sql - Data Model to represent Flat and Variable rate -

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i designing database app sell parking spot use. customer can order n number of uses of parking spot uses or pay flat rate , use monthly/weekly or yearly. can mix of also. can buy 9 parking spot uses , later decide pay whole month - in case charges kind of pro-rated. this, have customer table, order table , order type table. however, having hard time order-type table.

can 1 please shed light on how model rate , available spot-uses customer?


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