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I have three tables –
Transaction:
ID TimeStamp
Discount:
Code Amount
Transaction_Discount:
ID Code
It’s almost as basic as you can get.
Is there a more ‘efficient’ way to link these tables together?
If you are modelling a transaction can have 0 or more discounts and a discount can be applied to 0 or more transactions then this 3 table approach is the standard way to go.
The only change I would make would be to give discount a numeric primary key in addition to the code field and use this as the foreign key in Transaction_Discount.