41      * @param string $alias Under whichname to slect the column. blank for column name
43     public function addSelectColumn($tablealias, $column, $alias = '')  argument
45         if ($alias === '') $alias = $column;
49         $this->select[$alias] = "$tablealias.$column";
56      * @param string $alias
64     public function addSelectStatement($statement, $alias)  argument
66         $this->select[$alias] = $statement;
72      * @param string $alias
76     public function getSelectStatement($alias)  argument
78         if (!isset($this->select[$alias])) {
82         return $this->select[$alias];
89      * @param string $alias alias for the table, blank for table name
91     public function addTable($table, $alias = '')  argument
93         if ($alias === '') $alias = $table;
94         if (isset($this->from[$alias])) {
97         $this->from[$alias] = "$table AS $alias";
98         $this->type[$alias] = 'table';
213         foreach ($this->from as $alias => $statement) {
214             if ($this->type[$alias] == 'table' && $from) {
225         foreach ($this->select as $alias => $select) {
226             $selects[] = "$select AS $alias";