Hi,

I have a follow scenario:

CREATE TABLE table1 (
id integer
, vlpr numeric(10,2)
, vlab numeric(10,2)
, vlbx numeric(15,5)
, pct numeric(12,8)
);

CREATE TABLE table2 (
id integer
, fk_table1 integer
, tpop char(2)
, valor numeric(15,5)
);

insert into table1 VALUES ( 1, 200 , 0 , 0 , 1 );

insert into table2 VALUES
( 1, 1 , 'CR' , 100 )
, ( 2, 1 , 'BX' , 15 )
, ( 3, 1 , 'AC' , 40 );

I need to make update of table1 with data on table2 in the order of id
of table2

I´m trying to do an update like this:

UPDATE table1
SET vlab = vlab + CASE WHEN tHist.tpop IN ('BX' , 'DC')
THEN - tHist.valor
ELSE tHist.valor
END
, vlbx = vlbx + CASE WHEN tHist.tpop IN ('BX', 'DC')
THEN tHist.valor
ELSE 0
END
, pct = CASE WHEN tHist.tpop in ('AC', 'DC' )
THEN (vlpr - vlbx) / vlab
ELSE pct
END
FROM ( SELECT * FROM table2 ORDER BY id ) tHist
WHERE table1.id = tHist.fk_table1


The "FROM ( SELECT * FROM table2 ORDER BY id ) tHist" is a try to
force a specific order on table2 to update table1
but this isn´t working.

There are some way to do this with a UPDATE statement ?

Thanks in advance,

--
Luiz K. Matsumura
Plan IT Tecnologia Informática Ltda.
*
*

that looks like EAV. is it?

that's not going to work.

perhaps you can rewrite the from part to only return one row for every
table1_fk, this one row will combine several rows from table2

will only work if the optimiser picks index join on table 1

to do it with an update statement you need no more than one rows in the
from for each row in the target.

easiest non update statement approach is probably to use a plpgsql
function with a loop.

basically you need to find another way to do it.



--
Sent via pgsql-sql mailing list (pgsql-sql (AT) postgresql (DOT) org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-sql

Thanks for reply,

Em 16/12/2010 17:58, Jasen Betts escreveu:
Err, I don´t know so much about EAV, so I think that isn´t. I´m just
trying to reproduce a calc in a spreeadsheet.
Ok! I make a function in plpgsql to do it.

Thank´s again !

*
*