I'm using Oracle 12c. Given an existing table (we call it TBL_M), and based on the criteria below, I was wondering if using inheritance makes sense to lay out the entities:
Information for one group of data (we call it Group One):
RATE
AMOUNT
FREQUENCY
And information for another group of data (we call it Group Two):
RATE
AMOUNT
FREQUENCY
DEPTH
So the columns needed for this become:
TBL_P
TBL_P_ID
RATE
AMOUNT
FREQUENCY
TBL_M_ID (fk)
TBL_C
TBL_C_ID
DEPTH
TBL_P_ID (fk)
For Group Two, every time we want to make an entry, we populate both tables (TBL_P and TBL_C). However, when the information is for Group One, TBL_P.TBL_M_ID is going to be set to NULL redundantly.
Would it be more efficient to split this into two separate tables, one for Group One, and the other for Group Two? e.g.
TBL_ONE
TBL_ONE_ID
RATE
AMOUNT
FREQUENCY
TBL_M_ID (fk)
TBL_TWO
TBL_TWO_ID
RATE
AMOUNT
FREQUENCY
DEPTH
TBL_M_ID (fk)
