| From: | Nick Haw <nick(dot)haw(at)operagrp(dot)com> |
|---|---|
| To: | "'pgsql-general(at)postgresql(dot)org'" <pgsql-general(at)postgresql(dot)org>, "'pgsql-novice(at)postgresql(dot)org'" <pgsql-novice(at)postgresql(dot)org>, "'pgsql-novice(at)postgresql(dot)org'" <pgsql-novice(at)postgresql(dot)org>, "'pgsql-novice(at)postgresql(dot)org'" <pgsql-novice(at)postgresql(dot)org> |
| Subject: | Conditional constraint? |
| Date: | 2002-03-08 17:06:57 |
| Message-ID: | 71F468541618D3118DDF204C4F4F50204B1EC9@ThisAddressDoesNotExist |
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| Thread: | |
| Lists: | pgsql-general pgsql-novice |
Hi there, I have a problem that I can't fathom out.
What I want to do is make a field so that it requires a value after a change
in another field to a particular value. Is this possible with the ADD
CONSTRAINT command, or will I have to make a custom function and use a
trigger.
Many thanks
Nick
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