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                            [TOC]

## 域類型
域類型可以為我們聲明一個自定義各種要求的字段

## 示例
創建了整形必須大于0的約束,并且字段的底層還是 int 類型,可以通過`(mytable.id - 1)::posint`進行轉換
```
CREATE DOMAIN posint AS integer CHECK (VALUE > 0);
CREATE TABLE mytable (id posint);
INSERT INTO mytable VALUES(1);   -- works
INSERT INTO mytable VALUES(-1);  -- fails
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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