总结group by用法，通过实例演示，加深理解与掌握。 1、 按照指定列的值将表中数据分组，使相同值的数据归为一组，之后对 ...

最近，Oracle 宣布 MySQL 8.2 正式可用，包括对读写分离的支持。这一备受期待的特性已经在最新的创新版本中引入，有助于优化数据库性能和提升可扩展性。 读写分离使应用程序能够将所有写入流量定向到读写（主要或源）实例，将所有读取流量定向到只读实例 ...

Faithful pen open letter proposing independent foundation with or without Big Red's participation A group of influential users and developers of MySQL have invited Oracle to join their plans to create ...

One of original authors of MySQL, Michael 'Monty' Widenius, has founded the Open Database Alliance, a consortium that aims to become the industry hub for the open source database. The move was ...

Obviously the limit is part of the problem. Since this is a 3-day period, and I want 4 keys from each day, 12 should work right? Nope, because the counts vary by day. I want to select the top 4 keys ...