There are three tables:
Clearance: CLEARANCE_ID, ZONE, LOC Zone: ZONE, ZONE_DESC Location: LOC, LOC_DESC
I have the following query.
Select * from RC.CLEARANCE_ID, RC.TYPE, RC.ZONE, R.ZONE_DESC, RC.LOC, L.LOC_DESC FROM CLEARANCE RC, ZONE R, LOC L
The value of RC.TYPE is 0 for zone, 1 for location.
I want ZONE_DESC (from zone table) to appear if the RC.TYPE = 0 and
LOC_DESC to appear from LOC table if the RC.TYPE = 1
If I join CLEARANCE table with both the other tables, if doesn’t bring records as one of the fields (ZONE or LOC) is null in every case.
How to I do this query?
CLEARANCE ID TYPE ZONE ZONE_DESC LOC LOC_DESC 3 0 10 ZONE1 null null 4 1 null null 50 Location1