What is PRAGMA foreign key?

What does PRAGMA do in SQL?

The PRAGMA keyword is used to signify that the remainder of the PL/SQL statement is a pragma, or directive, to the compiler. Also called apseudoinstruction, a pragma simply passes information to the compiler rather than getting transformed into a particular execution.

What is a foreign key in SQLite?

A foreign key is a way to enforce referential integrity within your SQLite database. A foreign key means that values in one table must also appear in another table. The referenced table is called the parent table while the table with the foreign key is called the child table.

What is foreign key in schema?

A foreign key is a column or group of columns in a table that acts as a constraint. The foreign key enforces that data from one column (referencing) must exist in another column (referenced). Each value of the foreign key column should have a corresponding value in the linked table.

What is PRAGMA table info?

The PRAGMA statement is an SQL extension specific to SQLite and used to modify the operation of the SQLite library or to query the SQLite library for internal (non-table) data.