If there is no foreign key with the same name as the primary table name, the primary table name is assigned as the role name. If the primary table name is already being used by another foreign key, the role name is the primary table name concatenated with a zero-padded three-digit number unique to the foreign table. The parent key columns named in the foreign key constraint do not exist, or; The parent key columns named in the foreign key constraint are not the primary key of the parent table and are not subject to a unique constraint using collating sequence specified in the CREATE TABLE, or
SQLite Foreign Key Constraint. In SQLite, FOREIGN KEY Constraint is used to maintain the relationship between multiple tables and it helps us to identify records uniquely Generally, the Foreign Key column in one table becomes a Primary Key constraint in another table to maintain the relationship between tables. SQLite Foreign Keys. SQLite Foreign Key is used to specify that values in one table also appear in another table. It enforces referential integrity within SQLite database. The referenced table is known as parent table while the table with the foreign key is known as child table. The foreign key in the child table will generally reference a ...
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