Hotel reservation system: How to store individual price for each night of a reservation?

The purely relational approach would be to have a ReservationNight table, which stored details about each night of a reservation, including the price. Yes, the table will grow quickly, but no matter how you store the prices, the data will grow quickly.

In general, comma-delimited lists don't belong in SQL databases. I'd say your best bet would be a junction table.

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