Given aircraft (ano ,amodel, mfgYr) fleet ( fno, src ,dest, ano ,pno ) pilot (pno, pname,...

Given aircraft (ano ,amodel, mfgYr) fleet ( fno, src ,dest, ano ,pno ) pilot (pno, pname, gender)
write relational alzebra query for the following
1. find those pnames who havent taken a fleet
2. retreive the fno ,amodel that the pilot has named 'abc' flew

Expert Solution

1. Retrieve pname of pilots,who havent taken a fleet.

STRUCTURED QUERY :	SELECT pilot.pname FROM pilot WHERE pilot.pno NOT IN (SELECT fleet.pno FROM fleet);
RELATIONAL ALGEBRA QUERY :	_pilot.pname _{pilot.pno =}(_fleet.pno(fleet)) (pilot)

2. Retrieve fno, amodel that the pilot has named "abc" flew.

STRUCTURED QUERY :

SELECT fleet.fno FROM fleet INNER JOIN pilot ON fleet.pno=pilot.pno WHERE pilot.pname="abc" AND pilot.ano IN ( SELECT aircraft.ano,aircraft.amodel FROM aircraft INNER JOIN fleet ON aircraft.ano=fleet.ano);

RELATIONAL ALGEBRA QUERY :

_fleet.fno_{pilot.pname="abc"^pilot.ano
=}

[_{aircraft.ano,aircraft.amodel}((aircraft)_{aircraft.ano=fleet.ano}(fleet))]

((fleet)_fleet_{.pno=pilot.pno}(pilot))

venereology answered 1 year ago

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