Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 12, Problem 13RQ
Program Plan Intro
Query optimization functions:
The objective of query optimization functions helps to reduce the costs related to
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Database Systems: Design, Implementation, & Management
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- How can data dictionaries assist in the optimization of query performance?arrow_forwardWhy is it not desirable to force users to make an explicit choice of a queryprocessing strategy? Are there cases in which it is desirable for users tobe aware of the costs of competing query-processing strategies? Explain your answer.arrow_forwardWhat exactly do you mean by "query optimization"?arrow_forward
- What is the difference between scalar function and vector function in SQL DATABASE? Note: Question is based on SQL DATABASE.arrow_forwardConsider the following ER diagram for a social network application.Write the SQL-DDL statements, to create tables for the following ER diagram andcapture as many of the constraints as possible. Specify your decisions with the foreignkey constraints.arrow_forwardWrite 5 queries with explanations for online book store system,(USE MySQL)-- Write 5 queries. Your queries should do a task that is meaningful in online book store system.-- At least one that joins two or more tables-- At least one that include group functions-- At least one with one or more sub-query(es)-- At least one update-- At least one delete-- At least one include arithmetic functions-- At least one uses aliasarrow_forward
- What are the performance implications of heavily nesting SQL functions within a query?arrow_forwardWhat is the idea behind distributed query processing using the semijoin operation? Write your answer with an explanation?arrow_forwardCompare and contrast scalar functions and table-valued functions in SQL. When might you choose one type of function over the other in your database design?arrow_forward
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