# parse $OptGroupBy to $GroupBy, create ORDER BY clause $SQLOrderClause
# if $OptGroupBy is still not set, SQLSortOrder() will default to 'month'
my ($GroupBy,$SQLOrderClause) = SQLSortOrder($OptGroupBy, $OptOrderBy);
# parse $OptGroupBy to $GroupBy, create ORDER BY clause $SQLOrderClause
# if $OptGroupBy is still not set, SQLSortOrder() will default to 'month'
my ($GroupBy,$SQLOrderClause) = SQLSortOrder($OptGroupBy, $OptOrderBy);