From: | "Shashank Tripathi" <shanx(at)shanx(dot)com> |
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To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Checking for string data that makes sense Re: postgresql vs mysql |
Date: | 2007-02-22 08:27:11 |
Message-ID: | 7cab9c1b0702220027j7d8360b9g8e2ac9aa09745bc0@mail.gmail.com |
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Lists: | pgsql-general |
> I would do a CHECK (trim(a) <> '')
TRIM() would add some processing time, so I'd include it only if there
was a chance of spaces getting added. From a puritanical point of
view, it is definitely a good idea.
To the original poster, this syntax should work in MySQL as well:
create table mytable (mycol text not null check (mycol <> ''));
Problem is, if you created your table before MySQL 5, and now simply
want to ALTER your table (which is what I gather you wish to do, as
you already have the table) then adding the CHECK condition may not
work.
I cannot help in this case, and from the turn this thread has taken,
not many others I suppose. Why not try a MySQL experts list instead of
PostgreSQL, but be prepared to have to recreate the table in MySQL 5
with the CHECK constraint, and then importing your data in to it.
Good luck!
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