sql-仅显示最近四个月

Question

我的好参考是 How to filter my results so it shows the last four months of data - sql

到现在为止

SELECT ItemCode, SUM(QuantityOrdered) AS Total_Quantity
FROM OrderDetail 
GROUP BY ItemCode
ORDER BY SUM(QuantityOrdered) DESC;

显示

ItemCode  Total_Quantity 
PL         1200    
MA          975        
153         200

虽然 PL 的订单是 2011 年 9 月 23 日的 200 份 2014 年 2 月 3 日的 200 份 2016 年 12 月 6 日的 200 份 2017 年 1 月 21 日 200 份

我怎样才能过滤掉它以仅显示今天月份的最近四个月的结果？

我可以在查询设计或 SQL 代码上做点什么吗？

关于WHERE dbo_SO_SalesOrderHeader.OrderDate >= dateadd(month, -4, cast(getdate() AS DATE)) 行语法错误的任何想法。非常感谢！

SELECT dbo_SO_SalesOrderDetail.ItemCode, SUM(dbo_SO_SalesOrderDetail.QuantityOrdered) AS Total_Quantity, dbo_SO_SalesOrderHeader.OrderDate
FROM dbo_SO_SalesOrderDetail INNER 
JOIN dbo_SO_SalesOrderHeader ON dbo_SO_SalesOrderDetail.SalesOrderNo = dbo_SO_SalesOrderHeader.SalesOrderNo
WHERE dbo_SO_SalesOrderHeader.OrderDate >= dateadd(month, -4, cast(getdate() AS DATE))
GROUP BY dbo_SO_SalesOrderDetail.ItemCode
ORDER BY SUM(dbo_SO_SalesOrderDetail.QuantityOrdered) DESC;

Answer 1

添加 where 子句并将“DateField”与当前日期进行比较。因此，如果您的 DateField 名为 OrderDate，请将“DateField”替换为“OrderDate”

SELECT ItemCode, SUM(QuantityOrdered) AS Total_Quantity
FROM OrderDetail 
where DateField >= dateadd(month, -4, cast(getdate() as DATE)) 
GROUP BY ItemCode
ORDER BY SUM(QuantityOrdered) DESC;

我猜测您的日期字段实际上在 OrderHeader 表中，如果是这样，您将需要加入 OrderHeader 表。下面是一个例子

SELECT ItemCode, SUM(QuantityOrdered) AS Total_Quantity
    FROM OrderDetail 
    JOIN OrderHeader on OrderHeader.Orderid=OrderDetail.OrderID
    WHERE OrderHeader.OrderDate >= dateadd(month, -4, cast(getdate() as DATE)) 
    GROUP BY ItemCode
    ORDER BY SUM(QuantityOrdered) DESC;