If all values in the MySQL COALESCE() function are NULL, it returns NULL as output. This means that the function did not find any non-NULL value in the list.
mysql> Select COALESCE(NULL, NULL, NULL, NULL); +----------------------------------+ | COALESCE(NULL, NULL, NULL, NULL) | +----------------------------------+ | NULL | +----------------------------------+ 1 row in set (0.00 sec)
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