SQL练习
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在线练习网站 
 参考:https://zhuanlan.zhihu.com/p/407421130
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常用函数 
 2.1 去重:distinctselect disctinct university from user;
 2.2 窗口函数:https://zhuanlan.zhihu.com/p/92654574
 2.3 COALESCE:https://blog.csdn.net/weixin_46160781/article/details/136349216
 2.4 lead:https://blog.csdn.net/weixin_46599926/article/details/128276307
 2.5 datediff: https://blog.csdn.net/mzl87/article/details/125531113
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练习50题 
 参考:https://blog.csdn.net/weixin_42073408/article/details/118385794
 
                     
                    
                 
                    
                 
                
            
         
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浙公网安备 33010602011771号