FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -The foreign key here signifies the data or information category in a specific table, that is indicated in the new table as the primary key column. Thus the, the foreign key helps to determine the relationship among tables.

Detailed explanation-2: -A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables to control the data that can be stored in the foreign key table.

Detailed explanation-3: -A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table. In order to add a row with a given foreign key value, there must exist a row in the related table with the same primary key value.

Detailed explanation-4: -The primary key uniquely identifies a record in the table. A foreign key is a field in the table that is the primary key in another table. Primary Key can’t accept null values. A foreign key can accept multiple null values.

Detailed explanation-5: -Foreign Key is used to establish relationships between two tables. A foreign key will require each value in a column or set of columns to match the Primary Key of the referential table. Foreign keys help to maintain data and referential integrity.