Create, Alter, Drop Not Null constraint in SQL Server - Part 10 Tamil
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SQL Server Tutorial in Tamil : • SQL Server Tutorial in Tamil
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SQL Server Tutorial : • SQL Server Tutorial
SQL Server Concepts : • SQL Server Concepts
SQL Server Analytic Functions : • SQL Server Analytic Functions
NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with a NULL value is a field with no value. NULL value is different than a zero value or a field that contains spaces
By default, a column can hold NULL values. 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
By default, a column can hold NULL values. 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
Explained in Tamil