Database HW2 B91902033 廖予銘 資工四 a.
π person−name (σ company name="_ BankFirst nCorporatio " works))( b.
π person− ,cityname (employee>< (σ company name="_ BankFirst nCorporatio " works)))( c.
π person− ,, streetcityname (employee>< (σ company name="_ BankFirst " salaryandnCorporatio >=10000 works)))( d.
π person−name (employee>< works >< company) e.
π person−name ρ employee ,1(( employee >< manages)
><(manager name=− Employee .2 name∧employee .1 street =employee .2 street ∧employee .1 city=employee city).2 ρ employee ,2(( employee))) f.
π person−name (works −σ company name="_ BankFirst nCorporatio " works))( g.
π person−name works)( −π person−name ρ works works),1((
> π company _ name company π city (/(( σ company name="_ BankSmall nCorporatio "(company)))) i. ρ three works → name 2,11(_( → company ,1 → name 4,23 → company ,2 → name 6,35 → company ),3 works works ×× works) π person _ name ( σ name name name name ∧=∧= company1()32()21(( ≠company ∧ company2()2 ≠company ∧ company3()3 ≠company ))1 three works))_( [QUERY a] SELECT T.[Planet's Name] FROM TimeTable T WHERE T.MOVIE=3 AND T.[Character's Name]="Princess Leia" [Results of QUERY a] a Planet's Name Endor Tatooine [QUERY b] SELECT COUNT(T.[Character's Name]) FROM TimeTable AS T WHERE T.MOVIE=3 AND T.[Planet's Name]="Dagobah" [Results of QUERY b] b Expr1000 3 [QUERY c] SELECT C.[Name] FROM TimeTable AS T, Characters C WHERE T.[Character's Name]=C.[Name] AND T.[Movie]=2 AND C.[Homeworld]=T.[Planet's Name] [Results of QUERY c] c Name [QUERY d] SELECT T.[Character's Name] FROM TimeTable T,Planets P WHERE T.[Planet's Name]=P.[Name] AND P.[Affiliation]="rebels" [Results of QUERY d] d Character's Name C-3 PO d Character's Name Chewbacca Darth Vader Han Solo Luke Skywalker Princess Leia R2-D2 [QUERY e] SELECT T.[Planet's Name] FROM TimeTable T,Characters C WHERE T.[Character's Name]=C.[Name] AND C.[Race]="droid" [Results of QUERY e] e Planet's Name Bespin Hoth Tatooine Tatooine Bespin Dagobah Dagobah Endor Hoth [QUERY f] SELECT C.Name, P.Name, SUM( T.[Time of Departure] - T.[Time of Arrival] + 1 ) AS amount FROM Characters AS C, TimeTable AS T, Planets AS P WHERE T.[Character's Name]=C.Name AND T.[Planet's Name]=P.Name AND P.[Affiliation]="neutral" GROUP BY C.name,P.name [Results of QUERY f] f C.Name P.Name amount C-3 PO Bespin 5 C-3 PO Tatooine 6 Chewbacca Bespin 5 Chewbacca Endor 6 Chewbacca Tatooine 6 Darth Vader Bespin 6 Han Solo Bespin 5 Han Solo Endor 6 Han Solo Tatooine 6 Jabba the Hutt Tatooine 25 Lando Calrissian Bespin 10 Lando Calrissian Endor 2 Lando Calrissian Tatooine 3 Luke Skywalker Bespin 3 Luke Skywalker Dagobah 7 Luke Skywalker Endor 4 Luke Skywalker Tatooine 5 Obi-Wan Kanobi Tatooine 3 Owen Lars Tatooine 2 Princess Leia Bespin 5 Princess Leia Endor 6 Princess Leia Tatooine 3 R2-D2 Bespin 3 R2-D2 Dagobah 7 R2-D2 Endor 4 Rancor Tatooine 26 Yoda Dagobah 28 [QUERY g] SELECT T.[Movie],C.Name FROM Characters AS C, TimeTable AS T, Planets AS P WHERE ( ( C.Race="Human" AND C.Name=T.[Character's Name] AND P.type="desert" ) OR ( C.Race="Droid" AND P.type="swamp" ) ) AND C.Name=T.[Character's Name] AND P.Name=T.[Planet's Name] ORDER BY T.Movie, C.Name [Results of QUERY g] SimpleQuery Movie Name 1 Han Solo 1 Luke Skywalker 1 Obi-Wan Kanobi 1 Owen Lars 2 R2-D2 3 Han Solo 3 Lando Calrissian 3 Luke Skywalker 3 Princess Leia 3 R2-D2 [QUERY h] SELECT DISTINCT T1.Movie, T1.[Character's Name] FROM TimeTable AS T1 WHERE NOT EXISTS ( SELECT * FROM TimeTable AS T2 WHERE T1.Movie=T2.Movie AND ( SELECT COUNT( T3.[Planet's name] ) From TimeTable AS T3 WHERE T1.[Character's Name] = T3.[Character's Name] AND T3.Movie = T1.Movie ) < ( SELECT COUNT( T4.[Planet's name] ) From TimeTable AS T4 WHERE T2.[Character's Name] = T4.[Character's Name] AND T4.Movie = T2.Movie ) ) [Results of QUERY h] h Movie Character's Name 1 Luke Skywalker 2 Luke Skywalker 2 R2-D2 3 Luke Skywalker [QUERY i] SELECT DISTINCT T1.Movie, T1.[Planet's Name] FROM TimeTable AS T1 WHERE NOT EXISTS ( SELECT * FROM TimeTable AS T2 WHERE T1.Movie=T2.Movie AND ( SELECT COUNT( T3.[Character's name] ) From TimeTable AS T3 WHERE T1.[Planet's Name] = T3.[Planet's Name] AND T3.Movie = T1.Movie ) < ( SELECT COUNT( T4.[Character's name] ) From TimeTable AS T4 WHERE T2.[Planet's Name] = T4.[Planet's Name] AND T4.Movie = T2.Movie ) ) [Results of QUERY i] i Movie Planet's Name 1 Tatooine 2 Bespin 3 Tatooine [QUERY j] SELECT Tmp1.[Movie],Tmp1.[Race],Tmp1.[Name] FROM ( SELECT C.[Name], C.[Race],T1.[Movie], SUM( T1.[Time of Departure] - T1.[Time of Arrival] + 1 ) AS amount FROM Characters AS C, TimeTable AS T1 WHERE C.Name = T1.[Character's Name] GROUP BY C.Name, C.[Race], T1.[Movie] ) AS Tmp1 WHERE NOT EXISTS ( SELECT * FROM ( SELECT C.[Name], C.[Race],T1.[Movie], SUM( T1.[Time of Departure] - T1.[Time of Arrival] + 1 ) AS amount FROM Characters AS C, TimeTable AS T1 WHERE C.Name = T1.[Character's Name] GROUP BY C.Name, C.[Race], T1.[Movie] ) AS Tmp2 WHERE Tmp1.[Movie]=Tmp2.[Movie] AND Tmp1.[Race]=Tmp2.[Race] AND Tmp1.[Amount] < Tmp2.[Amount] ) ORDER BY Tmp1.[Movie],Tmp1.[Race] [Results of QUERY j] j Movie Race Name 1 Droid C-3 PO 1 Human Darth Vader 1 Hutt Jabba the Hutt 1 Rancor Rancor 1 Unknown Yoda 1 Wookie Chewbacca 2 Droid R2-D2 2 Human Luke Skywalker 2 Hutt Jabba the Hutt j Movie Race Name 2 Rancor Rancor 2 Unknown Yoda 2 Wookie Chewbacca 3 Droid R2-D2 3 Human Luke Skywalker 3 Hutt Jabba the Hutt 3 Rancor Rancor 3 Unknown Yoda 3 Wookie Chewbacca [QUERY k] ( SELECT P1.[Name] FROM Planets AS P1 WHERE P1.[Name] NOT IN ( SELECT T1.[Planet's Name] FROM TimeTable AS T1 WHERE T1.[Movie]=1 ) ) UNION ( SELECT P2.[Name] FROM Planets AS P2 WHERE P2.[Name] NOT IN ( SELECT T2.[Planet's Name] FROM TimeTable AS T2 WHERE T2.[Movie]=2 ) ) [Results of QUERY k] k Name Alderaan Bespin Corellia Death Star Endor Hoth Kashyyyk Star Destroyer