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)


-- Guillaume. <!-- http://abs.traduc.org/ http://lfs.traduc.org/ http://traduc.postgresqlfr.org/ -->

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