SQL SERVER - Altering Column - From NULL to NOT NULL - SQL Authority with Pinal...
source link: https://blog.sqlauthority.com/2021/07/13/sql-server-altering-column-from-null-to-not-null/?utm_campaign=sql-server-altering-column-from-null-to-not-null
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SQL SERVER – Altering Column – From NULL to NOT NULL
Let us see a very simple script today. It is about Altering Column – From NULL to NOT NULL. I recently had to perform this task for my client during the Comprehensive Database Performance Health Check.
Well, the process of updating the column from null to not null is very straight forward but lots of people often get an error and are not able to move forward because they try to make convert the column which only contains null and when they try to convert that to NOT NULL, they face error due to that NULL value.
Here is two steps process to convert NULL to NOT NULL. We will assume that we have a column with a data type of VARCHAR and we are trying to convert it to allow NOT NULL Values.
Step 1: Convert all values to NOT NULL
UPDATE TableNameSET ColumnName = ''WHERE ColumnName IS NULLStep 2: Change Column NULL Values
ALTER TABLE TableName ALTER COLUMN ColumnName VARCHAR(100) NOT NULLWell, that’s it. We are done with Altering Column.
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Reference: Pinal Dave (http://blog.SQLAuthority.com)
Pinal Dave is an SQL Server Performance Tuning Expert and independent consultant with over 17 years of hands-on experience. He holds a Masters of Science degree and numerous database certifications.
Pinal has authored 13 SQL Server database books and 40 Pluralsight courses. To freely share his knowledge and help others build their expertise, Pinal has also written more than 5,500 database tech articles on his blog at https://blog.sqlauthority.com.
Pinal is an experienced and dedicated professional with a deep commitment to flawless customer service. If you need help with any SQL Server Performance Tuning Issues, please feel free to reach out at [email protected].
Pinal is also a CrossFit Level 1 Trainer (CF-L1) and CrossFit Level 2 Trainer (CF-L2).
Nupur Dave is a social media enthusiast and an independent consultant. She primarily focuses on the database domain, helping clients build short and long term multi-channel campaigns to drive leads for their sales pipeline.
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