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                            ## 表子查詢
#### 概念
1. 表子查詢：子查詢返回的結果是多行多列，表子查詢與行子查詢非常相似，只是行子查詢需要產生行元素，而表子查詢沒有.
2. 行子查詢是用于where條件判斷：where子查詢.
3. 表子查詢是用于from數據源：from子查詢.

#### 語法:
~~~
Select 字段表 from (表子查詢) as 別名 [where] [group by] [having] [order by] [limit];
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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