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                            子查詢最終結果是表，可能是多個列，單個列，單個值
**三種子查詢**:
1. 作為select的計算字段
2. 作為where語句的過濾條件
3. 作為from的數據來源表
![](https://img.kancloud.cn/3c/a6/3ca6a4667466cb158ab3da2773879e1a_1280x720.png)
![](https://img.kancloud.cn/1b/c2/1bc27fefacf359042550b2249d4d108e_1280x720.png)
![](https://img.kancloud.cn/f7/1c/f71c9068c9c2c4da1c90454398c7b4a9_587x177.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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