结果通过摸索按照用户自选....对于例如，如果用户希望只看到COURSE_ID = MECH和 学期= 1 .... O/P应是....

Enroll_No Student_Name Course_ID Semester Maths English Science  Type   Grand_Total Avg 

11161  Mack B Botha  MECH   1   25  22   20  internal1  67   66.22 

没有修复不的科目每门课程和semester..it可能会改变....并需要通过COURSE_ID和学期是组给我指导和查询，所以我会实现你的答案....我希望这个信息就足以说明我的东西....所有answe RS是最欢迎...感谢

Answer 1

回答你这个评论：

它不是在SQL Server 2005的工作为我的网站它给错误消息102，级别15，状态1，不正确的行'ps'附近的语法。传递给SUBSTRING函数和无效长度参数。

执行动态查询时可能会出现第一个错误。我不能肯定，但它看起来好像你的数据库的兼容级别低于90，因此PIVOT不允许/认可。搜索本网站，了解如何在没有PIVOT子句的情况下进行转换以解决问题。或者如果可能的话，将数据库的兼容性级别设置为90。

至于第二个错误，我遇到它也当我是测试您的查询。 （这件事发生时，我没有为这些参数指定的值。）错误的来源是这一行：

select @subjects = LEFT(@subjects, LEN(@subjects) - 1) 

如果光标查询没有返回行，你的@subjects变量保持空LEN(@subjects) - 1结果-1，当其为长度参数传递给LEFT()，产生错误。

只需添加一个条件，以避免该问题：

if LEN(@subjects) > 0 select @subjects = LEFT(@subjects, LEN(@subjects) - 1) 

执行相同的其他两个字符串（@subjectsselection和@SumSelection）。

_{并请，下一次你都在问一个问题，说有什么不工作，请确保你把所有的相关信息（包括错误消息）到你的问题，不到评论。}