Ignore empty rows

Question

I have the following table structure
AccountTable
...accountID
...RegionID
...CategoryID
...subtypeID
CategoryTable
...CategoryID
...accountID
RegionTable
...RegionID
...accountID
SubtypeTable
...SubtypeID
...accountID
I want to form a query which will select all accounts belonging to a category,region & subtype(all AND).suppose if any of this table doesnt have data then the query should ignore that table and get data for the other two conditions. is there any way to do that in PL/SQL??(no procedures/functions)

Answer 1

Hi,
My problem is a bit different. in the tables i've included the wrong attribute.
CategoryTable
categoryID
criteriaID
RegionTable
regionID
criteriaID
I want to get all the accounts belonging to particular category/region with a particular criteria ID(All AND).so i have to have a query like
select accountID from accountstable acc where
acc.regionID in (select regionID from regiontable where criteriaID = 34)
and
acc.categoryID in (select categoryID from categorytable where criteriaID = 34)
but the problem is if any one of category/region is not having record it wont get me rows for the other condition
I cameup with a solution like this
select accountID from accountstable acc where
acc.regionID in (select regionID from regiontable where criteriaID = 34)
or
(select count(regionID) from regiontable where criteriaID = 34) = 0)
and
acc.categoryID in
select categoryID from categorytable where criteriaID = 34)
or
(select count(categoryID ) from categorytable where criteriaID = 34) = 0)
This works fine as it negates the condition when no row is found. the pblm is it is taking more time
any suggestion??