Syntax: <br \> <div class='sql'> <pre> FROM <i>component_reference</i> [[LEFT | INNER] JOIN <i>component_reference</i>] ... </pre> </div> The FROM clause indicates the component or components from which to retrieve records. If you name more than one component, you are performing a join. For each table specified, you can optionally specify an alias. <br \><br \> <li \> The default join type is <i>LEFT JOIN</i>. This join can be indicated by the use of either 'LEFT JOIN' clause or simply ',', hence the following queries are equal: <div class='sql'> <pre> SELECT u.*, p.* FROM User u LEFT JOIN u.Phonenumber SELECT u.*, p.* FROM User u, u.Phonenumber p </pre> </div> <li \><i>INNER JOIN</i> produces an intersection between two specified components (that is, each and every record in the first component is joined to each and every record in the second component). So basically <i>INNER JOIN</i> can be used when you want to efficiently fetch for example all users which have one or more phonenumbers. <div class='sql'> <pre> SELECT u.*, p.* FROM User u INNER JOIN u.Phonenumber p </pre> </div>