On 06/04/2004 15:29 Robert Treat wrote:
Trying to come up with the proper syntax to meet the following criteria:
create table foo (bar integer, baz boolean UNIQUE (bar, baz = true));
note the above syntax is not correct, but should demonstrate what i'm trying to do; I want to add a unique constraint such that we only allow one case of bar and baz = true... i can have unlimited bar and baz = false, and there can be multiple bar and baz = true if the bars are different... did some doc reading and mail list searching but a valid syntax for this seems to be escaping me...
btw I'm pretty sure I could do this with an external trigger, but am wondering about a constraint oriented approach
What about
create table foo (bar integer, baz boolean);
create unique index foo_bar_baz on foo(bar, baz) where baz = true;
--
Paul Thomas
+------------------------------+---------------------------------------------+
| Thomas Micro Systems Limited | Software Solutions for Business |
| Computer Consultants | http://www.thomas-micro-systems-ltd.co.uk |
+------------------------------+---------------------------------------------+
---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ?
http://www.postgresql.org/docs/faqs/FAQ.html
