In a relational database, a data object relational child refers to a record in a table that has a relationship with another table, specifically referencing the "parent" record. This relationship is often called a parent-child relationship or a foreign key relationship.

Here's a breakdown of the concept:

• Tables: Data in a relational database is organized into tables, where each table holds information about a specific entity (e.g., customers, orders, products).

• Child Table: The child table holds more specific data related to the data in the parent table.

• Foreign Key: The child table has a column called a foreign key, which references the primary key of the parent table. This foreign key creates the link between the two tables.

Essentially, the child table provides more details or additional information about the data stored in the parent table.

Here's the same example from before to illustrate:

• Parent Table: Customers (primary key: customer_id)

  • customer_id (integer)

  • customer_name (text)

  • email (text)

• Child Table: Orders (foreign key: customer_id references Customers.customer_id)

  • order_id (integer)

  • customer_id (integer) -- Foreign Key

  • order_date (date)

  • total_amount (decimal)

In this example, the Orders table is the child table. It has a foreign key (customer_id) that references the primary key (customer_id) of the parent table (Customers). This allows us to associate each order with a specific customer  in the database.

Here are some key points about data object relational children:

• Provides More Detail: Expands on the information stored in the parent table.

• Foreign Key Dependency: Relies on the parent table for its data integrity. Changes in the parent table might affect the child table.

• Examples: Child tables can represent things like order details for a customer (Orders table referencing Customers table), blog comments for a specific blog post (Comments table referencing Posts table), or student grades for a particular course (Grades table referencing Courses table).