Apply the constraints like Primary Key, Foreign key, NOT NULL to the tables.
Channel: Goeduhub Technologies
Date: 13/01/2021

Complete answer available @ https://www.goeduhub.com/2554/apply-the-constraints-like-primary-key-foreign-null-tables

Apply the constraints like Primary Key, Foreign key, NOT NULL to the tables.
Constraints : SQL constraints are used to specify rules for data in a table.These are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the database.Constraints could be either on a column level or a table level. The column level constraints are applied only to one column, whereas the table level constraints are applied to the whole table.Constraints can be divided into the following two types : 

Column level constraints: Limits only column data.
Table level constraints: Limits whole table data.