Please answer in SQL:   List all airlines. For every airline, compute the number of regional airports (full name of airport contains the string 'Regional') from which that airline does NOT fly, considering source airport only. Sort by airport count in descending order.   airlines dataset Id : unique identifier of the airline Name : full name of the airline Abbr : abbreviated name of the airline Country : country of the airline   airports dataset City : location of the airport Code : unique three-letter airport code Name : name of the airport Country : country of the airport CAbbr : abbreviation of the country   flights dataset Airline : airline that manages the flight FlightNo : flight number (unique for each airline, may repeat                 for different airlines) Source : Code for the airport from which the flight originates Destination : Code for the airport at which the flight terminates   Attempted (but incorrect) code: SELECT airlines.Name, COUNT(airports.Code) as num_airlines FROM airlines, airports WHERE airports.Name LIKE '%regional%'      AND airports.Code NOT IN (SELECT source FROM flights) GROUP BY airlines.Id ORDER BY num_airlines DESC

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Multiple Table

In a database, a table is used to store data in the form of rows and columns. Rows are aligned horizontally and identified by one or more values in a specific column. Columns are vertically aligned and identified by a unique column name.