code: public QueryBuilder<T, ID> join(QueryBuilder<?, ?> joinedQueryBuilder) throws SQLException {
  		addJoinInfo(JoinType.INNER, null, null, joinedQueryBuilder, JoinWhereOperation.AND);
  		return this;
  	}
docs: Join with another query builder. This will add into the SQL something close to " INNER JOIN other-table ...".
  Either the object associated with the current QueryBuilder or the argument QueryBuilder must have a foreign field
  of the other one. An exception will be thrown otherwise.
  
  <p>
  <b>NOTE:</b> This will do combine the WHERE statement of the two query builders with a SQL "AND". See
  {@link #joinOr(QueryBuilder)}.
  </p>