|The PostgreSQL 9.0 Reference Manual - Volume 2 - Programming Guide
by The PostgreSQL Global Development Group
Paperback (6"x9"), 478 pages
RRP £14.95 ($19.95)
Sales of this book support the PostgreSQL project! Get a printed copy>>>
7.3 Rules on INSERT, UPDATE, and DELETE
Rules that are defined on
DELETE are significantly different from the view rules
described in the previous section. First, their
RULE command allows more:
- They are allowed to have no action.
- They can have multiple actions.
They can be
- They can have rule qualifications.
Second, they don't modify the query tree in place. Instead they create zero or more new query trees and can throw away the original one.
|ISBN 9781906966065||The PostgreSQL 9.0 Reference Manual - Volume 2 - Programming Guide||See the print edition|