Well I know how factorials explode... I just want to know if its possible to create the specific update trigger?
-Panos
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Using Math in MySQL Triggers
I have two tables:
1. FRIEND
2. MATCH_MY_FRIENDS
FRIEND is a simple table that captures some general attributes about my friends.
MATCH_MY_FRIENDS is a table with every possible combination of my friends (factorially).
I would like it that every time a record is added to 'FRIEND' a trigger is launched that updates the 'MATCH_MY_FRIENDS' table accordingly using factorial math. So here is an example:
I started with 4 friends. The MATCH_MY_FRIENDS table has 24 records in representing 4! (four factorial).
Now I add a record, so I have 5 friends. So I need an update trigger that autmatically inserts an additional 96 records.
I need the trigger to automatically generate the result of the 4! to 5! transformation.
Can this be done in MySQL?
-Panos
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Answers
http://dev.mysql.com/doc/r
in the trigger, you would need to put 2 inserts:
* insert all existing rows in FRIEND with the new FRIEND
* insert all existing rows with new FRIEND and existing FRIEND
what is the exact table structure?
just to give you an idea of how big 60! is:
http://www.google.lu/searc
10! is already over 3 million rows...
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by: angelIIIPosted on 2006-08-06 at 23:17:43ID: 17261614
you should NOT try to match every FRIEND record to all other FRIEND records by default, as this will explose your table.
only insert those rows that really ARE friends.
just try to calculate 60! to quickly see that it won't fit any database, but you will probably have more than 60 records stored in FRIEND table...