How to use NULL/NOT NULL Constraints in SQL || SQL NULL/NOT NULL Constraints || SQL NULL/NOT NUL
In this course we will try to know about the NULL/NOT NULL Constraints in SQL
SQL Constraints-NULL/NOT NULL:
By default, a column can hold NULL values.
The NOT NULL constraint enforces a column to NOT accept NULL values.
CREATE TABLE Table_Name (
Column_Name1 Type NULL,
Column_Name2 Type NOT NULL
);
Let's take a look in sql server query window....
SQL Command:
CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255) NOT NULL,
Age int
);
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