code: public boolean dropColumn (Connection conn, String table, String column) throws SQLException
      {
          if (!tableContainsColumn(conn, table, column)) {
              return false;
          }
          executeQuery(conn, "ALTER TABLE " + tableSQL(table) + " DROP COLUMN " + columnSQL(column));
          log("Database column '" + column + "' removed from table '" + table + "'.");
          return true;
      }
docs: from DatabaseLiaison