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                            # GROUP BY

在`mssql`中，`SELECT`中要么只能取`GROUP BY`中的字段， 或者使用聚合函數（sum/max/min...），否則會報錯；

<br />
使用及其不方便，但是我們其實也可以遵守它的規則并且選取出其他字段的。

<br />

## 解決辦法

> 使用`max/min`聚合函數來獲取其他字段，反正也是一個組合；沒有確切要獲取誰

<br />

**一個簡單示例**
```sql
SELECT 
    userid,
    max(name),
    max(gender)
    ...
FROM
    test
GROUP BY userid
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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