check column values in sql server table compare them and insert in different table

Question

0.00/5 (No votes)

See more:

SQL-Server-2012

I have two tables in my database

(Prefrences_Table)

--------------------------
|student | Preferences |
--------------------------
Stud A   |  Stud B  
Stud A   |  Stud C
Stud B   |  Stud E
Stud B   |  Stud A
Stud C   |  Stud F
Stud F   |  Stud B
--------------------------

(Prefrences_Table)

--------------------------
    |student | Group ID/Name |
    --------------------------
    Stud A   |    
    Stud B   |  
    Stud C   |  
    Stud D   |  
    Stud E   |  
    Stud F   |  
    --------------------------

I am asking each student to give me maximum 7 names, who they want to team up with. then taking this information in account fulfill as many choices as possible and create a team.

These are the rules i have to follow to create teams.

First i will check if "Stud A" has added "Stud B" in his Preferences list, and "stud B" has also added "stud A" in his preference, if both of them have added each other i want to add them in group/team (Do this for all students). Second, Check for one sided preferences, "Stud A" has added "Stud B" in his Preferences but stud B hasn't, and add them in group. Third add all students without preference to random Groups. Each group/team can have 5-8 students.

I can use select t.student, t1.student from Prefrences_Table t inner join Prefrences_Table t1 on t.student = t1.preferences and t.preferences = t1.student and t.student < t1.student to find mutual preferences.

How do i create group numbers and than insert them in student table checking that minimum 5 and maximum 8 students have this id.

Groups are going to be created by clicking a button in the application

Posted 7-Oct-13 9:33am

Mubshir

Updated 7-Oct-13 10:15am

v3

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

W∴ Balboos, *GHB* · Accepted Answer · 2013-10-07T09:51:00

You need to create a set of rules as to how you will create groups (you need some sort of priority for the guaranteed overlaps of group members).

You can create a VIEW giving the count of selections for each students and (perhaps) order by count, descending, giving you a list to start from. You can take this further by making the view the result of an INNER JOIN that links students who select one another (but that will omit those not part of the group - so think UNION to get those on the list, too).

Now, you create a table linking students and a group number or name (something I guess you don't yet have defined).

When you create a group, you can use it in a SUBQUERY to remove references to those students from your VIEW (the subquery should, obviously, be part of your view). You are using the subquery to remove students already in groups.

When you run out of large-enough groups, you'll need a rule for using members of too-small groups and singletons.

Having a rule-set, however, is essential: you need some sort of clarity in how to start making your groups and how to handle conflicts and other exceptions.