How to check if multiple columns are null in sql

Problem:

You want to select rows with the value in a given column.

Example:

Let's see a table named with the following columns: , , , and . Assume the column allows values.

EmployeeID	EmployeeName	Dept	Salary
1	Jack Russel	Manager	5600
2	Jan Kowalski	HR	null
3	John Doe	HR	4500
4	Mark Russel	Sales	9000
5	Jane Doe	Sales	null

Now, let’s retrieve all records where the column contains values.

Solution:

To select rows with in a given column, use a special operator :

SELECT EmployeeID, EmployeeName, Salary FROM Employees WHERE Salary IS NULL;

Here’s the result of the query:

EmployeeID	EmployeeName	Salary
2	Jan Kowalski	null
5	Jane Doe	null

Discussion:

in SQL is used to indicate a missing or unknown value.

is special: it is different from all other values, including zero and an empty text field.

How to check if any column has null value in sql

To test for values specifically in SQL, you must use a special operator . It is impossible to test for the value using any of the usual comparison (such as or ) operators. A comparison with using a regular comparison operato

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