SQLite uses a simple integer ID as the primary key for each row in a table. This is different from most other SQL databases which use more complex primary keys (usually made up of multiple columns). SQLite also supports foreign keys which allow you to reference data in other tables. Foreign keys are a powerful way to enforce data integrity and can be used to make sure that data is consistent across multiple tables.A primary key is a column or set of columns in a table that uniquely identify each row in the table. A table can have only one primary key.A foreign key is a column or set of columns in a table that match the primary key of another table. Foreign keys are used to create relationships between tables.SQLite Primary Key: A primary key is a field in a table which uniquely identifies each row/record in a database table. A primary key can be either a single field or multiple fields.SQLite Foreign Key: A foreign key is a field in a table that matches the primary key of another table. The foreign key is used to link two tables together.