/**
* Returns SQL query.
* @return string
*/
public function buildSelectQuery()
{
$join = $this->buildJoins(implode(',', $this->conditions), TRUE);
$join += $this->buildJoins(implode(',', $this->select) . ",{$this->group},{$this->having}," . implode(',', $this->order));
$prefix = $join ? "{$this->delimitedTable}." : '';
if ($this->select) {
$cols = $this->tryDelimite($this->removeExtraTables(implode(', ', $this->select)));
} elseif ($prevAccessed = $this->selection->getPreviousAccessed()) {
$cols = array_map(array($this->connection->getSupplementalDriver(), 'delimite'), array_keys(array_filter($prevAccessed)));
$cols = $prefix . implode(', ' . $prefix, $cols);
} elseif ($this->group && !$this->connection->getSupplementalDriver()->isSupported(ISupplementalDriver::SUPPORT_SELECT_UNGROUPED_COLUMNS)) {
$cols = $this->tryDelimite($this->removeExtraTables($this->group));
} else {
$cols = $prefix . '*';
}
return "SELECT{$this->buildTopClause()} {$cols} FROM {$this->delimitedTable}" . implode($join) . $this->buildConditions();
}
