Syntax:
GET_FORMAT({DATE|TIME|DATETIME}, {'EUR'|'USA'|'JIS'|'ISO'|'INTERNAL'})

Returns a format string. This function is useful in combination with
the DATE_FORMAT() and the STR_TO_DATE() functions.

If format is NULL, this function returns NULL.

URL: https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html

