I have two tables
Table "public.mailings"
Column | Type | Modifiers
--------+-------------------+-----------
key | character varying |
name | character varying |
Table "public.userdata"
Column | Type | Modifiers
--------+-------------------+-----------
key | character varying |
uid | character varying |
name | character varying |
which hold the following data
mailing:
key | name
-----+--------
A1 | Test 1
A2 | Test 2
A3 | Test 3
A4 | Test 4
userdata:
key | uid | name
-----+-----+--------
A1 | B1 | Test 1
A3 | B1 | Test 3
A2 | B2 | Test 2
A3 | B2 | Test 3
A4 | B2 | Test 4
A2 | B2 | Test 2
A1 | B3 | Test 1
A4 | B3 | Test 4
A1 | B4 | Test 1
A2 | B5 | Test 2
A3 | B5 | Test 3
A4 | B5 | Test 4
A1 | B6 | Test 1
A2 | B6 | Test 2
A3 | B6 | Test 3
A4 | B6 | Test 4
I want to select the data between userdata and mailings, that adds me
a null row to the mailings if mailing table does not have a matching
row for "key" in the grouping "uid".
So eg the result should look like this
key | name | key | uid | name
-----+--------+-----+-----+--------
A1 | Test 1 | A1 | B1 | Test 1
A2 | Test 2 | | |
A3 | Test 3 | A3 | B1 | Test 3
A4 | Test 4 | | |
A1 | Test 1 | | |
A2 | Test 2 | A2 | B2 | Test 2
A2 | Test 2 | A2 | B2 | Test 2
A3 | Test 3 | A3 | B2 | Test 3
A4 | Test 4 | A4 | B2 | Test 4
...
but my problem is, that a normal join will not work, because both
tables will hold a complete set of matching "key" data. I need to sub
group the join through the "uid" column from the userdata.
But i have no idea how to do this. Any idea if there is a simple way to do this?
--
[ Clemens Schwaighofer -----=====:::::~ ]
Advertising Age Global Agency of the Year 2008
Adweek Global Agency of the Year 2008
This e-mail is intended only for the named person or entity to which
it is addressed and contains valuable business information that is
privileged, confidential and/or otherwise protected from disclosure.
Dissemination, distribution or copying of this e-mail or the
information herein by anyone other than the intended recipient, or
an employee or agent responsible for delivering the message to the
intended recipient, is strictly prohibited. All contents are the
copyright property of TBWA Worldwide, its agencies or a client of
such agencies. If you are not the intended recipient, you are
nevertheless bound to respect the worldwide legal rights of TBWA
Worldwide, its agencies and its clients. We require that unintended
recipients delete the e-mail and destroy all electronic copies in
their system, retaining no copies in any media.If you have received
this e-mail in error, please immediately notify us via e-mail to
disclaimer@xxxxxxxxxxxxxx We appreciate your cooperation.
We make no warranties as to the accuracy or completeness of this
e-mail and accept no liability for its content or use. Any opinions
expressed in this e-mail are those of the author and do not
necessarily reflect the opinions of TBWA Worldwide or any of its
agencies or affiliates.
--
Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
