Re: Field Constraints - Mailing list pgsql-general

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Subject Re: Field Constraints
Date
Msg-id 001501c1ca9e$0bd29c40$05faa8c0@edios
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In response to Field Constraints  (Joseph Maxwell <jemaxwell@jaymax.com>)
List pgsql-general
CHECK ("Prior_Rx"  ~ '[Yy][Ee][Ss]$|[Nn][Oo]$');

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----- Original Message -----
From: "Joseph Maxwell" <jemaxwell@jaymax.com>
To: <pgsql-general@postgresql.org>
Sent: Wednesday, March 06, 2002 9:47 PM
Subject: [GENERAL] Field Constraints


> Hello,
> I have created a DB and TABLE but would like to constrain one field to
> accept either "YES" or "NO" only. How can I set this up?
> I have tried various syntactic constructs of
>
>      Prior_Rx              varchar(3) NULL CHECK ('Yes', 'No'),
>      Prior_Rx              varchar(3) NULL CHECK (VALUE 'Yes', 'No'),
>      Prior_Rx              varchar(3) NULL CHECK ('Yes', 'No'),
>      Prior_Rx              varchar(3) NULL CONSTRAINT (CHECK (VALUE
> 'Yes', 'No')),
>      Prior_Rx              varchar(3) NULL CONSTRAINT (CHECK ('Yes',
> 'No')),
>      Prior_Rx              varchar(3) NULL CONSTRAINT (CHECK (VALUE Yes,
> No)),
>      Prior_Rx              varchar(3) NULL CONSTRAINT (CHECK (Yes, No)),
>
>      Prior_Rx              varchar(3) NULL CONSTRAINT (CHECK (Yes OR
> No)),
>      Prior_Rx              varchar(3) NULL CHECK (Yes OR No),
>      Prior_Rx              varchar(3) NULL CHECK ('Yes' OR 'No'),
>
> Obviously they were all wrong, could someone advise?
> Thanks
>
> --  Joe  --
>
PS--------------------------------------------------------------------------
-------------
>
> Just learned that the datatype should be 'bool' in this case
>
>      haven't tested it yet
>
> But had I wanted to restrict it to say either mike or john, or even one
> of a list say, 'tea', 'cofee', 'chocolate' or 'espresso', how should
> that be constructed?
>
>
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