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I need help with Conceptual Data Model for Hotel Reservation. Yes, I looked at databaseanswer but my problem is not the same. My problem sounds like this The hotel reservation company wishes to realize a system for managing hotel bookings. After hotel affiliation, it will be registered in the...

I have problems with subquerys, in fact I don't know how to avoid using the same condition in the query and subquery. For example, i have the table cars(Carnumber,DateofAcquisition) I need to find out in which of the last five years were purchased the most cars?? SELECT...

Hello I need help with two problems in Access. I believe that they are similar but I don't know how it works I problem: I have a table TELEPHONE(telephone_number) where telephone number is the only field. I have to find the first number that is missing For example: suppose that I have the...