public function dropColumn($columnName) {
        $this->dropColumns[] = $columnName;
        if (array_key_exists($columnName, $this->references)) {
            $this->dropReference($columnName);
        }
        return $this;
    }
public function dropColumn($columnName) {
        $this->dropColumns[] = $columnName;
        if (array_key_exists($columnName, $this->references)) {
            $this->dropReference($columnName);
        }
        return $this;
    }
public function dropColumn ( $ columnName ) { $ this -> dropColumns [ ] = $ columnName ; if ( array_key_exists ( $ columnName , $ this -> references ) ) { $ this -> dropReference ( $ columnName ) ; } return $ this ; }
Removes a column
@param string $columnName
@return Table
Removes a column