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Home -> Community -> Mailing Lists -> Oracle-L -> An Interesting Grouping Question
Given the following Table
emplid course_id
------ ---------
1 1
2 2
2 3
3 3
3 4
3 5
4 3
4 4
4 5
5 2
5 3
6 1
7 2
8 3
8 4
--------------------------------------------------------------------------------------------
What statement would you write to group employees by the set of courses they have
taken. In otherwords each employee in a group must have taken the same as the others
in the group, not one class more nor less. In this example the employees making up
the groups would be
1,6 2,5 3,4
I had this posed by one of my developers. He had also come up with a solution which didn't take a relational approach. The approach is not exotic, and I suspect it will be proposed by many people. He'd like a relational one.
Ian MacGregor
Stanford Linear Accelerator Center
ian_at_slac.stanford.edu
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Author: MacGregor, Ian A.
INET: ian_at_SLAC.Stanford.EDU
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