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Write a Procedure That Updates Stock After Order
Write a Procedure That Updates Stock After Order
Products Table:
Query Explanation:
-
Products table holds product details and stock.
-
Procedure checks if sufficient stock is available.
-
If yes → subtracts the ordered quantity.
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If not → prints an error.
-
Example shows usage and final result.
SQL Query:
-- Step 1: Create the Products table to store product stock info
CREATE TABLE Products (
ProductID INT PRIMARY KEY,
ProductName VARCHAR(100),
Stock INT
);
GO
-- Step 2: Insert some sample product data
INSERT INTO Products (ProductID, ProductName, Stock)
VALUES
(101, 'Laptop', 50),
(102, 'Mouse', 150),
(103, 'Keyboard', 100);
GO
-- Step 3: Create the procedure to update stock after an order is placed
CREATE PROCEDURE dbo.UpdateStockAfterOrder
@ProductID INT,
@OrderedQty INT
AS
BEGIN
-- Check if the product exists and enough stock is available
IF EXISTS (
SELECT 1 FROM Products
WHERE ProductID = @ProductID AND Stock >= @OrderedQty
)
BEGIN
-- Update the stock: subtract the ordered quantity
UPDATE Products
SET Stock = Stock - @OrderedQty
WHERE ProductID = @ProductID;
PRINT 'Stock updated successfully.';
END
ELSE
BEGIN
-- Handle the case when stock is not sufficient
PRINT 'Not enough stock available for this product.';
END
END;
GO
-- Step 4: Execute the procedure to update stock
EXEC dbo.UpdateStockAfterOrder @ProductID = 101, @OrderedQty = 5;
-- Step 5: Check the updated stock
SELECT * FROM Products;
Output:
