What Is Not Null in Mysql
The Not Null Constraint Enforces a Column to Not Accept Null Values. This Enforces a Field to Always Contain a Value, Which Means That You Cannot Insert a New...
The NOT NULL constraint enforces a column to NOT accept NULL values. This enforces a field to always contain a value, which means that you cannot insert a new record, or update a record without adding a value to this field.
What is the use of NOT NULL in SQL?
A NOT NULL constraint in SQL is used to prevent inserting NULL values into the specified column, considering it as a not accepted value for that column. This means that you should provide a valid SQL NOT NULL value to that column in the INSERT or UPDATE statements, as the column will always contain data.
WHAT IS NOT NULL value?
The NOT NULL constraint enforces a column to not accept NULL values, which means that you cannot insert or update a record without adding a value to this field.
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