Using the instance of the Airport database, formulate the following queries in the relational algebra: 1)List the name and the state of all United States airports. 2)List full details of all airports located outside the United States. Note: You should use the not equal sign  in this query. 3)Display the number of all carriers and the average of their revenues. 4)Display the minimum, the average, and the maximum distances of the flights that are scheduled on October 17th, 2017? Example: List all airport names. π name Airport

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