Database Expert Quiz 9 > Data AI Revolution

Database Expert Quiz 9

This advanced-level database quiz is tailored for experienced learners who want to test their knowledge of complex database concepts and gain insights into professional database management skills. The quiz covers topics beyond basic SQL and relational theory, challenging participants with real-world scenarios and intricate database operations.

1 / 10

In SQL, what is the main purpose of a "HAVING" clause?

To filter rows before any grouping is applied

To filter aggregated data after the GROUP BY clause

To join tables based on a condition

To impose a condition on data without using a WHERE clause

2 / 10

Which of the following is a feature of the Object-Relational Mapping (ORM) approach in database design?

ORM eliminates the need for SQL in application development.

ORM automatically normalizes all tables in the database.

ORM allows for automatic creation of database schema based on object models.

ORM is incompatible with relational database management systems.

3 / 10

In a relational schema, which of the following is true about a foreign key constraint?

It enforces uniqueness in the primary table.

It requires the referencing column(s) to contain only unique values.

It enforces a link between data in two tables, typically between a primary and foreign key.

It prevents the insertion of duplicate records in the referencing table.

4 / 10

Which isolation level in SQL allows a transaction to read uncommitted changes made by other transactions?

Read Committed

Repeatable Read

Serializable

Read Uncommitted

5 / 10

In the context of database indexes, what is a clustered index?

An index that is stored in a separate structure from the data in the table

An index where the logical order of the index matches the physical storage order of the rows

An index that is used exclusively for foreign key columns

An index that allows duplicate values in the column it is indexed on

6 / 10

Which of the following is NOT a property of a transaction in a database management system?

Atomicity

Consistency

Isolation

Efficiency

7 / 10

Which of the following statements best describes a trigger in SQL?

It is a stored procedure that runs automatically when certain events occur in the database.

It is a constraint that restricts data entry in a table. It is a special index that improves query performance.

It is a special index that improves query performance.

It is a system-generated command used to enforce referential integrity.

8 / 10

What is a correlated subquery?

A subquery that is independent of the outer query and executes first

A subquery that uses values from the outer query to complete its execution

A subquery that can return only a single row as output

A subquery used exclusively with aggregate functions

9 / 10

In a relational database, which of the following anomalies is likely to occur if a table is not normalized?

Lossless decomposition

Functional dependency

Insertion, deletion, and update anomalies

Referential integrity

10 / 10

Which of the following statements about database normalization is true?

Denormalization increases redundancy, which may lead to data anomalies.

First Normal Form (1NF) requires that each attribute in a table be atomic and unique.

Third Normal Form (3NF) removes all transitive dependencies and partial dependencies.

Boyce-Codd Normal Form (BCNF) is less strict than 3NF.

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Database Expert Quiz 9

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