|PostgreSQL Reference Manual - Volume 2 - Programming Guide|
by The PostgreSQL Global Development Group
Paperback (6"x9"), 408 pages
RRP £19.95 ($34.95)
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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 0954612035||PostgreSQL Reference Manual - Volume 2 - Programming Guide||See the print edition|