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                            ## length，repeat

### 說明
|   函數  |  說明   |
| --- | --- |
| length(str)  | 返回字符串str中的字符數  |
|  repeat(str,x) |  返回字符串str重復x次的結果  |

### 例子：預約編號為8位，不夠8位的前面填充0
```sql
SELECT
	id,
	reserve_no,
	concat_ws('',repeat(0, 8 - length(reserve_no)),reserve_no)
FROM
	reserve;
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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