For those new to data analysis, I have compiled a list of free sites where you can practice SQL, methods for setting up your own practice environment, and 10 practice problems to review the content of ...

Introduction"Could you take a look at this SQL?""Could you please review this table design?"Do you find yourself flooded with ...

提示 ： HotelDB.bak 是核心资产，它比 CreateTable.sql 更可靠——因为备份里包含已建好的索引、视图、存储过程（如 sp_GetTodayCheckInCount ），而 SQL 脚本可能漏掉某些约束。不要试图手动建库再导入 SQL，直接还原 .bak 是最快最稳路径。