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Re: Storing multiple value field in a MySQL database

by FloydATC (Deacon)
on Nov 26, 2013 at 19:58 UTC ( #1064460=note: print w/replies, xml ) Need Help??

in reply to Storing multiple value field in a MySQL database

The whole point of relational databases is to model your data using tables, then join those tables using keys as others have shown. There are so many reasons why you want to do this, here are just a few of them:
  • Sooner or later you will want to define properties for those groups, so you need a table for them anyway
  • Using separate tables you are not limited to asking "what groups is this user member of", you can just as easily ask "what users are member of this group"
  • As the data set grows, storing the group names over and over again is a complete waste
  • What if you want to rename or delete a group at some point in the future
  • What if at some point in the future you want to make the groups hierarchial and then for some reason use the same name in several places
The list just goes on...

Learn proper SQL data modeling right from the start, it will save you SO much extra work.

-- FloydATC

Time flies when you don't know what you're doing

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[Discipulus]: if known where i can read about the matter?
[choroba]: he's not really sick, we just got nobody to look after him today
[Discipulus]: create an account for him; we are funny baby sitters ;=) come here child, want to listen the typeglob tale?
[vrk]: choroba Oh, that's good.
[vrk]: Discipulus I don't know much about prime numbers, but wouldn't that kind of an answer be in a graduate-level number theory book?
[Discipulus]: my 8 yo daughter has two weeks of sleep disturbs.. we are gonna be crazy..
[Discipulus]: vrk i searched but found nothing: after this my math level if terribly low but i like to discuss my discovery with kind mathematicians

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