Relational Model Introduction - E-Courses

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Professor empId name sex startYear deptNo phone CS01 GIRIDHAR M 1984 1 22576345 CS02 KESHAV MURTHY M 1989 1 22576346 ES01 RAJIV GUPTHA M 1980 2 22576244 ME01 Department TAHIR NAYYAR M 1999 3 22576243 deptId name hod phone 1 Computer Science CS01 22576235 2 Electrical Engg. ES01 22576234 3 Mechanical Engg. ME01 22576233 <strong>Courses</strong> Prof P Sreenivasa Kumar Department of CS&E, IITM courseId cname credits deptNo CS635 Algorithms 3 1 CS636 A.I 4 1 ES456 D.S.P 3 2 ME650 Aero Dynamics 3 3 30
Examples For each department, find its name and the name, sex and phone number of the head of the department. Prof (empId, p-name, sex, deptNo, prof-phone) ← π empId, name, sex, deptNo, phone (professor) Result ← π DeptId, name, hod, p-name, sex, prof-phone (Department ⋈ (empId = hod) ^ (deptNo = deptId) Prof) deptId name hod p-name sex prof-phone 1 Computer Science 2 Electrical Engg. 3 Mechanical Engg. CS01 Giridher M 22576235 EE01 Rajiv Guptha ME01 Tahir Nayyar Prof P Sreenivasa Kumar Department of CS&E, IITM M 22576234 M 22576233 31
Page 1 and 2: Introduction Relational Model Prop
Page 3 and 4: Relation Instance A finite set of
Page 5 and 6: Keys for a Relation (2/2) A relati
Page 7 and 8: Domain and Key Constraints • Doma
Page 9 and 10: Foreign Key - Examples(1/2) Foreign
Page 11 and 12: Referential Integrity Constraint (R
Page 13 and 14: Example Relational Scheme student (
Page 15 and 16: Example Relational Scheme student (
Page 17 and 18: Relational Algebra A set of operat
Page 19 and 20: Selection Condition • Select cond
Page 21 and 22: The project Operator Unary operato
Page 23 and 24: Size of project expression result
Page 25 and 26: Set Operations r 1 - relation with
Page 27 and 28: Example Query using cross product
Page 29: Theta join • Let r 1 - relation w
Page 33 and 34: Examples - Equi-join Find courses o
Page 35 and 36: Division operator The necessary co
Page 37 and 38: Query using division operation Find
Page 39 and 40: Complete Set of Operators • Are a
Page 41 and 42: More Example Queries Obtain the dep
Page 43 and 44: Outer Join Operation (2/2) Left out
Page 45 and 46: Left outer join temp ← (student a
Page 47 and 48: Full outer join temp ← (student a
Page 49 and 50: Relational representation of strong
Page 51 and 52: Example CourseID Name Credits Corre
Page 53 and 54: Handling Binary 1:1 relationship L
Page 55 and 56: Handling 1:N Relationship Let S be
Page 57 and 58: Handling M:N relationship Make a s
Page 59: Handling Recursive relationships M

Relational Model Introduction - E-Courses

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