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When you set up a database, you will always want certain fields to be filled out in a table. But the user must remember to fill or willfully fill those particular fields. Certain checks or constraints must be incorporated into fields that require data to avoid such issues. The user would be compelled to enter data in those fields where it is required. We refer to this as a Not Null Constraints in SQL.The following paragraphs will teach us about various aspects of these SQL Server Not Null constraints in the following paragraphs.
A column can hold NULL values by default.A column cannot accept null values because of the NOT NULL in SQL.Because this makes a field have to have a value at all times, you can't add a value to it when you add a new record or update an existing one.
Properties of MS SQL Not Null Constraint
Following are the properties of Not Null Constraint in SQL Server
Following are the advantages of not having null constraints in SQL Server
Following are the disadvantages of SQL Not a Null Constraint
CREATE TABLE Persons ( ID int NOT NULL, LastName varchar(255) NOT NULL, FirstName varchar(255) NOT NULL, Age int );
The output is as follows
To develop a NOT NULL constraint on the "Age" column when the "Persons" table already exists, use the following SQL:
ALTER TABLE Persons ALTER COLUMN Age int NOT NULL;
Implementation of SQL Not Null Constraint using SQL Server Management Studio
We can implement MSSQL Not null constraint using SQL Server Management Studio. The steps are as follows
1) Log in to SQL Server Management Studio.
2) Select The Database and Table, Right-Click, and Select a Design.
SQL Training For Administrators & Developers
In the above few paragraphs, we learned about Not Null Constraint in SQL Server. We discussed its usage, advantage, and disadvantages. We also learned how to implement the Not Null constraint in a table. This can be a starting point for people who want to learn about SQL Server Not Null Constraints.
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