On 5 apr 2006, at 16.39, Jonas F. Henriksen wrote:
Hi,
I'm working with postgres and I have a question regarding a self-
join on
my table (se below for table definition and testdata):
I want to retrieve all depths that have either a measuretype=1040 or a
measuretype=4001 or both.
All help apreciated (hope you understand what I want to do...),
Not sure I understand why you need a join... You say you want to
retrieve all depths that have certain measuretypes. Wouldn't the
following query do?
SELECT DISTINCT depth FROM testtable WHERE measuretype IN (1040, 4001);
Is there anything else you need from the query as well?
Mvh,
Niklas Johansson
Tel: 0322-108 18
Mobil: 0708-55 86 90
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
