Ramadhan Silas
Feb 13
Database relationship and type?
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Feb 13
Database relationship refers to the association between two or more tables in a database. It defines how the data in one table is related to the data in another table. There are different types of database relationships:
1. One-to-One (1:1) Relationship: In this type of relationship, each record in one table is associated with only one record in another table, and vice versa. For example, a person and their passport information can have a one-to-one relationship.
2. One-to-Many (1:N) Relationship: In this type of relationship, a record in one table can be associated with multiple records in another table, but a record in the second table can only be associated with one record in the first table. For example, a customer can have multiple orders, but each order is associated with only one customer.
3. Many-to-Many (N:N) Relationship: In this type of relationship, multiple records in one table can be associated with multiple records in another table. To represent this relationship, a junction table is used. For example, in a bookstore database, a book can be written by multiple authors, and an author can write multiple books.
The type of database relationship depends on the cardinality and the business logic of the data being modeled.
1. One-to-One (1:1) Relationship: In this type of relationship, each record in one table is associated with only one record in another table, and vice versa. For example, a person and their passport information can have a one-to-one relationship.
2. One-to-Many (1:N) Relationship: In this type of relationship, a record in one table can be associated with multiple records in another table, but a record in the second table can only be associated with one record in the first table. For example, a customer can have multiple orders, but each order is associated with only one customer.
3. Many-to-Many (N:N) Relationship: In this type of relationship, multiple records in one table can be associated with multiple records in another table. To represent this relationship, a junction table is used. For example, in a bookstore database, a book can be written by multiple authors, and an author can write multiple books.
The type of database relationship depends on the cardinality and the business logic of the data being modeled.
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