Gnanakumar, 31.01.2012 09:11:
Hi,
Our Production server is running PostgreSQL v8.2.22 on CentOS5.2.
You know that 8.2 is "end-of-live"?
http://www.postgresql.org/support/versioning/
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?
Something like this:
check ( (managertype = 2) or (managertype = 1 and managerid is not null) )
Not sure if the condition (managertype = 2) is actually needed, if the
managertype is already constrained to 1/2 but I can't test it right now.
Thomas
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