query for a crosstable(from 3 tables into gridview)

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I have 3 tables in my db: STUDENT, BOOK and GRADE. Book table has the result column, Each student take few book. In Grade table there is a column named average (average of results for book of student). Is it possible to show in Datagridview a cross table where each row refer to a student and each column refer to a book result and one column for average?

Posted 2-Mar-11 15:34pm

siaswar

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Not Active · Answer 1 · 2011-03-02T16:12:00

Solution 1

You mean something like this?

SELECT TABLE1.COL, TABLE2.COL, TABLE3.COL
FROM TABLE1
JOIN TABLE2 ON TABLE1.ID = TABLE2.ID
JOIN TABLE3 ON TABLE1.ID = TABLE3.ID

Posted 2-Mar-11 16:12pm

Not Active

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siaswar 4-Mar-11 6:23am

No. This is Join and I know it. Each row in student has many rows in book. I want a table that shows student_name in row_header and book_name in column header and result in cross.
==>student table:
st_name nvarchar(20);
st_family nvarchar(30);
class_id int;

==>book table:
book_name nvarchar(30),
st_id int,
result single,

I want to show somthing like this:
-------------------------------------------
student| math | english | Geo | ...
-------------------------------------------
John | 35 | 67.5 | 79 | ...
Mark | 89.25| 75 | 92 | ...
Sam | 68 | 74 | 69 | ...
----------------------------------------
So each row in my table comes from student table and each column comes from book table

[no name] 4-Mar-11 8:22am

Yes, that explains it better. I believe what you want is a PIVOT, http://msdn.microsoft.com/en-us/library/ms177410.aspx