Re: How do I create a check constraint that is based on age difference?

Hi all,

I found the answer to this myself after much frustration. The manual pages
aren't much help in this regard unfortunately.

create table foo (name varchar(40), dob date check(date_ge(date 'now' -i
nterval '28 years', dob)));

Using an 'interval' time type works perfectly.

Regards and best wishes,

Justin Clift
Database Administrator

On Fri, 5 Jan 2001 16:37, Justin wrote:
> Hi all,
>
> How do I create a 'check' constraint on a date column, so that it will only
> accept dates of at least 28 years ago from the date of entry? For example,
> only allowing dates of birth of people who are older than 28.
>
> i.e.
>
> create table foo (name varchar(40), dob date check(date('dob') < date('now'
> - 28 years)));
>
> This doesn't work. I don't understand how to do addition, subtraction, etc
> with date fields.
>
> Regards and best wishes,
>
> Justin Clift
> Database Administrator