[MySQL]獲取當月每一天

常用使用場景: 統計某個月(某個時間區間)內每一天的數據量 

   
   
  
  
          
 
           
 
            
 
             
 
            
 
            
 
             
 
              select 
              date_add( 
              curdate(), 
              interval( 
              cast(help_topic_id 
              as signed 
              integer) - 
              1) 
              day) 
              day 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              from mysql.help_topic 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              where help_topic_id < 
              day( 
              last_day( 
              curdate())) 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              order 
              by help_topic_id 
             
 
            
 
          
  
  
 
 
         

 

延伸用法: 獲取一段時間內的每分鍾

   
   
  
  
          
 
           
 
            
 
             
 
            
 
            
 
             
 
              set @stime = 
              str_to_date( 
              '2018-11-07 08:00', 
              '%Y-%m-%d %H:%i'); 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              set @etime = 
              str_to_date( 
              '2018-11-07 08:10', 
              '%Y-%m-%d %H:%i'); 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              select 
              date_add(@stime, 
              interval ( 
              cast(help_topic_id 
              as signed 
              integer) - 
              0) 
              minute) 
              minute 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              from mysql.help_topic 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              where help_topic_id <= 
              timestampdiff( 
              minute, @stime, @etime) 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              order 
              by help_topic_id 
             
 
            
 
          
  
  
 
 
         

 

順便貼一下oracle的寫法

   
   
  
  
          
 
           
 
            
 
             
 
            
 
            
 
             
 
              select trunc( 
              sysdate, 
              'MM') + 
              rownum - 
              1 
              day 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              from dual 
             
 
            
 
           
 
            
 
             
 
            
 
            
 
             
 
              connect 
              by 
              rownum <= to_number(to_char( 
              last_day( 
              sysdate), 
              'dd')) 
             
 
            
 
          
  
  
 
 
         

原文地址：https://blog.csdn.net/reeye_/article/details/83655477