From: | Jerome Raupach <jraupach(at)intelcom(dot)fr> |
---|---|
To: | Ian Turner <vectro(at)pipeline(dot)com> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: work on some tables in the same time. |
Date: | 2000-09-13 15:58:05 |
Message-ID: | 39BFA40D.176D3FC@intelcom.fr |
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Thread: | |
Lists: | pgsql-sql |
Thanks, but:
testdb=#CREATE VIEW tableselecttemp AS SELECT DISTINCT f1, f2, f3 FROM
table1_n;
ERROR: DISTINCT not supported in views
Jerome.
Ian Turner wrote:
>
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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 AS
> SELECT 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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