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#### 參考
```
SELECT t1.*
FROM your_table t1
INNER JOIN (
  SELECT id, MAX(timestamp) AS max_timestamp
  FROM your_table
  GROUP BY id
) t2 ON t1.id = t2.id AND t1.timestamp = t2.max_timestamp;

```

實現：
改前：
![](https://img.kancloud.cn/c1/eb/c1eb4baff0260f10fe8dc72bb4ec3389_1225x570.png)
優化后：
![](https://img.kancloud.cn/8b/54/8b5401254e5a3eb96021037052be7ead_1205x561.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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