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
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