no -
-- is line comment in SQL - it same like // in C++
sorry didn't see this was updated. I know -- is a comment
I mean in sql means NOT your function name is emptystr which
implies it looks for an emptystr and returns true if the string is
found to be empty (at least in my mind). so if you
2009/12/7 Caleb Cushing xenoterrac...@gmail.com:
no -
-- is line comment in SQL - it same like // in C++
sorry didn't see this was updated. I know -- is a comment
I mean in sql means NOT your function name is emptystr which
implies it looks for an emptystr and returns true if the string
So last time I checked this wasn't possible (at least not that anyone
has told me). I'd like to be able to create constraints that aren't
tied to a specific table/column.
I think that the syntax would look something like this
CREATE CONSTRAINT empty CHECK (VALUE = '\0' );
this should allow us
Hello
do you know domains? It is very similar to your proposal.
http://www.postgresql.org/docs/8.2/static/sql-createdomain.html
Regards
Pavel Stehule
2009/11/23 Caleb Cushing xenoterrac...@gmail.com:
So last time I checked this wasn't possible (at least not that anyone
has told me). I'd like
On Mon, Nov 23, 2009 at 4:17 AM, Pavel Stehule pavel.steh...@gmail.com wrote:
Hello
do you know domains? It is very similar to your proposal.
obviously since I cited it.
constraint cannot be part of expression.
why not? NOT NULL is a contraint, UNIQUE is a contstraint.
CREATE OR
2009/11/23 Caleb Cushing xenoterrac...@gmail.com:
On Mon, Nov 23, 2009 at 4:17 AM, Pavel Stehule pavel.steh...@gmail.com
wrote:
Hello
do you know domains? It is very similar to your proposal.
obviously since I cited it.
constraint cannot be part of expression.
why not? NOT NULL is a
On mån, 2009-11-23 at 12:50 -0500, Caleb Cushing wrote:
and domains
only seem right if it's something, like a zip code, that has a very
specific set of rules, that is in reality it's own type.
A domain is not really its own type, it's a domain over its base type.
Hence the name.
where
CREATE OR REPLACE FUNCTION emptystr(text)
RETURNS bool AS $$
SELECT $1 ''; -- it is SQL not C
$$ LANGUAGE sql;
CREATE TABLE users(
username TEXT CHECK (NOT emptystr(username)),
although I'm not going to continue discussing the request. this code
as the opposite desired effect. it should
Caleb,
I can understand why you want this. However, it would be tricky to
implement because of data typing, and is fairly easily worked around
using either domains or functions. So I don't think anyone is going to
want to add it to the TODO list, sorry.
Of course, Postgres is fully hackable if
2009/11/24 Caleb Cushing xenoterrac...@gmail.com:
CREATE OR REPLACE FUNCTION emptystr(text)
RETURNS bool AS $$
SELECT $1 ''; -- it is SQL not C
$$ LANGUAGE sql;
CREATE TABLE users(
username TEXT CHECK (NOT emptystr(username)),
although I'm not going to continue discussing the request.
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