First check SQL documentation  Link
<http://zf2.readthedocs.org/en/release-2.0.3/modules/zend.db.sql.html>   It
should make some things clear.

This is join construction (from docs):

$select->join(
     'foo' // table name,
     'id = bar.id', // expression to join on (will be quoted by platform
object before insertion),
     array('bar', 'baz'), // (optional) list of columns, same requiremetns
as columns() above
     $select::JOIN_OUTER // (optional), one of inner, outer, left, right
also represtned by constants in the API
);

This is short example:

$sql = new Sql($this->adapter); 
$select = $sql->select();               
$select->from(array('t' => 'first_table'));
$select->join(array('t2' => 'second_table'),
                't.id = c.table_id',
                array('title','active'),
                'outer');

I hope it helps.



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