ISNULL() - Detecting NULL Value
Q
How to detect a NULL value using the ISNULL() function?
✍: FYIcenter.com
A
ISNULL(val) is a MySQL built-in function that
returns 1 if the given value is NULL, 0 otherwise.
For example:
SELECT ISNULL(1+1); -- +-------------+ -- | ISNULL(1+1) | -- +-------------+ -- | 0 | -- +-------------+ SELECT ISNULL(1/0); -- +-------------+ -- | ISNULL(1/0) | -- +-------------+ -- | 1 | -- +-------------+
Reference information of the ISNULL() function:
ISNULL(val): boolean Returns TRUE, if and only if the argument is NULL. Arguments, return value and availability: val: Required. The value to be examined. boolean: Return value. TRUE, if and only if the argument is NULL. Available since MySQL 4.0.
⇒ LEAST() - Finding the Least/Minimum Value
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2023-12-17, 266🔥, 0💬
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