RE: An Interesting Grouping Question

From: MacGregor, Ian A. <ian_at_SLAC.Stanford.EDU>
Date: Thu, 30 Aug 2001 13:33:38 -0700
Message-ID: <F001.0037E245.20010830132415@fatcity.com>

That's correct.

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_SLAC.Stanford.edu

-----Original Message-----
Sent: Thursday, August 30, 2001 12:54 PM To: Multiple recipients of list ORACLE-L

Ian;
Are you saying that if employees 1 and 2 took course 1,2,and 3 but employee 3 only took course 1 and 2 then you would want to see 2 groups:

group 1: Employees 1 and 2 (took courses 1, 2, and 3) Group 2: Employee 3 (took course 1, and 2)

Kevin

-----Original Message-----
Sent: Thursday, August 30, 2001 1:48 PM
To: Multiple recipients of list ORACLE-L

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

7
and 8

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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Author: Kevin Lange
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