Data engineers who read and review SQL every day, but still run into inherited production queries that are painful to reason about. You've got a 150-line query, an INSERT ... SELECT, a MERGE, or a ...

An interactive, browser-based SQL learning platform that teaches SQL from basics to advanced concepts. Built with SQLite (in-browser via sql.js) and optional PostgreSQL server support. sql/ ├── ...

设置SQL Server 2008定时任务，通过维护计划实现数据自动备份与旧备份文件的定期删除，统一调度管理，确保数据安全并节省存储空间。 1、 进入实例管理界面，选择维护计划，右键点击后启动维护计划向导，输入计划名称，确认无误后点击下一步继续操作。