Basic Concepts
Learn a few basic concepts of database relationships in Spring.
Primary key
A primary key is used to uniquely identify a row in a table. The id column in the player table shown below acts as a unique identifier for all records. No two records can have the same primary key value.
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Representing unique key identifiers
Foreign key
Primary key can be used to link two tables together. When a primary key of one table is used in another table, it is known as a foreign key. To link the player and player_profile tables, the id column from the player_profile table is placed in the player table. The column profile_id is called the foreign key column and is used to point to the record in the player_profile table that is linked to the record in the player table. ...
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