This week's book giveaway is in the Clojure forum.
We're giving away four copies of Clojure in Action and have Amit Rathore and Francis Avila on-line!
See this thread for details.
Win a copy of Clojure in Action this week in the Clojure forum!
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

SQL check constraint

 
Juhan Voolaid
Ranch Hand
Posts: 179
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi

It is only about SQL (DDL) and to be more specific - about PostgreSQL.

I have to create a table coordinates with rows: x integer, y integer, id integer, data_set integer. And I allso must specify that in one data_set, there is no dublicated set of coordinates.

My first attempt was like that:

But this one fails, because it does not care about data_set_ID.

So if there is any SQL guru out there, help is very welcome. How would you complete this, or what would you add to the code above?


thanx
[ June 11, 2006: Message edited by: Juhan Voolaid ]
 
Juhan Voolaid
Ranch Hand
Posts: 179
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Daaaahhhh ...

The solution is more simple than I could excpect in my wildest dreams:

UNIQUE (x, y, data_set_id)
 
Jeanne Boyarsky
author & internet detective
Marshal
Posts: 33694
316
Eclipse IDE Java VI Editor
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Juhan,
Thanks for posting the solution for others who see this thread in the future.
 
I agree. Here's the link: http://aspose.com/file-tools
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic