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                            #### mysql 同表兩列值互換
//  假設表 table_test 字段有  id、start_at 、end_at，其中start_at ，跟 end_at的值搞返了，需要執行遷移修復
```
update
   table_test as a,
   table_test as b
set
   a.start_at = b.end_at,
   a.end_at = b.start_at
where a.id = b.id  AND a.start_at > a.end_at;
```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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