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PHP/MySQL query checking for more precise LIKE searches

Posted on 2014-10-27
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Last Modified: 2014-11-11
I have a database I'm trying to cross reference for duplicates.

The members table has a list of entries where it's stored with a Members row with each ID comma separated.

So it could be Members: 271,612,614,6600,1102

If I do a duplicates report it is set to take each record and break it up searching on each entry, however since I have the query doing a search such as
SELECT * FROM `Group` WHERE `Members` LIKE '%$memberquery%'

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of course if Member ID 660 is looked up it'll also see Member 6600.
Could there be an easier way to Query it or should I do something like a strlen($meberquery) to then discard if it's irrelevant?
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Question by:kiwistag
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by:Gary
Gary earned 425 total points
ID: 40406770
What does $memberquery consist of?

You would better using IN rather than LIKE

... IN (271,612,614,6600,1102)
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by:Brian Tao
Brian Tao earned 75 total points
ID: 40406786
Well, the table structure will eventually cause you performance issue.
if you can redesign your tables to a group table with a group ID and then another table, e.g. group_member (a 1-to-n relation), then you'd be able to run a query against the group_member table using something like
SELECT * FROM group_member WHERE member='$memberquery'

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If you cannot redesign/rebuild your table and can live with the performance, you can reformulate the query like the following:
SELECT * FROM Group WHERE CONCAT(',', Members, ',') LIKE '%,$memberquery,%'

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Accepted Solution

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Gary earned 425 total points
ID: 40406859
SELECT *
FROM `Group` 
WHERE FIND_IN_SET ($memberquery,Members)

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Author Comment

by:kiwistag
ID: 40436547
taoyipai:
The group has it's own GroupID Column (which is a Primary Key).
The Table consists of: GroupID, GroupLeader, Members, and some other info.

Gary: Thanks for that - I'll give it a shot (the IN and the Find_In_Set).

I'll close and accept the answers as the project has wound down for the year now and will be approached later next year.
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