Master Hibernate and JPA with Spring Boot in 100 Steps - Step 49 - JPA Inheritance Hierarchies and Mappings - How to Cho

The video tutorial discusses various strategies for mapping inheritance class relationships to database tables. It covers four main strategies: single table, table per class, joined, and mapped super class. Each strategy is explained with its advantages and disadvantages. The tutorial emphasizes the importance of choosing the right strategy based on data integrity and performance needs. The single table strategy is recommended for performance, while the joined strategy is preferred for data integrity. The tutorial concludes by advising viewers to evaluate their specific scenarios to select the most suitable approach.

What is a major drawback of using the single table strategy for mapping inheritance relationships?

• It requires complex joins for data retrieval.

• It leads to data redundancy across tables.

• It does not support inheritance relationships.

• It compromises data integrity due to nullable columns.

In the table per class strategy, what is a significant issue that arises?

• Complex joins are required for data retrieval.

• Inheritance relationships are not supported.

• Data integrity is compromised due to nullable columns.

• Common columns are repeated across tables, leading to redundancy.

How does the joined strategy improve data integrity?

• By storing all data in a single table.

• By eliminating the need for joins in data retrieval.

• By using foreign keys to link tables and avoid data duplication.

• By creating separate tables for each subclass without common columns.

What is a key characteristic of the mapped superclass strategy?

• It uses a single table with a distinguisher column.

• It requires separate queries for each class to retrieve data.

• It combines all class data into one table for performance.

• It uses foreign keys to link subclass tables.

Which strategy is recommended when data integrity is the highest concern?

• Single table strategy

• Mapped superclass strategy

• Table per class strategy

• Joined strategy