How To Use NOT NULL Constraint In SQL
Database

In this article, we will learn how to use the NOT NULL constraint in SQL.

A column can hold NULL values by default. The NOT NULL constraint is used to enforce a column to NOT accept NULL values.

How To Alter Table Using Query In SQL
Database

In this article, we will learn how to use the ALTER TABLE statement in SQL.

To add or delete or modify columns in an existing table, the ALTER TABLE statement is used.

The ALTER TABLE statement also can be used to add or drop various constraints on an existing table.

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