Is it possible to create a CHECK constraint for my use case? - Mailing list pgsql-admin

Hi,

Our Production server is running PostgreSQL v8.2.22 on CentOS5.2.  We want
to enable a specific CHECK constraint for our application table as explained
below:

There are 2 columns in the table: "managertype" numeric(1) and "managerid"
numeric(10).  "managertype" accepts only 2 valid values, either '1' or '2'.

managertype  |    managerid
---------------------------------
        1           |  null values NOT allowed
        2           | null values allowed
---------------------------------

We want to enable a CHECK constraint based on 2 columns data in the table in
such a way that if "managertype" is 1, then null values are not allowed in
"managerid" column.  In other words, I want to create a CHECK constraint
something like this: IF (managertype = 1) THEN managerid IS NOT NULL.

Is it possible to create a CHECK constraint for my use case explained above?

Regards,
Gnanam