Queries

Queries

Professional Development

10 Qs

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Queries

Queries

Assessment

Quiz

Professional Development

Professional Development

Practice Problem

Medium

Created by

Dr. Pasha

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10 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the purpose of query optimization in SQL?

To increase execution time

To reduce execution time and resource usage

To add more indexes to the database

To increase database storage

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

CREATE INDEX idx_city ON Students(City);

Creates a new table named idx_city

Creates an index on the City column of the Students table

Deletes duplicate records from the Students table

Adds a foreign key constraint on the City column

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is a benefit of using indexes in SQL?

Reduces database storage

Speeds up queries that filter data using indexed columns

Makes the database smaller in size

Makes the database smaller in size

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which SQL statement can be used to check if an index exists on a table?

DESCRIBE INDEX

SHOW INDEX FROM Students;

SELECT * FROM INDEXES;

EXPLAIN INDEX Students;

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What does the EXPLAIN statement do in SQL?

Drops an index from a table

Displays the execution plan of a query

Creates an optimized query automatically

Removes duplicate rows from a query

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If a table has no indexes, how does SQL search for a record?

Binary search

Full table scan

Hash function lookup

Using a stored procedure

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of index is created by default in MySQL when using CREATE INDEX?

HASH

BTREE

CLUSTERED

FULLTEXT

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