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          廣告
        
                        
                
  

                

                
    
                
        
                
                            ```
select
  device_id,
  gender,
  case
    when age >= 25 then '25歲及以上'
    when age >= 20 then '20-24歲'
    when age < 20 then '20歲以下'
    else '其他'
  end as age_cut
from
  user_profile
```
![](https://img.kancloud.cn/09/2d/092d8274171df31bf407684ffd129c17_323x313.png)

```
select
  DATE_FORMAT(date, '%d') as day,
  count(question_id) as question_cut
from
  question_practice_detail
where
  DATE_FORMAT(date, '%Y-%m') = '2021-08'
group by
  date
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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