code: public QueryBuilder<T, ID> leftJoin(QueryBuilder<?, ?> joinedQueryBuilder) throws SQLException {
  		addJoinInfo(JoinType.LEFT, null, null, joinedQueryBuilder, JoinWhereOperation.AND);
  		return this;
  	}
docs: Similar to {@link #join(QueryBuilder)} but it will use "LEFT JOIN" instead.
  
  See: <a href="http://www.w3schools.com/sql/sql_join_left.asp" >LEFT JOIN SQL docs</a>
  
  <p>
  <b>NOTE:</b> RIGHT and FULL JOIN SQL commands are not supported because we are only returning objects from the
  "left" table.
  </p>
  
  <p>
  <b>NOTE:</b> This will do combine the WHERE statement of the two query builders with a SQL "AND". See
  {@link #leftJoinOr(QueryBuilder)}.
  </p>