How to select data from a table which has inter-related data? - sql

Question

I have an Oracle table OBJECTS with columns Id, parent id, object_type and name.
I have real time object types as Groups, Accounts and Services. They are hierarchical in the same order. That means, Groups contains Accounts and Accounts contains Services. So, service.parent_id will refer to account.object_id and account.parent_id will refer to group.object_id within the same table.
Criteria fields for selecting data must be passed as parameters to the query. Now, if the User provides a Group ID, then the query must fetch all Services that are belonged to all the Accounts within that group.
Similarly, if the user provides ID for Account, the query must return all the Services under the Account.
I have written the following query, but it doesn't work exactly I need. Can someone help me fix it?
WITH services AS
(SELECT nco.object_id,
nco.parent_id,
nco.object_type_id,
nco.name
FROM objects nco
WHERE nco.object_type_id = 9146522450013755288 ),
accounts AS
(SELECT nco.object_id,
nco.parent_id,
nco.name
FROM objects nco,
services ss
WHERE nco.object_type_id=9145485031713653586
AND nco.object_id = ss.parent_id ),
groups AS
(SELECT nco.object_id,
nco.parent_id,
nco.name
FROM objects nco,
accounts sa
WHERE nco.object_id = sa.parent_id
AND nco.object_type_id = 9146513648413722258 )
SELECT *
FROM services ss,
accounts sa,
groups sg
WHERE ss.object_id IN (#Services#)
OR sa.object_id IN (#Accounts#)
OR sg.object_id IN (#Groups#)
Input is passed as Macros using (##) and there can be multiple Group ID's, Account ID's and Service ID's passed. object_type_id is a column which will identify what type of object it is. For example, 9146513648413722258 refers to Services, 9145485031713653586 refers to Accounts etc.

Answer 1

In your case, an inner join makes more sense that a full join ,, therefore
SELECT services.*
FROM objects groups
INNER JOIN objects accounts
ON groups.object_type_id=9146522450013755288
AND accounts.object_type_id=9146513648413722258
AND accounts.parent_id=groups.object_id
INNER JOIN objects services
ON services.object_type_id=9145485031713653586
AND services.parent_id=accounts.object_id
WHERE services.object_id IN (#Services#)
OR accounts.object_id IN (#Accounts#)
OR groups.object_id IN (#Groups#)
The query joins the services, accounts and groups table (implicitly from the objects table) using the parent_id and then filter out the result.