Hence, in this tutorial of the Primary key and Foreign Key in SQL, we learned about the SQL Primary Key and SQL Foreign Key. moreover, we looked at how SQL Create Table Primary Key and SQL Create table Foreign Key. Also, we discussed the Primary Key and F

Key Primary Key Foreign Key; 1: Basic: It is used to uniquely identify data in the table: It is used to maintain relationship between tables: 2: Null: It can’t be null : It can accept the null values: 3: Duplicate: Two or more rows can� ...

A foreign key is a key used to link two tables together. This is sometimes also called as a referencing key. A Foreign Key is a column or a combination of columns whose values match a Primary Key in a different table. The relationship between 2 tables mat