User Defind Function| Microsoft SQL Server Online Training Session -3 | (Part-5)
CREATE FUNCTION TotalCalculate
(@UnitPrice decimal(10,2),@Quantity int)
RETURNS decimal(10,2)
AS
BEGIN
RETURN @UnitPrice * @Quantity
END
SELECT p.ProductName,o.UnitPrice, o.Quantity,
dbo.TotalCalculate(o.UnitPrice, o.Quantity) AS Total
FROM Product p, OrderItem o
where p.Id=o.ProductId
------2--
Alter FUNCTION applyDiscount(@product VARCHAR(55), @discount int)
RETURNS VARCHAR(255)
AS
BEGIN
DECLARE @result VARCHAR(255);
DECLARE @productID int;
SET @productID = (SELECT id
FROM product
WHERE productName =@product) ;
IF @productID IS NOT NULL
BEGIN
DECLARE @dicountPrice float=
(SELECT top 1 (o.UnitPrice* o.Quantity)- @discount
FROM Orderitem o, dbo.[Order] d, OrderItem t
WHERE o.ProductId=@productID
and d.Id=o.OrderId
and t.id =o.Id
and t.OrderId=o.OrderId and t.ProductId=o.ProductId );
SET @result = 'THE PRODUCT: ' +
cast (@productID as varchar (50)) +
' IS REDUCED TO: ' +
CAST (@dicountPrice AS VARCHAR(50))+ ' Dollars';
END
ELSE
SET @result = 'THE PRODUCT HAS NOT BEEN FOUND ';
RETURN @result
END
SELECT dbo.applyDiscount('Chang', 100)
-----SQL Server inline table-valued functions
alter FUNCTION GetCustomersWithOrdersDetails ()
RETURNS @CustomersWithOrders TABLE
(CustomerID int, ContactName nvarchar(50),
Orderid int,orderdate date,city varchar(50),TotalAmount decimal(12,2))
AS
BEGIN
INSERT INTO @CustomersWithOrders
SELECT c.id, c.FirstName+' '+c.LastName,
o.id ,o.OrderDate,city,TotalAmount
FROM Customer c
JOIN dbo.[Order] o ON c.id = o.customerid
RETURN
END
SELECT * FROM [dbo].[GetCustomersWithOrdersDetails] () order by customerid
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