I think Zack properly answered the question but just to cover all the bases:
CopyUpdate myTable set MyColumn = NULL
This would set the entire column to null as the Question Title asks.
To set a specific row on a specific column to null use:
CopyUpdate myTable set MyColumn = NULL where Field = Condition.
This would set a specific cell to null as the inner question asks.
Answer from Jeff Martin on Stack OverflowW3Schools
w3schools.com › sql › sql_null_values.asp
SQL NULL Values - IS NULL and IS NOT NULL
SELECT CustomerName, ContactName, Address FROM Customers WHERE Address IS NULL; Try it Yourself » · Tip: Always use IS NULL to look for NULL values. The IS NOT NULL operator is used to test for non-empty values (NOT NULL values).
Top answer 1 of 6
460
I think Zack properly answered the question but just to cover all the bases:
CopyUpdate myTable set MyColumn = NULL
This would set the entire column to null as the Question Title asks.
To set a specific row on a specific column to null use:
CopyUpdate myTable set MyColumn = NULL where Field = Condition.
This would set a specific cell to null as the inner question asks.
2 of 6
239
If you've opened a table and you want to clear an existing value to NULL, click on the value, and press Ctrl+0.
sql - Set default value in query when value is null - Stack Overflow
I'm running a really simple query, however for some of the results the value in one field is null. How can I set that value to "a string" if its value is null? Something like SELECT RegName, More on stackoverflow.com
Assigning Null value to the variable – SQLServerCentral Forums
Assigning Null value to the variable Forum – Learn more on SQLServerCentral More on sqlservercentral.com
SQL Query - Adding NULL results to a SELECT query - Stack Overflow
This is my first time using Stack Overflow, so I hope I'm asking this question in the right way. I have 2 SQL queries that I am trying to compare and identify the missing values, although I'm having More on stackoverflow.com
Need some knowledge on NULL and NOT NULL
a null is used for multiple purposes -- for example, not known, not applicable, etc. theoreticians take great joy in debating which uses are valid, and whether they can be substituted by some non-null placeholder suffice to say, a null is used when you don't know what value should go there if you don't want that situation to arise, just make the column NOT NULL and you'll never be able to not insert an actual value More on reddit.com
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14
December 22, 2021Videos
11:40
How To Handle NULL Values In MS SQL Server? - YouTube
02:33
How to Set a Column Value to Null in SQL Server - YouTube
12:19
Learn about NULL values in SQL - learn SQL pt 8 - YouTube
09:13
SQL SERVER||How many ways to insert NULL values into table? - YouTube
02:38
Changing a value in a column to null in MySQL - YouTube
46:17
SQL - NULL VALUES | SQL TUTORIAL - YouTube
GeeksforGeeks
geeksforgeeks.org › sql › how-to-set-a-column-value-to-null-in-sql
How to Set a Column Value to Null in SQL? - GeeksforGeeks
In this article 'How to Set a Column Value to Null in SQL', we have reached to some of the basic conclusions, that are listed below. Use the table name in the UPDATE statement. Put NULL in the column name. To select which rows to update, use ...
Published July 23, 2025
Scaler
scaler.com › home › topics › sql › null value in sql
NULL Value in SQL - Scaler Topics
March 28, 2024 - Suppose Vaibhav reaches out to the firm and tells them that he lost the SIM Card of his contact number. So please mark the Contact Number of Vaibhav as NULL. In the above scenario, we can use the assignment operator = to set Vaibhav's contact ...
SQL Shack
sqlshack.com › working-with-sql-null-values
Working with SQL NULL values
May 19, 2021 - However, we can disable this behavior pattern by using the SET ANSI_NULLS command. By default, this option status is ON but we can disable this option during the session-level so the equals (=) and not equal (<>) comparison operators do not ...
Tutorialspoint
tutorialspoint.com › sql › sql-null-values.htm
SQL - NULL Values
SELECT ID, NAME, AGE, ADDRESS, ... in SQL. To do so, you can use the IS NULL operator in your WHERE clause to filter the rows containing NULL values and then set the new value using the SET keyword....
TutorialsPoint
tutorialspoint.com › article › how-to-set-a-column-value-to-null-in-sql
How to Set a Column Value to Null in SQL?
October 11, 2024 - The result of the above query would be as shown below · You can also set a column value to NULL without using the WHERE clause ? UPDATE Customers SET Gender = NULL; SELECT * FROM Customers;
Wyzant
wyzant.com › resources › ask an expert
How do I set a column value to NULL in SQL Server Management Studio? | Wyzant Ask An Expert
May 10, 2019 - First the column should be null-able, you can right click, edit the table, select the column value you want to make null and press the CTRL + 0 buttons. After that click on any other column, if it is successfully updated, no message would be displayed, otherwise it would show you the error window.
Devart
devart.com › home › how to › how to handle null or empty values in sql server
How to Handle Null or Empty Values in SQL Server
December 19, 2024 - The IS NULL operator in SQL Server checks whether a column or an expression contains a NULL value. The basic query syntax is as follows: SELECT column_names FROM table_name WHERE column_name IS NULL;
GeeksforGeeks
geeksforgeeks.org › sql › sql-null-values
NULL values in SQL - GeeksforGeeks
January 5, 2026 - To do so, we can use the IS NULL operator in the WHERE clause to select the rows with NULL values and then we can set the new value using the SET keyword. Let's suppose that we want to update SSN in the row where it is NULL.
GeeksforGeeks
geeksforgeeks.org › sql server › how-to-set-a-column-value-to-null-in-sql-server
How to Set a Column Value to NULL in SQL Server - GeeksforGeeks
July 23, 2025 - -- 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; ... Explanation: After executing ...
TutorialsCampus
tutorialscampus.com › sql › select-null.htm
SQL Select Null
SELECT * FROM employee_details WHERE manager_id IS NOT NULL; By executing above query, we can get results as shown below - Scenario – Update rows which are having NULL values in a column.
TutorialsTeacher
tutorialsteacher.com › sql › sql-null-value
SQL - NULL Value
To fetch the NULL values from a table, we can use keywords, NULL or NOT NULL. You can not select NULL data of a table by using any comparison operators (e.g. =, !=, >, < ).
LearnSQL.com
learnsql.com › cookbook › how-to-select-null-values-in-sql
How to Select NULL Values in SQL | LearnSQL.com
To select rows with NULL in a given column, use a special operator IS NULL: SELECT EmployeeID, EmployeeName, Salary FROM Employees WHERE Salary IS NULL; ... NULL in SQL is used to indicate a missing or unknown value.
Top answer 1 of 6
45
Use the following:
SELECT RegName,
RegEmail,
RegPhone,
RegOrg,
RegCountry,
DateReg,
ISNULL(Website,'no website') AS WebSite
FROM RegTakePart
WHERE Reject IS NULL
or as, @Lieven noted:
SELECT RegName,
RegEmail,
RegPhone,
RegOrg,
RegCountry,
DateReg,
COALESCE(Website,'no website') AS WebSite
FROM RegTakePart
WHERE Reject IS NULL
The dynamic of COALESCE is that you may define more arguments, so if the first is null then get the second, if the second is null get the third etc etc...
2 of 6
11
As noted above, the coalesce solution is preferred. As an added benefit, you can use the coalesce against a "derived" value vs. a selected value as in:
SELECT
{stuff},
COALESCE( (select count(*) from tbl where {stuff} ), 0 ) AS countofstuff
FROM
tbl
WHERE
{something}
Using "iif" or "case" you would need to repeat the inline whereas with coalesce you do not and it allows you to avoid a "null" result in that return...
Database Journal
databasejournal.com › home › features
Working with NULL Values in SQL | DatabaseJournal.com
March 9, 2023 - For instance, if we want to query data that contains NULL values, we can use the IS NULL or IS NOT NULL keywords. Let’s say we want to select every employee from the employees table who do not have a phone number; in this instance, we would ...
SQLServerCentral
sqlservercentral.com › forums › topic › assigning-null-value-to-the-variable
Assigning Null value to the variable – SQLServerCentral Forums
August 25, 2008 - Setting a variable to null is as simple as SET @VariableName = NULL · select @col1 = isnull(col1,NULL),@col2 = isnull(col2,null) from table · What are you trying to acheive here? ISNull is a function that returns the first value if the first value is not null and the second value if it is null.
GeeksforGeeks
geeksforgeeks.org › sql › sql-select-null
SQL - SELECT NULL - GeeksforGeeks
July 23, 2025 - Handling NULL values in SQL is essential for accurate data querying and database integrity. Using conditions like IS NULL and IS NOT NULL, along with constraints such as NOT NULL, ensures that we can effectively manage missing data.
DbSchema
dbschema.com › blog › tutorials › sql null values – is null, coalesce, nullif, and common pitfalls | dbschema
SQL NULL Values – IS NULL, COALESCE, NULLIF, and Common Pitfalls | DbSchema
August 22, 2023 - SELECT order_id, revenue / NULLIF(units_sold, 0) AS revenue_per_unit FROM sales; When units_sold is 0, NULLIF converts it to NULL, so the division returns NULL instead of an error.
Top answer 1 of 3
2
Try:
SELECT C.CustomerId, C.CustomerName, C.StatusId, I.AuthorityId
FROM Customer C
LEFT JOIN Identifier I ON I.CustomerId = C.CustomerId and I.AuthorityId = 11
WHERE C.StatusId = 1
ORDER BY C.CustomerName
2 of 3
1
just change JOIN into LEFT JOIN
SELECT C.CustomerId, C.CustomerName, C.StatusId, I.AuthorityId
FROM Customer C
LEFT JOIN Identifier I ON I.CustomerId = C.CustomerId
WHERE C.StatusId = 1
AND I.AuthorityId = 11
ORDER BY C.CustomerName
UPDATE
if you want to change (NULL) value into NULL or whatever word you want to replace, you can you COALESCE
SELECT C.CustomerId, C.CustomerName, C.StatusId, COALESCE(I.AuthorityId, 'whatever')
FROM Customer C
LEFT JOIN Identifier I ON I.CustomerId = C.CustomerId
WHERE C.StatusId = 1
AND I.AuthorityId = 11
ORDER BY C.CustomerName