A database relationship is a connection between two or more database tables that are based on the data each contains. The relationship can be created between two tables through common data, known as a key. The key is a type of column in a table that allows a link to data in another table.

There are three types of database relationships:

1. One-to-One: Each row in the first table is linked to no more than one row in the second table. For example, in a school database, each student has only one student ID, and each student ID is assigned to only one person.

2. One-to-Many (or Many-to-One): Each row in the first table is linked to many rows in the second table. For example, a single customer can place many orders, so the relationship between customers and orders is a one-to-many relationship.

3. Many-to-Many: Each row in the first table is linked to many rows in the second table, and vice versa. For example, in a school database, a student can enroll in many courses, and each course can have many students.

These relationships help to organize the data in a logical and coherent manner and also ensure the consistency and integrity of the data.

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A database relationship is a connection between two or more database tables that are based on the data each contains. The relationship can be created between two tables through common data, known as a key. The key is a type of column in a table that allows a link to data in another table.

There are three types of database relationships:

1. One-to-One: Each row in the first table is linked to no more than one row in the second table. For example, in a school database, each student has only one student ID, and each student ID is assigned to only one person.

2. One-to-Many (or Many-to-One): Each row in the first table is linked to many rows in the second table. For example, a single customer can place many orders, so the relationship between customers and orders is a one-to-many relationship.

3. Many-to-Many: Each row in the first table is linked to many rows in the second table, and vice versa. For example, in a school database, a student can enroll in many courses, and each course can have many students.

These relationships help to organize the data in a logical and coherent manner and also ensure the consistency and integrity of the data.

Knowee AI · Accepted Answer

A database relationship is a connection between two or more database tables that are based on the data each contains. The relationship can be created between two tables through common data, known as a key. The key is a type of column in a table that allows a link to data in another table.

There are three types of database relationships:

1. One-to-One: Each row in the first table is linked to no more than one row in the second table. For example, in a school database, each student has only one student ID, and each student ID is assigned to only one person.

2. One-to-Many (or Many-to-One): Each row in the first table is linked to many rows in the second table. For example, a single customer can place many orders, so the relationship between customers and orders is a one-to-many relationship.

3. Many-to-Many: Each row in the first table is linked to many rows in the second table, and vice versa. For example, in a school database, a student can enroll in many courses, and each course can have many students.

These relationships help to organize the data in a logical and coherent manner and also ensure the consistency and integrity of the data.

What is a database relationship?

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