46

mysql order by 优化

 2年前 阅读数 50
以下为 快照 页面,建议前往来源网站查看,会有更好的阅读体验。
原文链接: https://juejin.im/post/5b49ba926fb9a04fc436b1b4
version : 5.7, from 8.2.1.14 ORDER BY Optimization 本节描述MySQL何时可以使用索引来满足ORDER BY子句,当不能使用索引时使用filesort,以及优化器中有关ORDER BY的执行计划信息。 一个o

猜你喜欢

  • 89
    • zhongmingmao.me 1年前
    • 快照

    MySQL -- order by

    CREATE TABLE `t` ( `id` INT(11) NOT NULL, `city` VARCHAR(16) NOT NULL, `name` VARCHAR(16) NOT NULL, `age` INT(11) NOT NULL, `addr` VARCHAR(128) DEFAULT NULL, PRIMARY KEY (`id`), KEY `cit...

  • 55
    • zhongmingmao.me 1年前
    • 快照

    MySQL -- order by rand

    目的:随机选择3个单词 CREATE TABLE `words` ( `id` INT(11) NOT NULL AUTO_INCREMENT, `word` VARCHAR(64) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB; DELIMITER ;; CREATE PROCEDURE w...

  • 13
    • 博客园 www.cnblogs.com 6个月前
    • 快照

    Order by 优化

    写在前面 文章涉及到的 customer 表来源于案例库 sakila,下载地址为 http://downloads.mysql.com/docs/sakila-db.zip MySQL 排序方式

  • 98

    The Honor View 10 will be on pre-sale in the US between March 12 and March 22, with shipments beginning March 22. It will be available for pre-order in Navy Blue and Midnight Black colors for $499 starting March 12 at Honor's website.

  • 68

    Pre-order Z-index

    Z-index is a small app for Mac and Windows which plays web videos on top of other apps.

  • 50

    The single most important quality in a piece of software is simplicity. It’s more important than doing the task you set out to achieve. It’s more important than performance. The reason is straightforward: if your solution...

  • 52

    Improving Connectomics by an Order of Magnitude 2018-07-17

  • 44

    The Asus ZenFone 5Z, Asus' latest flagship, is heading to the U.S. next month. The 6.2-inch, notch-toting handset, can be pre-ordered now on Amazon now for $499.

  • 56
    • www.samsung.com 2年前
    • 快照

    Pre-order | Samsung Galaxy Note9

    Samsung Galaxy Note9 is available for pre-order today. Experience the most powerful battery performance yet, larger storage, and the first-ever Bluetooth®-enabled S Pen. Available with a special bundle promotion, get yours today with and withou...

  • 54

    In my daily experience I have come to notice programmers that have very different ideas on programming. In practice I’d usually recognize two hostile groups among programmers. One group would always be...

关于极客头条


聚合每日国内外有价值,有趣的链接。

AD