Posted by Paul Spratley on 02/14/06 12:23

Hi all

Firstly this my first time posting to technical groups - so any
mistakes I apologise for in advance.

I am trying to count records in several secondary tables for the same
run in a primary table. However, there might be no records in these
secondary tables for the specific run. Hence the sql below returns
nulls.

Select run, (select count(errors) from table2 where run = t1.run group
by run) as errors, (select count(user) as users from table3 where run =
t1.run and user = active group by run, dd)
from table1 t1

(Please note the different group bys. )

I do not want nulls to be returned but to be replaced with 0. I have
tried the isnull function but this does not work. eg

Select run, (select isNull(count(errors),0) from table2 where run =
t1.run group by run) as errors, (select isNull(count(user),0) as users
from table3 where run = t1.run and user = active group by run, user)
from table1 t1

Nor will isnull work if I put it around the select clause.

Any suggestions?

Thanks for the help!

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