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12.07.2007 at 07:55AM PST, ID: 23008905
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5.8

MySQL Query Question - generate a random winner from list of contestants with varying number of entries

Asked by jameswalt in MySQL Server

Tags: , , ,

I have a database of members. Each member has 0 or more entries into a contest, and each day a member can use up to 10 entries to win a prize. I need to generate a random winner from the database using the spread of entries that each member contains.

Here's how I began to approach this problem:
SELECT Sum(IF(entriesremaining>10,10, entriesRemaining)) AS numberOfEntries FROM members

The above query returns the number of entries to be used in today's drawing. Next, I want to choose a random number between 1 and [numberOfEntries]. The problem I have is figuring out which part of the spread this random number belongs to.

I want to start the new query with something like this:
SELECT * FROM members WHERE {this member's entry is the winning random number}

Here's a logicial example:
James has 5 entries
Kelly has 7 entries
Josh has 15 entries

The total number of entries used today is 22 (5+7+10). The random number chosen is 9. James has tickets 1-5, Kelly has tickets 6-12, and Josh has 13-22. Therefore, Kelly wins today's contest.

What kind of query could efficiently figure this out?
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Keywords: MySQL Query Question - generate a r…
Title
1 And the winner is ...
2 July Winners?
3 Answer & Win! drawings Grand Priz…
4 Winner or not???
5 winners
6 LOTTERY AWARD WINNER 2005
 
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About this solution

Zone: MySQL Server
Tags: mysql, random, from, query
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Solution Provided By: blckholehorizon
Participating Experts: 2
Solution Grade: B
 
 
 
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