protected function dropIndex($indexName) {
        $sql = 'drop index if exists '.
            $this->backtick($indexName);
        $this->query($sql, Db::QUERY_DEFINE);
    }
protected function dropIndex($indexName) {
        $sql = 'drop index if exists '.
            $this->backtick($indexName);
        $this->query($sql, Db::QUERY_DEFINE);
    }
protected function dropIndex ( $ indexName ) { $ sql = 'drop index if exists ' . $ this -> backtick ( $ indexName ) ; $ this -> query ( $ sql , Db :: QUERY_DEFINE ) ; }
Drop an index.

@param string $indexName The name of the index to drop.
Drop an index .