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> 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
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