1. DB HW2 B91902003 陳彥名 1.A π person-name (σ company-name= “ First Bank Corporation ” (works) ) 1.B π person-name,city (σ company-name= “ First Bank Corporation ” (employee ∞ works)) 1.C π person-name,city street ( (σ company-name= “ First Bank Corporation ”, && salary > 10000 (works) ) ∞ employee) 1.D π person-name (employee ∞ works ∞ company ) 1.E π person-name (ρ( t1,employee ∞ manages ) ∞ t1.manager-name=t2.person-name &&t1.city=t2.city &&t1.street = t2.street σ( t2,employee) )

2. 1.F π person-name (σ company-name≠ “ First Bank Corporation ” (works) ) 1.G π person-name (works) - π person-name (ρ (t1,works) ∞ t2.company-name = “ Small Bank Corporation && t1.salary <=t2.salary ρ (t2,works) ) 1.H π company-name (company / (π city (σ company-name= “ Small Bank Corporation ” (company)))) 1.I ρ (t1, π person-name, company-name ( works) ) π person-name (σ person-name = person-name1 = person-name2 && company-name ≠ company-name1 ≠ company-name2 (ρ( C(3->company-name1,5->company-name2,4->person-name1,6->person- name2),t1 ∞ t1∞ t1) ))

3. [Query A] SELECT T.[Planet's Name] FROM TimeTable T WHERE T.[Character's Name] = "Princess Leia" AND T.Movie=3; [Results of Query A] Tatooine Endor [Query B] SELECT COUNT(T.[Character's Name]) FROM TimeTable T WHERE T.[Planet's Name] = "Dagobah"AND T.[Time of Departure]=10 AND T.Movie=3;[Results of Query B] [Results of Query B] 0 [Query C] SELECT distinct T.[Character's Name] FROM TimeTable T, Characters C WHERE T.[Planet's Name] = C.[Homeworld] AND T.[Character’s Name]=C.Name ANDT.Movie=2 ; [Results of Query C] None [Query D] SELECT distinct T.[Character's Name] FROM TimeTable T, Planets P WHERE T.[Planet's Name] = P.[Name] AND P.Affiliation = "rebels" ; [Results of Query D] C-3 PO Chewbacca Darth Vader Han Solo Luke Skywalker Princess Leia R2-D2

4. [Query E] SELECT distinct T.[Planet's Name] FROM TimeTable T, Characters C WHERE T.[Character's Name] = C.[Name] AND C.Race="Droid" ; [Results of Query [E] Bespin Dagobah Endor Hoth Tatooine [Query F] SELECT C.name, P.name, sum (T.[Time of Departure]-T.[Time of Arrival]+1) as TotalTime FROM Characters C, TimeTable T, Planets 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 C.name, P.name; [Results of Query F] 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 HuttTatooine 25 Lando Calrissian Bespin10 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

5. [Query G] SELECT T.Movie, C.Name FROM Characters C, TimeTable T, Planets P WHERE ((C.Race="Human" 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] 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 Movie, [Character's Name] FROM TimeTable t1 WHERE NOT EXISTS ( SELECT * FROM TimeTable t2 WHERE t1.Movie=t2.Movie AND (SELECT COUNT([Planet's Name]) FROM TimeTable WHERE t1.[Character's Name] = [Character's Name] AND Movie = t1.Movie) < (SELECT COUNT([Planet's Name]) FROM TimeTable WHERE t2.[Character's Name] = [Character's Name] and Movie = t2.movie)) [Results of Query H] 1 Luke Skywalker 2 Luke Skywalker 2 R2-D2 3 Luke Skywalker

6. [Query I] SELECT distinct Movie, [Planet's Name] FROM TimeTable t1 WHERE NOT EXISTS ( SELECT * FROM TimeTable t2 WHERE t1.Movie=t2.Movie AND (SELECT COUNT([Character's Name]) FROM TimeTable WHERE t1.[Planet's Name] = [Planet's Name] AND Movie = t1.Movie) < (SELECT COUNT([Character's Name]) FROM TimeTable WHERE t2.[Planet's Name] = [Planet's Name] and Movie = t2.movie)) [Results of Query I] 1 Tatooine 2 Bespin 3 Tatooine [Query J] SELECT distinct t.Movie,C.Race, C.[Name] FROM TimeTable t,Characters C WHERE C.Name = t.[Character's Name] AND NOT EXISTS( SELECT * FROM TimeTable t1,Characters C1 WHERE C.Race = C1.Race AND t.Movie=t1.Movie AND( SELECT SUM(t2.[Time of Departure]-t2.[Time of Arrival]+1) FROM TimeTable t2 WHERE t.[Character's Name] = C.Name AND C.Name = t2.[Character's Name] AND t.Movie=t2.Movie ) < (SELECT SUM(t3.[Time of Departure]-t3.[Time of Arrival]+1) FROM TimeTable t3 WHERE t1.[Character's Name] = C1.Name AND C1.Name=t3.[Character's Name] AND t.Movie = t3.Movie ) );

7. [Results of Query J] 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 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 distinct t.[Planet's Name] FROM TimeTable t WHERE t.[Planet's Name]NOT IN( SELECT t1.[Planet's Name] FROM TimeTable t1 WHERE (t1.Movie = 1 OR t1.Movie = 2)); [Results of Query K] Endor