Syntax:
MAX([DISTINCT] expr) [over_clause]

Returns the maximum value of expr. MAX() may take a string argument; in
such cases, it returns the maximum string value. See
https://dev.mysql.com/doc/refman/8.0/en/mysql-indexes.html. The
DISTINCT keyword can be used to find the maximum of the distinct values
of expr, however, this produces the same result as omitting DISTINCT.

If there are no matching rows, or if expr is NULL, MAX() returns NULL.

This function executes as a window function if over_clause is present.
over_clause is as described in
https://dev.mysql.com/doc/refman/8.0/en/window-functions-usage.html; it
cannot be used with DISTINCT.

URL: https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html

