ists two values for that column, although it only indexes one column only.
	This is because it implicitly includes the PRIMARY key for that table (as with all InnoDB keys). However, in <i>innodb_index_rows</i> only the explicitly indexed columns are listed.</li>
	<li>The <i>idx_fk_film_id</i> index provides with <strong>5</strong> rows per <strong>film_id</strong> value (this is of course an average estimation).</li>
	<li>The <i>idx_store_id_film_id</i> key is a compound index over two columns. If we use th