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                            有時候，我們可能需要對一個字段進行一個SQL函數計算，然后再讓這個結果跟某一個值進行比較，當然這些函數可能在不同的數據庫中是不同的，比如 SqlServer與Oracle在很多字段處理函數上都不同，下面以SqlServer 求取某個字段的小時數是否大于15點：

![](https://box.kancloud.cn/742bbe2a36a19c4cd7dd706d00467b92_697x130.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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