Tutorial Introduction to SQL; Description This tutorial provides an introduction to the Structured Query Language (SQL), learn how to create tables with primary keys, columns, constraints, indexes, and foreign keys. Tags create table, create, select, inse

Constraints are the rules that we can apply on the type of data in a table. That is, we can specify the limit on the type of data that can be stored in a particular column in a table using constraints. The available constraints in SQL are: NOT NULL: This

The column level constraints are applied only to one column, whereas the table level constraints are applied to the whole table. Following are some of the most commonly used constraints available in SQL. These constraints have already been discussed in SQ