From: | "Madel, Kurt" <KMadel(at)USInspect(dot)com> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Trying to Creat a Rule |
Date: | 2000-08-11 17:14:42 |
Message-ID: | C6F9B91B745CD4119F1500A0C9DD60C02E346D@exchhq01.usinspect.com |
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Thread: | |
Lists: | pgsql-sql |
Hello,
I am trying to create a RULE that updates the size of a class when a student
registers for that class and the register(module) table is updated, and
subtract 1 from the given class size when a student drops a course.
Actually, there is a class table and a module table. The class table's
primary key is id, the module table consists of every module that a student
can register for a given year containing a class id.
I think I have the INSERT RULE down, but am not sure about the UPDATE RULE:
CREATE RULE module_update AS
ON UPDATE TO module.a_q1
DO
SET class.size to class.size-1
WHERE class.id=old.a_q1
AND
set class.size to class.size+1
WHERE class.id=new.a_q1;
I am really not so sure about the 'and' part, but I need to do both updates
on class, using different WHERE criteria.
TIF,
Kurt
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