编程语言：SQL
你真的会玩SQL吗？实用函数方法汇总
你真的会玩SQL吗？系列目录你真的会玩SQL吗？之逻辑查询处理阶段你真的会玩SQL吗？和平大使 内连接、外连接你真的会玩SQL吗？三范式、数据完整性你真的会玩SQL吗？查询指定节点及其所有父节点的方法你真的会玩SQL吗？让人晕头转向的三值逻辑你真的会玩SQL吗？EXISTS和IN之间的区别你真的会玩
kingshard架构设计和功能实现
A high-performance MySQL proxy. Contribute to flike/kingshard development by creating an account on GitHub.
Tips for SQL Database Tuning and Performance
Performance tuning SQL Server databases can be tough: Sometimes the smallest change has the biggest impact. Learn the benefits of SQL query tuning and how to optimize your SQL Server database, from…
一个用户SQL慢查询分析，原因及优化
问题描述 一个用户反映线上一个SQL语句执行时间慢得无法接受。SQL语句看上去很简单（本文描述中修改了表名和字段名): SELECT count(*) FROM a JOIN b ON a.S = b.S WHERE a.L > '2014-03-30 00:55:00' AND a.L < '2014-03-30 01:00:00' ; 且查询需要的字段都建了索引，表结构如下：…
动态 SQL
File not found The site configured at this address does not contain the requested file. If this is your site, make sure that the filename case matches the URL as well as any file permissions. For root…