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Database Design Concepts

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Questions and Answers

What is the purpose of the INSERT statement in SQL?

To remove rows from a table

To insert data into a table (correct)

To grant access privileges to a database user

To update the values of a column in a table

When using DML commands in SQL, what does the COMMIT command do?

Save all the transactions to the database (correct)

Revoke permissions from users

Undo transactions that have not been saved

Update the values of columns

Which SQL command is used to remove rows from a table?

REVOKE

UPDATE

DELETE (correct)

SELECT

What is the purpose of the DCL command 'Revoke' in SQL?

Remove access privileges from a database user Signup and view all the answers

In SQL, what type of commands can be controlled by TCL commands?

Data Manipulation Language (DML) commands Signup and view all the answers

What is the purpose of the SAVEPOINT command in SQL?

Roll back the transaction to a specific point Signup and view all the answers

'Grant' and 'Revoke' are examples of commands in which category of SQL commands?

'Grant' and 'Revoke' are DCL commands Signup and view all the answers

'SELECT' command in SQL is used for which purpose?

Fetch data from the database Signup and view all the answers

'Rollback' command in SQL is used for what purpose?

'Rollback' is used to undo transactions not saved to the database Signup and view all the answers

What does an entity represent in a database management system?

A real-world object or concept like a person or place Signup and view all the answers

How are attributes typically represented in an ER diagram?

As ovals connected to entities Signup and view all the answers

In an ER diagram, how are relationships between entities depicted?

As diamond shapes Signup and view all the answers

What is the primary function of a primary key in an ER diagram?

To uniquely identify each entity record Signup and view all the answers

How does an ER diagram help in database management?

By visually representing entity sets and their relationships Signup and view all the answers

Which symbol is typically used to represent an attribute in an ER diagram?

Oval connected to an entity Signup and view all the answers

What is the main purpose of an ER diagram in database design?

To visually represent relationships among entities Signup and view all the answers

Which component of an ER Diagram represents a real-world object or concept?

Entity Signup and view all the answers

What does a Primary Key serve as in an ER diagram?

A unique identifier for each record in an entity Signup and view all the answers

In an ER diagram, how are relationships between entities usually depicted?