Express R S ((Left outer join) using a subset of the following relational algebra operations (Project, Select, Rename, Union. Intersection, Set Difference, Cartesian product, Join (conditional or natural)). Explain your assumptions, if any. We assume that attributes of S is denoted as ATTR(S), attributes of R is denoted as ATTR(R) and (ATTR(R)-ATTR(S) denotes a set of attributes in R that does not belong to S. We also use the notation Mal, a2, a3... an (NULL) to denote a relation M with attributes (al, a2, a3, ..an) with one tuple whose values are null for all attributes. For example M id, name (NULL) will be Id Null Name Null
Express R S ((Left outer join) using a subset of the following relational algebra operations (Project, Select, Rename, Union. Intersection, Set Difference, Cartesian product, Join (conditional or natural)). Explain your assumptions, if any. We assume that attributes of S is denoted as ATTR(S), attributes of R is denoted as ATTR(R) and (ATTR(R)-ATTR(S) denotes a set of attributes in R that does not belong to S. We also use the notation Mal, a2, a3... an (NULL) to denote a relation M with attributes (al, a2, a3, ..an) with one tuple whose values are null for all attributes. For example M id, name (NULL) will be Id Null Name Null
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Question 2:
Express RAS ((Left outer join) using a subset of the following relational algebra operations
(Project, Select, Rename, Union, Intersection. Set Difference, Cartesian product, Join
(conditional or natural)). Explain your assumptions, if any.
We assume that attributes of S is denoted as ATTR(S), attributes of R is denoted as
ATTR(R) and (ATTR(R)-ATTR(S) denotes a set of attributes in R that does not belong to
S. We also use the notation M al, a2, a3, an (NULL) to denote a relation M with attributes (al, a2,
a3, ..an) with one tuple whose values are null for all attributes. For example Mid, name (NULL)
will be
Id
Null
Name
Null
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