On 7/29/05, Karim Nassar <[EMAIL PROTECTED]> wrote:
ok.
Reason might be comparing with a literal value (previous case) is cheaper than comparing with column(as it has to be evaluated). But with the previous case getting and assigning the cli_code in the application and executing in db will be time consuming as it includes IPC cost.
On Fri, 2005-07-29 at 09:41 +0530, Gnanavel S wrote:
>
> Joined:
>
> test=> explain analyze
> test-> SELECT cli_name,order.*
> test-> FROM order
> test-> JOIN client ON (ord_client = cli_code)
> test-> WHERE ord_batch='343B' AND
> ord_id='12-645';
>
> where is the cli_code condition in the above query?
I don't understand the question. ord_client is the client code, and
cli_code is the client code, for their respective tables. batch/id is
unique, so there is only one record from order, and only one client to
associate.
Clearer?
ok.
Reason might be comparing with a literal value (previous case) is cheaper than comparing with column(as it has to be evaluated). But with the previous case getting and assigning the cli_code in the application and executing in db will be time consuming as it includes IPC cost.
--
Karim Nassar <[EMAIL PROTECTED] >
--
with regards,
S.Gnanavel
Satyam Computer Services Ltd.
