function DropColumnSQL($tabname, $flds, $tableflds='',$tableoptions='')
	{
		$tabname = $this->TableName ($tabname);
		if (!is_array($flds))
			$flds = explode(',',$flds);
		$f = array();
		$s = 'ALTER TABLE ' . $tabname;
		foreach($flds as $v) {
			if ( $constraintname = $this->DefaultConstraintname($tabname,$v) ) {
				$sql[] = 'ALTER TABLE ' . $tabname . ' DROP CONSTRAINT ' . $constraintname;
			}
			$f[] = ' DROP COLUMN ' . $this->NameQuote($v);
		}
		$s .= implode(', ',$f);
		$sql[] = $s;
		return $sql;
	}