In this case, the MySQL INTERVAL() function returns the index number of the last number in the parameter list plus 1. In other words, adding 1 to the last index number in the list will return this function. The following example will demonstrate it -
mysql> Select INTERVAL(50,20,32,38,40); +--------------------------+ | INTERVAL(50,20,32,38,40) | +--------------------------+ | 4 | +--------------------------+ 1 row in set (0.00 sec)
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