SQL基本练习

SQL在线基本练习

https://www.liaoxuefeng.com/wiki/1177760294764384

SQL在线基本练习

https://www.nowcoder.com/ta/sql-quick-study

SQL在线进阶练习

https://www.nowcoder.com/ta/sql-advanced

SQL在线练习-大厂面试

https://www.nowcoder.com/ta/sql-factory-interview