code: public static Number numberFromSql(String sql, Object... args)
      {
          return SqlClosure.sqlExecute(c -> numberFromSql(c, sql, args));
      }
docs: Get a single Number from a SQL query, useful for getting a COUNT(), SUM(), MIN/MAX(), etc.
  from a SQL statement.  If the SQL query is parametrized, the parameter values can
  be passed in as arguments following the {@code sql} String parameter.
  
  @param sql a SQL statement string
  @param args optional values for a parametrized query
  @return the resulting number or {@code null}