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                            substring(參數1，參數2，參數3)，其中三個參數分別表示：參數1表示需要截取的字符串，**參數2**表示從字符串的那個位置開始截取（字符串下標從**1**開始），**參數3**表示要截取**多少位**，如果不寫，表示截取從參數2指定的位置開始**剩下**的全部字符。
```
SELECT
    CONCAT(
        'ALTER TABLE ',
        table_name,
        ' RENAME TO db_',
        substring(table_name, 4),
        ';'
    )
FROM
    information_schema. TABLES
WHERE
    table_name LIKE 'ct%';
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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