Question
What does the NULLIF function do?
Answers
The NULLIF function is a built-in function in SQL that compares two expressions and returns NULL if they are equal, or the first expression if they are not equal.

Here is the syntax for the NULLIF function:

NULLIF(expression1, expression2)

The expression1 and expression2 arguments can be any valid expressions that evaluate to a single value. The function compares the two expressions, and if they are equal, it returns NULL. If the expressions are not equal, it returns the value of expression1.

Here is an example of how the NULLIF function can be used in a SELECT statement:

Copy code
SELECT NULLIF(quantity, 0) FROM orders;
This statement will return the value of the "quantity" column for each row in the "orders" table, unless the value is 0, in which case it will return NULL.

The NULLIF function can be useful for handling situations where you want to treat certain values as NULL, or for comparing values in a table and returning NULL if they are equal.   Your Comment




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