SQL Query Optimization and View Creation Quiz

Test your SQL knowledge: views, optimization, joins, subqueries, indexes, and more. Boost your database skills!

Practice Learn Test

Which keyword is used to create a view in SQL?

CREATE VIEW

DEFINE VIEW

VIEW AS

GENERATE VIEW

What is the primary purpose of SQL query optimization?

To minimize the query execution time

To maximize the number of queries

To optimize the storage space

To improve data security

Which SQL function is used to find the maximum value in a column?

MAX()

TOP()

MAXIMUM()

LARGEST()

What is the purpose of a SQL index?

To define primary keys

To enforce referential integrity

To improve the performance of queries

To store data in a structured format

Which SQL statement is used to update data in a database?

MODIFY

ALTER

UPDATE

CHANGE

Which SQL keyword is used to specify the order of the result set?

ORDER BY

SORT BY

GROUP BY

ARRANGE BY

In SQL, which type of join returns all rows from both tables, joining records where available?

INNER JOIN

OUTER JOIN

LEFT JOIN

CROSS JOIN

What is a correlated subquery in SQL?

A subquery that is independent of the outer query

A subquery that uses values from the outer query

A subquery that is nested within another subquery

A subquery that returns multiple rows

Which index type in SQL can speed up SELECT queries but may slow down data modification operations?

Clustered index

Non-clustered index

Composite index

Full-text index

#10

What does ACID stand for in the context of database transactions?

Atomicity, Consistency, Isolation, Durability

Accuracy, Consistency, Isolation, Durability

Atomicity, Cohesion, Isolation, Durability

Accuracy, Consistency, Isolation, Destruction

#11

Which SQL clause is used to limit the number of rows returned by a query?

FILTER

LIMIT

RESTRICT

ROW LIMIT

#12

What is SQL injection?

A method to insert comments into SQL queries

A technique to manipulate a database by injecting malicious SQL code

A feature in SQL to inject additional data into a table

A method to optimize SQL queries

#13

In SQL, what is the purpose of the HAVING clause?

To filter rows before grouping

To specify conditions on groups

To filter rows after grouping

To specify conditions on individual rows

#14

What is a scalar subquery in SQL?

A subquery that returns multiple columns

A subquery that returns a single value

A subquery that is independent of the outer query

A subquery that is nested within another subquery

#15

What is a derived table in SQL?

A table that is inherited from another table

A table created temporarily within the scope of a query

A table with computed columns

A table used for storing historical data