Try something like:
Create function new_function(value_data_type) 'Select sum(t1.var1) from t1 where t1.var2 = $1' LANGUAGE
'sql';
update t2 set var1=t2.var1+new_function(t2.var2);
-----Original Message-----From: M Simms [SMTP:grim@argh.demon.co.uk]Sent: Saturday, May 01, 1999 8:26 PMTo:
pgsql-sql@postgreSQL.orgSubject: [SQL] Update problem I cannot work out
I cannot work out how to do the following query
testdb=> select * from t1;var1|var2----+---- 1| 2 2| 2 2| 3(3 rows)
testdb=> select * from t2;var1|var2----+---- 5| 2 9| 3 4| 4(3 rows)
I need to add to the value of each var1 in t2 the sum of all var1's
in t1that have the same value corresponding var2's
testdb=> update t2 set var1=t2.var1+sum(t1.var1) where
t1.var2=t2.var2;ERROR: parser: illegal use of aggregates or non-group column in
target list
I imagine that this is failing because it isnt sure which values tosum(), but I cannot for the life of me figure out
howto solve this.
My second idea was to do
testdb=> update t2 set var1=t2.var1+t1.var1 where t2.var2=t1.var1;NOTICE: Non-functional update, only first update is
performedUPDATE1
This will only, obviously, add one of the values I need to add.
The values I need to end up with, just so you know you are solving
theright problem, are:
testdb=> select * from t1;var1|var2----+---- 1| 2 2| 2 2| 3(3 rows)
testdb=> select * from t2;var1|var2----+---- 8| 2 11| 3 4| 4(3 rows)
Any help on this would be appreciated. I am a bit stuck here, and I
amsure I am just missing something blindingly obvious.I am loathe to use a cursor to do this, because my actual dataset
isupwardsof 10,000 records, and I do not wish to do 10,000 differentqueries.