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Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900

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BuyFindarrow_forward

Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900
Chapter 7, Problem 14RQ
Textbook Problem
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What is a correlated subquery? Give an example.

Program Plan Intro

Subquery:

Any SQL query can be written in the sub query approach.

  • The SQL subquery returns one or more column as the result.
    • Most SQL systems return a pair wise joining of one and only one column in an inner query with one column of an outer query.
    • The data displayed form the table referenced in outer query only.

Explanation of Solution

Correlated subquery: It is a subquery that depends on the outer query. Here, the “WHERE” clause of the correlated subquery uses the information of the outer query.

Processing order of correlated sub queries:

  • The inner query is computed for each outer row in the processing order of correlated sub query.
    • First, the outer sub query will get executed and it returns the result.
    • Based on the result of the outer query, the inner subquery will be evaluated (i.e. the subquery will use the value of the outer query).

Example:

Creating table:

CREATE TABLE EMPLOYEE(NUMBER INT, NAME VARCHAR(15), SALARY INT, DEPARTMENT VARCHAR(10));

Inserting values:

INSERT...

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Chapter 7 Solutions

Database Systems: Design, Implementation, & Management
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