Relational Model Introduction - E-Courses

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Outer Join Operation (1/2) Theta join, equi-join, natural join are all called inner joins . The result of these operations contain only the matching tuples The set of operations called outer joins are used when all tuples in relation r or relation s or both in r and s have to be in result. There are 3 kinds of outer joins: Left outer join Right outer join Full outer join Prof P Sreenivasa Kumar Department of CS&E, IITM 42
Outer Join Operation (2/2) Left outer join: r s It keeps all tuples in the first, or left relation r in the result. For some tuple t in r, if no matching tuple is found in s then S-attributes of t are made null in the result. Right outer join: r s Same as above but tuples in the second relation are all kept in the result. If necessary, R-attributes are made null. Full outer join: r s All the tuples in both the relations r and s are in the result. Prof P Sreenivasa Kumar Department of CS&E, IITM 43
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 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: More Example Queries Obtain the dep
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

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