文章目录测试数据1 sql执行顺序2 order by 和 group by什么时候会出现Using filesort — 理论3 order by 和 group by什么时候会出现Using filesort — 实践3.1 不会出现 Using filesort的情况 — 符合最佳左前缀法则3.1.1 order by也满足索引最佳左前缀法则的时候3.1.2 where中索引的最左前缀定义为常量的时候 — 其实为3.1.1的特例3.1.3 覆盖索引情况下和非覆盖索引情况下稍微有点区别3.2 会出现 Using filesort的情况3 讨论 — 实际业务中我的order by 就

[LNWX17] Lattice-based group signatures_ Achieving full dynamicity with ease.pdf

[BMW03] Foundations Of Group Signatures.pdf

[BW06] Compact Group Signatures Without Random Oracles.pdf

[BW07] Full-Domain Subgroup Hiding and Constant-Size Group Signatures.pdf

Yahoo Group Archiver 允许您将来自 Yahoo Group 的所有消息存档到您选择的关系数据库中。

The Kimball Group Reader: Relentlessly Practical Tools for Data Warehousing and Business Intelligence Remastered Collection The final edition of the incomparable data warehousing and business intelligence reference, updated and expanded The Kimball Group Reader, Remastered Collection is the essential reference for data warehouse and business intelligence design, packed with best practices, design tips, and valuable insight from industry pioneer Ralph Kimball and the Kimball Group. This Remastered Collection represents decades of expert advice and mentoring in data warehousing and business intelligence, and is the final work to be published by the Kimball Group. Organized for quick navigation and easy reference, this book contains nearly 20 years of experience on more than 300 topics, all fully up-to-date and expanded with 65 new articles. The discussion covers the complete data warehouse/business intelligence lifecycle, including project planning, requirements gathering, system architecture, dimensional modeling, ETL, and business intelligence analytics, with each group of articles prefaced by original commentaries explaining their role in the overall Kimball Group methodology. Data warehousing/business intelligence industry's current multi-billion dollar value is due in no small part to the contributions of Ralph Kimball and the Kimball Group. Their publications are the standards on which the industry is built, and nearly all data warehouse hardware and software vendors have adopted their methods in one form or another. This book is a compendium of Kimball Group expertise, and an essential reference for anyone in the field. Learn data warehousing and business intelligence from the field's pioneers Get up to date on best practices and essential design tips Gain valuable knowledge on every stage of the project lifecycle Dig into the Kimball Group methodology with hands-on guidance Ralph Kimball and the Kimball Group have continued to refine their methods and tech

Final report from the video quality experts group on the validation of objective models of video quality assessment

一个 web 2.0 社区网站，可以部署在任何网络托管服务器上。 这包括一个网络信使和一个博客平台。

c代码-check digit wrght by first single digit and first group of five digits and secand group of five digits