On Mon, 19 Feb 2001, Chris Aitken wrote:
> Hi Everyone.
>
> Just a quick question I worked out once before on my lonseome and the mysql
> manual, but it was longer ago than yesterday and it a blur how I did it.
>
> What I need to do is..... I have a table, and in that table there are
> several fields which need to be unique. What do I need to do to make other
> fields within a table so that it rejects any duplicates.
>
> If for instance, I have a field called 'job_number' in a table called
> 'jobs' and it is 'varchar(50)' and I want to make it so that no duplicates
> are allowed, what command should I issue ?
>
You can add UNIQUE INDEX to the columns.
create UNIQUE INDEX job_number_idx on jobs (jobs_number(10));
For CHAR and VARCHAR columns, indexes can be created that use only part of
a column, using col_name(length) syntax.
Or make the column primary key. see the documentation 8-)).
--ilham--
>
> Thanks
>
>
> Chris
>
>
> ---------------------------------------------------------------------
> Before posting, please check:
> http://www.mysql.com/manual.php (the manual)
> http://lists.mysql.com/ (the list archive)
>
> To request this thread, e-mail <[EMAIL PROTECTED]>
> To unsubscribe, e-mail
><[EMAIL PROTECTED]>
> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
>
---------------------------------------------------------------------
Before posting, please check:
http://www.mysql.com/manual.php (the manual)
http://lists.mysql.com/ (the list archive)
To request this thread, e-mail <[EMAIL PROTECTED]>
To unsubscribe, e-mail <[EMAIL PROTECTED]>
Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
