Setting a Column Value to NULL Using UPDATE
This method involves the UPDATE statement to null a particular column value for a given row of the tables. It would be used if you were obliged to either clear or nullify certain column values.
-- The Department is to be updated to null instead of the employee's EmployeeID 101
UPDATE EmployeeDetails
SET Department = NULL
WHERE EmployeeID = 101;
-- Displaying updated data
SELECT * FROM EmployeeDetails;
Output:
Explanation: After executing this method the Department value for that employee with EmployeeID 101 is null. The rest of the data remains the same. It erases the department data associated with that particular employee.
How to Set a Column Value to NULL in SQL Server
In the world of database management, SQL Server is a leading and extensively utilized system. A fundamental task within SQL Server is manipulating data within tables, and setting a column value to NULL is a common operation. Whether it’s for maintaining data integrity, performing updates, or meeting specific business logic requirements, efficiently executing this action is crucial.
In this article, we’ll delve into setting column values to NULL in SQL Server. We’ll cover three methods: utilizing UPDATE statements, employing CASE statements for conditional updates, and concatenating values using CONCAT.
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