Re: work on some tables in the same time.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

> I want to execute this query on some table2 in the same time :
> 
> INSERT INTO table2_n(f1, f2, f3)
>     SELECT DISTINCT f1, f2, f3 FROM table1_n ;

One way would be to do:
BEGIN
CREATE VIEW tableselecttemp ASSELECT DISTINCT f1, f2, f3 FROM table1_n;
INSERT INTO table2_n(f1, f2, f3) SELECT * FROM tableselecttemp;
INSERT INTO table2  (f1, f2, f3) SELECT * FROM tableselecttemp;
DROP VIEW tableselecttemp;
ROLLBACK;

Alternatively, run the select query twice without the temporary
view. You'll have to try it both ways, on a realistic data set, to see
which is faster for you.

Ian
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.1 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQE5v6HGfn9ub9ZE1xoRAuo0AJwNCXhjE4WWH0WMeZrLZCjrR/H37ACZAR4N
FkuWQ4rEUUMI6bCcZkCU3XA=
=q6gb
-----END PGP SIGNATURE-----