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                            ## 一、mysql索引
### like走不走索引？
左匹配，右模糊，走索引。

## 二、新人筆試篇
### 2-1 關聯查詢SQL考查：
寫SQL如何判斷網約車？

```
-- 給網約車車輛打標記
SELECT * from tc_taxi p1,edw_global_vehicle p2
where p1.no = p2.plate_number
and p2.business_scope_code = 10000;
```

寫一個update語句，更新`tc_taxi`的`type`字段。
```SQL
UPDATE tc_taxi p1,edw_global_vehicle p2 set p1.type = '網約車'  
where p1.no = p2.plate_number
and p2.business_scope_code = 10000;
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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