Обсуждение: work on some tables in the same time.

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 ;

------------------------------------------------------------------

CREATE TABLE table1_1( INT2 f1, INT2 f2, INT2 f3, INT2 f4 );
CREATE TABLE table1_2( INT2 f1, INT2 f2, INT2 f3, INT2 f4 );
...

CREATE TABLE table2_1( INT2 f1, INT2 f2, INT2 f3 );
CREATE TABLE table2_2( INT2 f1, INT2 f2, INT2 f3 );
...

------------------------------------------------------------------

Anyone can help me ?
Thanks in advance.

Jerome.

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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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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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> FkuWQ4rEUUMI6bCcZkCU3XA=
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> testdb=#CREATE VIEW tableselecttemp AS SELECT DISTINCT f1, f2, f3 FROM
> table1_n;
> ERROR:  DISTINCT not supported in views

In that case, you'll have to create a temporary table instead. This may
actually be faster, because you only have to search table1_n once.

Ian
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I'm assuming you want "n" to be replaced by the numbers up to
the last one where there is a table1_n and table2_n, right?

I'd suggest looking and PL/TCL (or if you can wait for 7.1, you
can probably do it in PL/PGSQL as well with the new exec stuff.)
and writing a function that does the inserts for you.

Stephan Szabo
sszabo@bigpanda.com

On Wed, 13 Sep 2000, Jerome Raupach wrote:

> 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 ;
> 
> ------------------------------------------------------------------
> 
> CREATE TABLE table1_1( INT2 f1, INT2 f2, INT2 f3, INT2 f4 );
> CREATE TABLE table1_2( INT2 f1, INT2 f2, INT2 f3, INT2 f4 );
> ...
> 
> CREATE TABLE table2_1( INT2 f1, INT2 f2, INT2 f3 );
> CREATE TABLE table2_2( INT2 f1, INT2 f2, INT2 f3 );
> ...
> 
> ------------------------------------------------------------------
> 
> Anyone can help me ?
> Thanks in advance.
> 
> Jerome.
>