Question

我有一个名为ItemTransaction的表，列itemId, Qty, BatchNo列。我想选择所有具有qty >=0和<= 100以及itemid和batchno唯一的项目。

现在的问题是，可以在具有不同batchno的不同qty中重复单个项目。

select 
    ItemID, Quantity, BatchNo 
from  
    ItemTransaction 
where 
    Quantity >= 0 and Quantity <= 100 
group by 
    ItemID, Quantity, BatchNo

当我运行上述查询时，它会给出重复值。不知道如何从上述条件中获取不同的值。

示例数据

|ItemID | Quantity | BatchNo |
+----------------------------+
|1095   | 3        |   1     |
|1095   | 0        |   1     |
|1098   | 10       |   2     |
|1099   | 0        |   3     |
|1099   | 20       |   3     |
|1099   | 80       |   3     |

预期产出：

|ItemID | Quantity | BatchNo |
+----------------------------+
|1095   | 3        |   1     |
|1098   | 10       |   2     |
|1099   | 80       |   3     |

此处数量可以是批次中较大或批次较小的任何数量。

Answer 1

试试这个。

SELECT ItemID,
       Max(Quantity)Quantity,
       BatchNo
FROM   ItemTransaction 
WHERE  Quantity >= 0
       AND Quantity <= 100
GROUP  BY ItemID,
          BatchNo

Answer 2

添加Distinct关键字

select Distinct ItemID, Quantity, BatchNo 
from ItemTransaction 
where Quantity >= 0 and Quantity <= 100 
group by ItemID,Quantity,BatchNo

Answer 3

在分组后添加having子句并且distinct也是正确的

 select ItemID,Quantity,BatchNo from ItemTransaction 
 where Quantity >= 0 and Quantity <= 100 
 group by ItemID,Quantity,BatchNo
 having count(ItemID)=1 ;

当我发布上述答案时，您的问题尚未完成;截至目前它具有预期的输出，因此下面的查询将给出正确的答案。

  select ItemID,Quantity,BatchNo from Itm 
  where Quantity >= 0 and Quantity <= 100 and 
  (ItemID,Quantity) in 
  (select ItemID,max(Quantity) from itm group by ItemID) ;

SELECT语句避免在SQL Server中的多个列中重复

3 个答案: