How to use PERIOD_DIFF function in MySQL

PERIOD_DIFF(monthStart, monthEnd)

SELECT PERIOD_DIFF(1601,1603) 
SELECT PERIOD_DIFF(191602,191607) 
SELECT PERIOD_DIFF(1916-02,1916-07) 
SELECT PERIOD_DIFF(1602,9002)

-> -2
-> -5
-> 5
-> 312

This function returns the number of months between monthStart - monthEnd

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