1. SQL语句在线练习 http://sample.jimstone/xsql/

  2. SQL语句测验 http://www.w3school/quiz/quiz.asp?quiz=sql

  3. sql语句练习50题(Mysql版)  https://blog.csdn/fashion2014/article/details/78826299/

  4. http://sqlfiddle/ 
    　　 

     

  5. http://zh.sqlzoo/wiki/SELECT_basics/zh

  6. https://sqlbolt/lesson/select_queries_introduction

  7. https://www.w3resource/sql-exercises/sql-retrieve-from-table.php

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