Understanding and Managing Database Relationships
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Relational databases allow for the storing and retrieval of interconnected data elements. Relational databases are built on the relational model, an easy-to-understand technique for displaying data in tables. In a relational database, each table row is a record with a unique ID called the key. The columns of the table display the qualities of the data, and since each record usually includes a value for each property, it is easy to find the relationships between the data points.
Let's try to understand relationships in the database and we are going to use PostgreSQL for SQL Statement.
One-to-One Relationship:
A one-to-one relationship in PostgreSQL signifies a unique link between one record in a table to exactly one record in another table.
In simple words, a One-to-One relationship is like a link between two tables of data in which each record occurs only once in each table.
