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                            [TOC]

##  運算符

### 算術運算符


| 運算符 | 作用 |
| --- | --- |
| + | 加法 |
| \- | 減法 |
| \* | 乘法 |
| / 或 DIV | 除法 |
| % 或 MOD | 取余 |


### 比較運算符
| 符號 | 描述 | 備注 |
| --- | --- | --- |
| \= | 等于 |  |
| <>, != | 不等于 |  |
| \> | 大于 |  |
| < | 小于 |  |
| <= | 小于等于 |  |
| \>= | 大于等于 |  |
| BETWEEN | 在兩值之間 | \>=min&&<=max |
| NOT BETWEEN | 不在兩值之間 |  |
| IN | 在集合中 |  |
| NOT IN | 不在集合中 |  |
| <=> | 嚴格比較兩個NULL值是否相等 | 兩個操作碼均為NULL時，其所得值為1；而當一個操作碼為NULL時，其所得值為0 |
| LIKE | 模糊匹配 |  |
| REGEXP 或 RLIKE | 正則式匹配 |  |
| IS NULL | 為空 |  |
| IS NOT NULL | 不為空 |

實例:
1.rlike 正則表達式
```
 select user_login   from hs_user where user_login RLIKE "h$"
```
所有 h 結果的賬號
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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