How to ALTER a Column from Null to NOT Null in SQL Server ?

Published on August 20, 2016 by abundantcode

Filed under SQL Server

Last modified August 20, 2016

Print this page

rate 1 star rate 2 star rate 3 star rate 4 star rate 5 star
Your rating: none, Average: 0 (0 votes)

This article have been viewed 346 times

Assume a scenario where you have a table that contains columns which are Nullable integer column. You might want to update them to NOT NULL column (adding NOT NULL constraint) and set its value to zero.

How to ALTER a Column from Null to NOT Null in SQL Server ?

This would be a two step process where you should first update the column values to 0 and then write a Data Definition Language (DDL) to alter the column of the table.

Assuming the table Name is "Employee" and the field is LeavesTaken, this is how both the queries would look like.

UPDATE Employee SET LeaveTaken=0 WHERE LeaveTaken IS NULL

The ALTER table query would look like this.

If you enjoyed this post, please consider leaving a comment or subscribing to the RSS feed to have future articles delivered to your feed reader.

Leave a Comment


You might be Interested in these Posts

How to Perform Inner Join using LINQ in C# ?

Are you looking for the syntax on how to perform inner join using LINQ in C# ? . Below is a sample c...

How to hide the status bar in Microsoft Excel with the VBA Code?

Do you want to hide the status bar in Microsoft Excel ?. You can use the VBA code to do it quickly. ...

Displaying all the worksheet names in Excel using VBA Code

Do you want to display the names of the worksheets in the excel workbook ?. Here;s how you can do it...