You could also make a table with just that data in it so you don't have the field in all the records and you don't have to check all the records to see what is next.
I am assuming this is some kind of a flag values used in a batch, if you just need the last id I use max(id)+1. Joel Fradkin Wazagua, Inc. 2520 Trailmate Dr Sarasota, Florida 34243 Tel. 941-753-7111 ext 305 [EMAIL PROTECTED] www.wazagua.com Powered by Wazagua Providing you with the latest Web-based technology & advanced tools. C 2004. WAZAGUA, Inc. All rights reserved. WAZAGUA, Inc This email message is for the use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and delete and destroy all copies of the original message, including attachments. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, May 02, 2005 3:17 PM To: pgsql-sql@postgresql.org Subject: [SQL] Function or Field? Hi. What is the better way to store the last record for a translation??? I.E: The data for the last product vendding. What is better: a) Create a field in "product" table and create a Trigger (before insert or update into vendding table) to alter this field. b) Create a view or function that check the all venddings (in vendding table) for the specified product and return the last vendding information? a) CREATE TABLE products( id serial primary key, description varchar(50), last_vendding date() --Is correct to use this field??? ); CREATE TABLE vendding( id serial primary key, date_ date, product integer references (products) ); CREATE TRIGGER TG_change_products_last_vendding_field on table vendding BEFORE INSERT OR UPDATE FOR EACH ROW EXECUTE procedure change_products_last_vendding(); b) CREATE TABLE products ( id serial primary key, description varchar(50) ); CREATE TABLE vendding( id serial primary key, date_ date, product integer references (products) ); CREATE VIEW last_product_change as SELECT * from vendding order by date_ desc limit 1; --Okay, this view will return the last record and not the last record for a product... but its a example. I am asking it becouse I have used CLIPPER(dbase) for my old programs and in DBASE the view/check function that will check for each select is not functional. And I need to create a field in all table references, but in DBASE this fields allways broken and I need to recheck it. Thank you. ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])
