Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

Re: Storing multiple value field in a MySQL database

by FloydATC (Chaplain)
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


Comment on Re: Storing multiple value field in a MySQL database

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1064460]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others about the Monastery: (5)
As of 2014-10-22 05:16 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    For retirement, I am banking on:










    Results (112 votes), past polls