Halley, here is a sample for you that might help; the purpose of this
function was to set an indicator of '1' or '0' (true or false) on a router
interface if the router interface ID was the same as the default gateway for
the Router node ID:
create view current_default_gateways_v (router_id, default_gateway) AS select router_id, case when router_id in
(selectinterface_id from router_interface ri,
network_nodes nn where ri.node_id = nn.node_id and ri.interface_id =
nn.default_gateway_interface_id)
then 1 else 0 end as if_default_gateway from router_interface;
TABLES USED:
network_nodes: node_id, serial node_name, varchar default_gateway_interface_id, integer
router_interfaces: interface_id, serial (integer) node_id (FK)
-----Original Message-----
From: Halley Pacheco de Oliveira [mailto:halleypo@yahoo.com.br]
Sent: Saturday, August 20, 2005 7:25 AM
To: pgsql-sql@postgresql.org
Cc: lvaningen@esncc.com
Subject: RE: SQL CASE Statements
> Has anybody done this? If so, can you send me a sample?
CREATE TEMPORARY TABLE fruits (id SERIAL, name TEXT);
INSERT INTO fruits VALUES (DEFAULT, 'banana');
INSERT INTO fruits VALUES (DEFAULT, 'apple');
CREATE TEMPORARY TABLE food (id SERIAL, name TEXT);
INSERT INTO food VALUES (DEFAULT, 'apple');
INSERT INTO food VALUES (DEFAULT, 'spinach');
SELECT name, CASE WHEN name = ANY (SELECT name FROM fruits) THEN 'yes' ELSE 'no'
END AS fruit
FROM food;
name | fruit
---------+-------apple | yesspinach | no
(2 lines)
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