mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2025-01-18 18:44:06 +08:00
Code Issues Packages Projects Releases Wiki Activity

Simplify trigger example, per Mark Kirkwood.

Browse Source
This commit is contained in:
Tom Lane 2005-01-15 03:38:44 +00:00
parent 2c1abfd979
commit 893c66de69
1 changed files with 7 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
doc/src/sgml/plpgsql.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.56 2005/01/14 01:16:22 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.57 2005/01/15 03:38:44 tgl Exp $
-->
<chapter id="plpgsql">
@ -2787,17 +2787,12 @@ CREATE OR REPLACE FUNCTION maint_sales_summary_bytime() RETURNS TRIGGER AS $main
amount_sold,
units_sold,
amount_cost)
SELECT f.time_key,
sum(f.amount_sold),
sum(f.units_sold),
sum(f.amount_cost)
FROM sales_fact f
WHERE f.time_key = delta_time_key
GROUP BY f.time_key;
-- This query can potentially be very expensive if the trigger
-- is created on sales_fact without the time_key indexes.
-- Some care is needed to ensure that this situation does
-- *not* occur.
VALUES (
delta_time_key,
delta_amount_sold,
delta_units_sold,
delta_amount_cost
);
EXCEPTION
--
-- Catch race condition when two transactions are adding data