Re: SELECT with sum on groups ORDERING by the subtotals

This might work,
select * from (SELECT * FROM product_sales()) t order by t.code
desc,t.subtotal;

with regards,
S.Gnanavel

> -----Original Message-----
> From: grupos(at)carvalhaes(dot)net
> Sent: Thu, 16 Jun 2005 10:07:15 -0300
> To: s(dot)gnanavel(at)inbox(dot)com, pgsql-sql(at)postgresql(dot)org
> Subject: Re: [SQL] SELECT with sum on groups ORDERING by the subtotals
>
> Hi !
>
> This is not possible because the query will have a time interval and the
> subtotal will change due the intervals passed to the query...
> To get the subtotal I already know how to do it (see below) but the
> problem is get the correct output, ordering by the bigger totals
> agrouped by product code
>
> CREATE TYPE subtotal_type AS
> (code varchar(15),
> description varchar(60),
> quant float8,
> price float8,
> total float8,
> subtotal float8);
>
>
> CREATE OR REPLACE FUNCTION product_sales()
> RETURNS SETOF subtotal_type AS
> $BODY$
> DECLARE
> tbrow RECORD;
> sbrow subtotal_type;
>
> BEGIN
> sbrow.subtotal := 0;
> FOR tbrow IN
> SELECT code, description, quant, price, total FROM test ORDER BY code
> LOOP
>
> IF sbrow.code = tbrow.code THEN
> sbrow.subtotal := sbrow.subtotal + tbrow.total;
> ELSE
> sbrow.subtotal := tbrow.total;
> END IF;
> sbrow.code := tbrow.code;
> sbrow.description := tbrow.description;
> sbrow.quant := tbrow.quant;
> sbrow.price := tbrow.price;
> sbrow.total := tbrow.total;
>
> RETURN NEXT sbrow;
> END LOOP;
>
>
> RETURN;
>
> END;
> $BODY$
> LANGUAGE 'plpgsql' VOLATILE;
>
> With this function my output is:
>
> dadosadv=# SELECT * FROM product_sales();
> code | description | quant | price | total | subtotal
> -------+-------------+-------+-------+-------+----------
> 92110 | PRODUCT A | 10 | 1 | 10 | 10
> 92110 | PRODUCT A | 5 | 0.9 | 9 | 19
> 92110 | PRODUCT A | 100 | 0.9 | 90 | 109
> 92110 | PRODUCT A | 10 | 1.1 | 11 | 120
> 92190 | PRODUCT b | 10 | 1.1 | 11 | 11
> 92190 | PRODUCT b | 10 | 1.1 | 11 | 22
> 92190 | PRODUCT b | 10 | 1.1 | 11 | 33
> 92190 | PRODUCT b | 20 | 0.8 | 8 | 41
> 99120 | PRODUCT C | 10 | 0.8 | 8 | 8
> 99120 | PRODUCT C | 100 | 0.8 | 80 | 88
> 99120 | PRODUCT C | 200 | 0.8 | 160 | 248
> 99120 | PRODUCT C | 100 | 0.9 | 90 | 338
> (12 rows)
>
> The only problem that I have is that I need to order by the
> max(subtotal) aggrouped by code. My desired output is:
>
> code | description | quant | price | total | subtotal
> -------+-------------+-------+-------+-------+----------
> 99120 | PRODUCT C | 10 | 0.8 | 8 | 8
> 99120 | PRODUCT C | 100 | 0.8 | 80 | 88
> 99120 | PRODUCT C | 200 | 0.8 | 160 | 248
> 99120 | PRODUCT C | 100 | 0.9 | 90 | 338
> 92110 | PRODUCT A | 10 | 1 | 10 | 10
> 92110 | PRODUCT A | 5 | 0.9 | 9 | 19
> 92110 | PRODUCT A | 100 | 0.9 | 90 | 109
> 92110 | PRODUCT A | 10 | 1.1 | 11 | 120
> 92190 | PRODUCT b | 10 | 1.1 | 11 | 11
> 92190 | PRODUCT b | 10 | 1.1 | 11 | 22
> 92190 | PRODUCT b | 10 | 1.1 | 11 | 33
> 92190 | PRODUCT b | 20 | 0.8 | 8 | 41
>
> Any tip?
>
> Regards,
>
> Rodrigo Carvalhaes
>
>
> Gnanavel Shanmugam wrote:
>
> >I think it will be better to add one more column for subtotal and
> >write an "on before insert" trigger to update the subtotal with sum of
> >total.
> >
> >
> >
> >
> >>-----Original Message-----
> >>From: grupos(at)carvalhaes(dot)net
> >>Sent: Thu, 16 Jun 2005 00:56:42 -0300
> >>To: pgsql-sql(at)postgresql(dot)org
> >>Subject: [SQL] SELECT with sum on groups ORDERING by the subtotals
> >>
> >>Hi Guys!
> >>
> >>I need to make a complex query. I am thinking to use plpgsql BUT I am
> >>confused how I can solve this.
> >>
> >>What I have:
> >>CREATE TABLE test
> >>(
> >> code varchar(15),
> >> description varchar(60),
> >> group varchar(10),
> >> quant float8,
> >> price float8,
> >> total float8
> >>)
> >>WITHOUT OIDS;
> >>
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('92110', 'PRODUCT A', 10, 1, 10);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('92110', 'PRODUCT A', 5, 0.90, 9);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('92110', 'PRODUCT A', 100, 0.9, 90);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('92110', 'PRODUCT A', 10, 1.1, 11);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('92190', 'PRODUCT b', 10, 1.1, 11);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('92190', 'PRODUCT b', 10, 1.1, 11);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('92190', 'PRODUCT b', 10, 1.1, 11);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('92190', 'PRODUCT b', 20, 0.8, 8);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('99120', 'PRODUCT C', 10, 0.8, 8);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('99120', 'PRODUCT C', 100, 0.8, 80);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('99120', 'PRODUCT C', 200, 0.8, 160);
> >>INSERT INTO test (code, description, quant, price, total) VALUES
> >>('99120', 'PRODUCT C', 100, 0.9, 90);
> >>
> >>
> >>I need an subtotal for all the products with the same group and that
> the
> >>query be ordered by the bigger subtotal.
> >>
> >>For example, I need an output like this:
> >>Ex.
> >>
> >>
> >> code | description | quant | price | total | subtotal
> >>-------+-------------+-------+-------+-------+----------
> >> 99120 | PRODUCT C | 10 | 0.8 | 8 | 8
> >> 99120 | PRODUCT C | 100 | 0.8 | 80 | 88
> >> 99120 | PRODUCT C | 200 | 0.8 | 160| 168
> >> 99120 | PRODUCT C | 100 | 0.9 | 90 | 667
> >> 92110 | PRODUCT A | 10 | 1 | 10 | 10
> >> 92110 | PRODUCT A | 5 | 0.9 | 9 | 19
> >> 92110 | PRODUCT A | 100 | 0.9 | 90 | 109
> >> 92110 | PRODUCT A | 10 | 1.1 | 11 | 120
> >> 92190 | PRODUCT b | 10 | 1.1 | 11 | 11
> >> 92190 | PRODUCT b | 10 | 1.1 | 11 | 22
> >> 92190 | PRODUCT b | 10 | 1.1 | 11 | 33
> >> 92190 | PRODUCT b | 20 | 0.8 | 8 | 41
> >>
> >>The subtotal column must sum all the products with the same code and
> put
> >>the result in order of the bigger sultotals.
> >>
> >>Only make a function that sum the last value + the subtotal it's not
> >>hard BUT how I can make the subtotal restart when the code changes and
> >>how I will order the result by the bigger subtotal code groups?
> >>
> >>Thanks!
> >>
> >>Rodrigo Carvalhaes
> >>
> >>--
> >>Esta mensagem foi verificada pelo sistema de antivírus e
> >> acredita-se estar livre de perigo.
> >>
> >>
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> broadcast)---------------------------
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> >>
> >>
> >
> >
> >with regards,
> >S.Gnanavel
> >
> >
>
> --
> Esta mensagem foi verificada pelo sistema de antivrus e
> acredita-se estar livre de perigo.
>
>
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