Master Hibernate and JPA with Spring Boot in 100 Steps - Step 45 - JPA Inheritance Hierarchies and Mappings - Single Tab

The video tutorial explains the single table inheritance strategy for mapping inheritance relationships to tables. It demonstrates how both part-time and full-time employees can be stored in a single table using this strategy. The tutorial highlights the performance benefits of this approach, as it requires only a simple select query. However, it also discusses potential data integrity issues due to nullable columns. The video further explains the use of a discriminator column to distinguish between different employee types.

What is the default strategy used for mapping inheritance relationships to tables?

• Joined Table

• Single Table

• Table per Class

• None of the above

In the demo application, how many tables are used to store both part-time and full-time employees?

• Three tables

• One table

• Four tables

• Two tables

What is a major advantage of using the single table strategy?

• Security

• Complexity

• Performance

• Data integrity

What is a potential issue with the single table strategy regarding data integrity?

• Nullable columns

• Complex queries

• Data redundancy

• Too many tables

What is the purpose of the discriminator column in the single table strategy?

• To manage database connections

• To store employee names

• To distinguish between different types of employees

• To calculate salaries

How can the name of the discriminator column be customized?

• By using the @Column annotation

• By using the @Table annotation

• By using the @Entity annotation

• By using the @DiscriminatorColumn annotation

What happens to the discriminator column when the application is restarted with a new name?

• It remains unchanged

• It is deleted

• It is duplicated

• It is renamed to the new name