SQL Queries on Flights and Planes Databases

This practical assignment demonstrates the use of SQL queries to analyze data from two databases: 'flights' and 'planes'. The first problem involves finding the furthest destination in the 'flights' database using a query to select the maximum distance. The second problem is more complex, requiring multiple queries. It first identifies the different engine types in the 'planes' database. Then, for each engine type, it finds the aircraft model with the maximum number of seats. The solutions provide the SQL queries used and the resulting outputs, clearly showing the steps involved in solving each problem. The assignment showcases practical SQL skills in data retrieval and analysis.

1. Which destination in the flights database is the furthest distance away,
based on information in the flights table. Show the SQL query(s) that support
your conclusion.
Query - SELECT DISTINCT carrier, flight, origin, dest, distance FROM flights WHERE distance =
(SELECT MAX(distance) FROM flights);
Output - ‘HA','51','JFK','HNL','4983'
Therefore, the furthest distance destination is HNL which is Honolulu International airport.
2. What are the different numbers of engines in the planes table? For each
number of engines, which aircraft have the most number of seats? Show the
SQL statement(s) that support your result.
Query - SELECT engine FROM planes GROUP BY engine;
Output -
4 Cycle
Reciprocating
Turbo-fan
Turbo-jet
Turbo-prop
Turbo-shaft
Therefore, there are 6 different numbers of engines in the plane table
Query - SELECT DISTINCT model, seats FROM planes WHERE engine = 'Turbo-fan' AND seats
= (SELECT MAX(seats) FROM planes WHERE engine = 'Turbo-fan');
Output - ‘777-222’,'400' , ’777-224,'400'
Therefore, aircraft 777-222 and 777-224 has the most number of seats i.e. 400 for engine
Turbo-fan.
Query - SELECT DISTINCT model, seats FROM planes WHERE engine = 'Turbo-jet' AND seats =
(SELECT max(seats) FROM planes WHERE engine = 'Turbo-jet');
Output - ‘747-451’,'450'
Therefore, aircraft 747-451 has the most number of seats i.e. 450 for engine Turbo-jet.
Query - SELECT DISTINCT model, seats FROM planes WHERE engine = 'Turbo-prop' AND seats
= (SELECT max(seats) FROM planes WHERE engine = 'Turbo-prop');

Output - ‘E-90','10'
Therefore, aircraft E-90 has the most number of seats i.e. 10 for engine Turbo-prop.
Query - SELECT DISTINCT model, seats FROM planes WHERE engine = 'Turbo-shaft' AND
seats = (SELECT max(seats) FROM planes WHERE engine = 'Turbo-shaft');
Output - ’S-76A','14'
Therefore, aircraft S-76A has the most number of seats i.e. 14 for engine Turbo-shaft.
Query - SELECT DISTINCT model, seats FROM planes WHERE engine = 'Reciprocating' AND
seats = (SELECT max(seats) FROM planes WHERE engine = 'Reciprocating');
Output - ‘DC-7BF','102'
Therefore, aircraft DC-7BF has the most number of seats i.e. 102 for engine Reciprocating.
Query - SELECT DISTINCT model, seats FROM planes WHERE engine = '4 Cycle' AND seats =
(SELECT max(seats) FROM planes WHERE engine = '4 Cycle');
Output - ‘172M’,'4'
Therefore, aircraft 172M has the most number of seats i.e. 4 for engine 4- Cycle.