Обсуждение: Problem with sql

Hi everyone,

   I have two tables:

table_1: product_code, atualization_date
table_2: id, date, value

I need to get the value of table 2 that has the greatest date that is minor that atualization_date.

The select should return something like that:
unique product_code´s, with their atualization_date and their value

Did anyone knows how to solve this problem?

Thanks a lot.

On Tue, Oct 28, 2008 at 11:36:12PM -0300, x asasaxax wrote:
> table_1: product_code, atualization_date
> table_2: id, date, value
> I need to get the value of table 2 that has the greatest date that is minor
> that atualization_date.
> The select should return something like that:
> unique product_code´s, with their atualization_date and their value

select t1.*,
    (select t2.value from table_2 as t2 where t2.date < t1.atualization_date order by t2.date desc limit 1)
from table_1 as t1
;

depesz

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