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                            [TOC]
### mysql 5.7 外鍵約束
主表：部門表
![](https://box.kancloud.cn/55a1f02d2163a4f070a2828ef4f63757_188x95.png)
從表：員工表
![](https://box.kancloud.cn/b2a3ebab671c74cbc74c192129e04095_271x99.png)
添加外鍵：從表 dep_id 關聯 主表 id
>[danger] CASCADE 
> 級聯更新 主表數據更新從表會更新外鍵
 級聯刪除 主表數據刪除，從表會一起刪除
![](https://box.kancloud.cn/128320f96927e7b19dc35e6611cde70b_771x90.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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