Re: SQL CASE Statements

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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