The foreign key field is the linking field on the ""many"" side of the relationship.
"A column (or group of columns) in a table that must have values that match those of a column in another table is known as a foreign key. Referential integrity, which essentially states that if column value A refers to column value B, then column value B must exist, is enforced via FOREIGN KEY constraints."
A column or columns of data in one table that link to the main key data in the original table are known as foreign keys. Foreign keys help define the relationship between tables, which is what puts the "relational" in "relational database."
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