Find cities from which one can fly to toronto


Write following queries in SQL and relational algebra: 
1) Find the airports with a direct flight to Toronto 
2) Find airports with late flights to Toronto on a big plane. "Late" means departing after 9:00pm; "big" means with capacity 150 passengers or more 
3) Find cities from which one can fly to Toronto with one change of planes, and using the same type of the aircraft for both legs of the trip.

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Basic Computer Science: Find cities from which one can fly to toronto
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