Hello,
I am trying to create a RULE that update the size of a class when a student registers for that class and the register 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=module.old
AND
set class.size to class.size+1
WHERE class.id=module.new;
I am really not so sure about the and part, but I need to do both updates on class, using different WHERE criteria.
Thanks,
Kurt
