方案1:首先使用索引完成排序分頁操作,最後根據主鍵關聯回原表查詢所需要的其他列內容。
1.普通分頁查詢:
explain select film_id,description from film order by title limit 50,5;
掃瞄了全表,使用了filesort排序;速度很慢;
2.改進分頁查詢:
explain select a.film_id,a.description from film a inner join (select film_id from film order by
title limit 50,5)b on a.film_id=b.film_id;
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