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                            ## 1.基本概念

## 2.查詢數據
### 2.1.查詢單列數據
```
select 列名 from 表名;
```
### 2.2.查詢多列數據
```
select 列名1, 列名2, 列名3, ... from 表名;
```
### 2.3.查詢所有列的數據
```
select  * from 表名;
```

查詢前幾行數據
```
select 列名 from 表名 limit 5;
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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