Question

我正在尝试查询星期一订购的产品，而我对如何格式化或提取特定的星期几为orderDate值感到困惑...

这就是我所拥有的......（我对SQL很新，所以我可能会离开......）

SELECT Products.productName, OrderDetails.orderNumber, Orders.orderDate

FROM Orders, OrderDetails, Products

WHERE Orders.orderDate LIKE '%Monday%;

提前致谢！

Answer 1

SELECT  Products.productName , 
        OrderDetails.orderNumber , 
        DATENAME(dw,Orders.orderDate),  
        Orders.orderDate  
FROM Orders 
inner join OrderDetails  
   on OrderDetails.OrderID = Orders.ID 
inner join Products 
   on Products.ID = Orders.ProductID  
WHERE DATENAME(dw,Orders.orderDate) = 'Monday'

Answer 2

SELECT 
   Products.
   productName, 
   OrderDetails.orderNumber, 
   Orders.orderDate
FROM 
Orders 
JOIN OrderDetails ON Orders.OrdersID = OrderDetails.OrderID
JOIN Products ON OrderDetail.ProductID = Products.ProductID
WHERE 
DATENAME(DW,Orders.orderDate) = 'Monday'

Answer 3

使用Datepart功能，DATEPART（W，[DATE]）将返回工作日。（星期一为1）

SELECT Products.productName, OrderDetails.orderNumber, Orders.orderDate

FROM Orders, OrderDetails, Products

WHERE DATEPART(w,Convert(Date,Orders.orderDate))=1

注意：这将产生笛卡尔积的结果。请正确加入这些表格

Answer 4

您可以使用sql date函数：
Oracle: to_char(Orders.orderDate,'D')
MySql: DAYOFWEEK(Orders.orderDate)

SQL：列出星期一订购的产品

4 个答案: