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NULLIF() - NULL on Equal Values
How to generate NULL with equal values using the NULLIF() function?
✍: FYIcenter.com
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, 316🔥, 0💬
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