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                            [TOC]
> [可用外部數據庫列表](https://wiki.postgresql.org/index.php?title=Foreign_data_wrappers&nocache=1#LDAP_Wrappers)


## 概述
- 外部源可與內部源進行 join 操作,實現跨數據庫，甚至跨數據組件的JOIN


## 語法
創建服務
```
CREATE SERVER mongo_server
	FOREIGN DATA WRAPPER mongo_fdw
	OPTIONS (address '127.0.0.1', port '27017');
```

刪除服務
```
DROP SERVER my_gpsql_server [CASCADE];
```
- CASCADE 表示連服務依賴的表一塊刪除
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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