NULLIF() - NULL on Equal Values
Q
How to generate NULL with equal values using the NULLIF() function?
✍: FYIcenter.com
A
NULLIF(val1, val2) is a MySQL built-in function that
returns NULL if the first argument equals the second,
the first argument otherwise.
For example:
SELECT NULLIF('yes', 'yes'), NULLIF('yes', 'no');
-- +----------------------+---------------------+
-- | NULLIF('yes', 'yes') | NULLIF('yes', 'no') |
-- +----------------------+---------------------+
-- | NULL | yes |
-- +----------------------+---------------------+
Reference information of the NULLIF() function:
NULLIF(val1, val2): val Returns NULL if the first argument equals the second, the first argument otherwise. Arguments, return value and availability: val1, val2: Required. The values to be selected from. val: Return value. NULL if val1=val2, val1 otherwise. Available since MySQL 4.0.
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2023-12-19, 1234🔥, 0💬
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