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### 11.1、union可以合并集合（相加）
             

1、查詢job包含MANAGER和包含SALESMAN的員工
```
select * from emp where job in('MANAGER', 'SALESMAN');
```
![](https://img.kancloud.cn/67/63/6763997a672dc72af7c6d9f371f1ba9f_634x213.png)
             

2、采用union來合并
             

```
select * from emp where job='MANAGER'

union

select * from emp where job='SALESMAN'
```
![](https://img.kancloud.cn/a7/0c/a70c8c408bccd89fdc7d7c64a74402e2_642x264.png)
合并結果集的時候，需要查詢字段對應個數相同。*在**Oracle中更嚴格，不但要求個數相同，而且還要求類型對應相同*。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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