When the value of the first parameter (i.e. substring) or the second parameter (i.e. substring) is NULL, it will return NULL as output. The following example will demonstrate it -
mysql> Select LOCATE(NULL,'Ram is a good boy')As Result; +--------+ | Result | +--------+ | NULL | +--------+ 1 row in set (0.00 sec) mysql> Select LOCATE('Ram',NULL)As Result; +--------+ | Result | +--------+ | NULL | +--------+ 1 row in set (0.00 sec)
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