Re: Join question

I have tried left, right outer and inner.

Edward W. Rouse

From: Daniel Hernandez [mailto:breydan(at)excite(dot)com]
Sent: Monday, August 18, 2008 12:30 PM
To: pgsql-sql(at)postgresql(dot)org; erouse(at)comsquared(dot)com
Subject: Re: [SQL] Join question

have you tried a right Join?

Daniel Hernndez.
San Diego, CA.
"The more you learn, the more you earn".
Fax: (808) 442-0427

-----Original Message-----
From: "Edward W. Rouse" [erouse(at)comsquared(dot)com]
Date: 08/15/2008 09:48 AM
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: [SQL] Join question

I have 2 tables, both have a user column. I am currently using a left join from table a to table b because I need to show all users from table a even those not having an entry in table b. The problem is I also have to include items from table b with that have a null user. There are some other criteria as well that are simple where clause filters. So as an example:

Table a:

Org|user

A | emp1

B | emp1

B | emp2

B | emp3

C | emp2

Table b:

Org|user|color

A |emp1|red

A |emp1|blue

A |null|pink

A |null|orange

B |emp1|red

B |emp3|red

B |null|silver

C |emp2|avacado

If I:

select org, user, count(total)

from a left join b

on (a.org = b.org and a.user = b.user)

where a.org = ‘A’

group by a.org, a.user

order by a.org, a.user

I get:

Org|user|count

A |emp1|2

A |emp2|0

A |emp3|0

But what I need is:

A |emp1|2

A |emp2|0

A |emp3|0

A |null|2

Thanks,

Edward W. Rouse