On 4 Jan 2010, at 9:53, Yan Cheng Cheok wrote: > For example, "John" place "1.34" priced order. > > (1) Get Customer_ID from Customer table, where name is "John" > (2) If there are no Customer_ID returned (There is no John), insert "John" > (3) Get Customer_ID from Customer table, where name is "John" > (4) Insert "Customer_ID" and "1.34" into Order table. > > There are 4 SQL communication with database involved for this simple operation!!! > > Is there any better way, which can be achievable using 1 SQL statement? You don't need the 3rd statement if you use INSERT .. RETURNING at step 2. The one way you could achieve this by calling only one statement that I can think of is to wrap this in a stored procedure. Plain SQL doesn't provide any means to do what you want. Alban Hertroys -- Screwing up is the best way to attach something to the ceiling. !DSPAM:737,4b41d7ac9957514533904! -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
