Relational Model Introduction - E-Courses

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Referential Integrity Constraint (RIC) - Example COURSE DEPARTMENT courseId name credits deptNo CS635 ALGORITHMS 3 1 CS636 A.I 4 1 ES456 D.S.P 3 2 ME650 AERO DYNAMIC CE751 MASS TRANSFER 3 3 3 4 Prof P Sreenivasa Kumar Department of CS&E, IITM deptId name hod phone 1 2 3 COMPUTER SCIENCE ELECTRICAL ENGG. MECHANICAL ENGG. CS01 22576235 ES01 22576234 ME01 22576233 The new course refers to a non-existent department and thus violates the RIC 12
Example <strong>Relational</strong> Scheme student (rollNo, name, degree, year, sex, deptNo, advisor) Here, degree is the program ( B Tech, M Tech, M S, Ph D etc) for which the student has joined. Year is the year of admission and advisor is the EmpId of a faculty member identified as the student’s advisor. department (deptId, name, hod, phone) Here, phone is that of the department’s office. professor (empId, name, sex, startYear, deptNo, phone) Here, startYear is the year of joining of the faculty member in the department deptNo. Prof P Sreenivasa Kumar Department of CS&E, IITM 13
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: Referential Integrity Constraint (R
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 and 30: Theta join • Let r 1 - relation w
Page 31 and 32: Examples For each department, find
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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