Re: append fields for *where...*

Johnny C wrote:
> I have the following tables:
>
> TABLE A
> month | year | item | num
> 1 2005 myitem 003
>
> TABLE B
> num | date | descr
> 003 02-01-2005 blahblah
> 003 01-01-2005 toratora
>
> I am trying to come up with something like:
> select date,item,descr from TABLEA a
> LEFT OUTER JOIN TABLEB b ON b.num=a.num
> WHERE date=month-01-year;
>
> How can you make month (append) - 01 - (append) year? and
> pass that as a condition to the field date? Is this possible?
>

This works for me :
WHERE (month||'-01-'||year)::timestamp=date;

Here is my session :
galette=# create table a (month int4, year int4, item varchar(255), num
int4);
CREATE TABLE
galette=# insert into a values (1,2005,'myitem',3);
INSERT 17296 1
galette=# create table b (num int4, date timestamp, descr varchar(255));
CREATE TABLE
galette=# insert into b values (3,'02-01-2005','blahblah');
INSERT 17299 1
galette=# insert into b values (3,'01-01-2005','toratora');
INSERT 17300 1
galette=# select date,item,descr from a
LEFT OUTER JOIN b ON b.num=a.num
WHERE (month||'-01-'||year)::timestamp=date;
date | item | descr
---------------------+--------+----------
2005-01-01 00:00:00 | myitem | toratora
(1 ligne)

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Guillaume.
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