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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