Posted by Guja on 02/14/06 13:55

Paul Spratley је написао
> 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!


hello!
try this:

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

[Back to original message]