Re: Field Constraints

CHECK ("Prior_Rx" ~ '[Yy][Ee][Ss]$|[Nn][Oo]$');

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----- Original Message -----
From: "Joseph Maxwell" <jemaxwell(at)jaymax(dot)com>
To: <pgsql-general(at)postgresql(dot)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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