Re: How to restrict

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

Software Architect

 

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