How many relations may exist between tables in databases?

In databases, the number of relations that may exist between tables is typically categorized into three main types: one-to-one, one-to-many, and many-to-many. In a one-to-one relationship, a record in one table corresponds to a single record in another table. In a one-to-many relationship, a record in one table can correspond to multiple records in another table. Many-to-many relationships involve a scenario where multiple records in one table relate to multiple records in another, often requiring a junction table to manage the associations.