sql：mysql：函数：TIMESTAMPDIFF函数实现TimeStamp字段相减，求得时间差

 函数内指定是minute，则最终结果value值的单位是分钟，如果函数内指定为hours，则最终结果value值单位为小时。

   
   
  
  
 
   
 
    
 
     
 
    
 
    
 
     

       //UPLOAD_TIME 减去 CREATE_DTTM 求得时间差，以分钟数计时 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      select 
      avg( 
      TIMESTAMPDIFF( 
      MINUTE,CREATE_DTTM,UPLOAD_TIME)) 
      value, 
      LEFT(CREATE_DTTM, 
      10) 
      time 
      from 表名 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      WHERE 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       CREATE_DTTM >= 
      '2018-01-21' 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      AND CREATE_DTTM <= 
      DATE_ADD( 
      '2019-02-19', 
      INTERVAL 
      1 
      DAY) 
      and UPLOAD_TIME 
      is 
      not 
      null 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      group 
      by 
      LEFT(CREATE_DTTM, 
      10) 
     
 
    
 
  
  
  
 
 

参考：https://blog.csdn.net/yiifaa/article/details/78611079

https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_microsecond

 

   
   
  
  
 
   
 
    
 
     
 
    
 
    
 
     

       mysql> 
      SELECT TIMESTAMPDIFF(MONTH,'2003-02-01','2003-05-01'); 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       -> 
      3 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       mysql> 
      SELECT TIMESTAMPDIFF(YEAR,'2002-05-01','2001-01-01'); 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       -> - 
      1 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       mysql> 
      SELECT TIMESTAMPDIFF(MINUTE,'2003-02-01','2003-05-01 12:05:55'); 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       -> 
      128885 
     
 
    
 
  
  
  
 
 

原文地址：https://blog.csdn.net/weixin_38750084/article/details/88118039