B. Environment Variables : II_DECIMAL
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II_DECIMAL specifies the character used to separate fractional and non-fractional parts of a number. Valid characters are the period (.) (as in 12.34) or the comma (,) (as in 12,34). The default is the period. This variable is set installation-wide.
Note:  If II_DECIMAL is set to comma, be sure that when SQL syntax requires a comma (such as a list of table columns or SQL functions with several parameters), that the comma is followed by a space. For example:
select col1, ifnull(col2, 0), left(col4, 22) from t1: