We cannot insert invalid data into the foreign key column as the FOREIN KEY constraint prevents that because the data must be exist in the primary key column on the another table it points to.

The table with the foreign key is called the child table, and the table with the primary key is called the referenced or parent table. # Examples to understand FOREIGN KEY Constraints in MySQL. First, ...

Creating a foreign key relationship between two tables in a MySQL database using Python is a relatively straightforward process. The following example code will create a foreign key relationship ...