At 00:22 29/09/00 -0400, Tom Lane wrote:
>
>Quite aside from implementation shortcomings, there are some big
>definitional issues with subselects in constraints --- just exactly
>what are they constraining? See past discussions in the archives.
>
I've done a search for 'select constraint', with no obvious matches. My
naieve approach would be that a CHECK constraint should evaluate 'true'
assuming the data change was commited/applied (depending on evaluation
time). The CHECK is evaluated like an AFTER <action> trigger.
I presume I am missing something...
----------------------------------------------------------------
Philip Warner | __---_____
Albatross Consulting Pty. Ltd. |----/ - \
(A.B.N. 75 008 659 498) | /(@) ______---_
Tel: (+61) 0500 83 82 81 | _________ \
Fax: (+61) 0500 83 82 82 | ___________ |
Http://www.rhyme.com.au | / \|
| --________--
PGP key available upon request, | /
and from pgp5.ai.mit.edu:11371 |/
