Re: How to restrict

On 26/2/19 5:11 μ.μ., Campbell, Lance wrote:
>
> PostgreSQL 10.x
>
> What is the best way to restrict the values on a text field to make sure they only contain particular values:  Example:  The field “type” can only contain the values of “X”, “Y” and “Z”. Would a
> trigger be the best strategy?  Or is there a special SQL type I should use in this particular case?
>
Easy with a CHECK CONSTRAINT, like :
create table baba (type varchar(10) CHECK (type in ('X','Y','Z')));
>
> Thanks,
>
> *LANCE CAMPBELL <https://directory.illinois.edu/person/lance>*
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