Database System Concepts
Database System Concepts
7th Edition
ISBN: 9789332901384
Author: Henry F. Korth & S. Sudarshan Abraham Silberschatz
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 8, Problem 6PE

a.

Explanation of Solution

SQL schema definition

  • Person relation type is considered.

    create type Person (ID integer, name varchar (30), address varchar (50))

    create table person of Person

  • Employee relation type is considered.

    create type Employee under Person (salary integer)

    create table employee of Employee under person

  • Student relation type is considered...

b.

Explanation of Solution

SQL query to find the company with the most employees

Query

select comp -> name from works group by comp having count(person)>= all (select count(person)from works group by comp)

Explanation

  • The “group by” clause is used to group rows that have same values.
  • This query is used to get the company that has most employees.

SQL query to find the company with the smallest payroll

Query

select comp -> name from works group by comp having sum(salary)<= all (select sum(salary)from works group by comp)

Explanation

  • The “group by” clause is used to group rows that have same values...

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