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Simplify trigger example, per Mark Kirkwood.

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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
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19
doc/src/sgml/plpgsql.sgml
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@ -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"> <chapter id="plpgsql">
@ -2787,17 +2787,12 @@ CREATE OR REPLACE FUNCTION maint_sales_summary_bytime() RETURNS TRIGGER AS $main
amount_sold, amount_sold,
units_sold, units_sold,
amount_cost) amount_cost)
SELECT f.time_key, VALUES (
sum(f.amount_sold), delta_time_key,
sum(f.units_sold), delta_amount_sold,
sum(f.amount_cost) delta_units_sold,
FROM sales_fact f delta_amount_cost
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.
EXCEPTION EXCEPTION
-- --
-- Catch race condition when two transactions are adding data -- Catch race condition when two transactions are adding data