Re: repost of how to do select in a constraint

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От Peter Gibbs
Тема Re: repost of how to do select in a constraint
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Msg-id 000f01c2c1dd$2362b5c0$0b01010a@emkel.co.za
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Ответ на Re: repost of how to do select in a constraint  (Dennis Gearon <gearond@cvc.net>)
Ответы Re: repost of how to do select in a constraint  (Dennis Gearon <gearond@cvc.net>)
Список pgsql-general
Dennis Gearon wrote:

> Can I reference a function in a column check constraint, when the function
doesn't yet exist,
> i.e. a the time of table creation?
>
> Or is it better to make the table, create the function, then alter table
with a check
> constraint?

The function has to exist before the constraint is created. If the function
depends on the table that will have the constraint, you will need to add the
constraint afterwards; however, if the function only depends on other
tables, then you can create the function before creating the table.
--
Peter Gibbs
EmKel Systems


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