Identify Products that Have Never Been Ordered Query Using MS SQL Server?

To identify products that have never been ordered in SQL Server, you need to determine which products in your product catalog do not appear in any order records. Here’s how you can achieve this:

Assuming you have the following tables:

• Products:
  • ProductID
  • ProductName
• OrderDetails:
  • OrderID
  • ProductID
  • Quantity

Here’s a SQL query to find products that have never been ordered:

SQL Query

SELECT

    p.ProductID,

    p.ProductName

FROM Products p

LEFT JOIN OrderDetails od

    ON p.ProductID = od.ProductID

WHERE od.ProductID IS NULL;

Explanation:

1. LEFT JOIN OrderDetails od ON p.ProductID = od.ProductID: Performs a left join between the Products table and the OrderDetails table based on the ProductID. This ensures that all products are included in the result set, even if there are no corresponding entries in the OrderDetails table.

2. WHERE od.ProductID IS NULL: Filters the results to include only those products where there is no corresponding entry in the OrderDetails table, meaning these products have never been ordered.

Example Data and Results

Assume you have the following data:

Products Table:

ProductID	ProductName
1	Widget A
2	Widget B
3	Widget C
4	Widget D

OrderDetails Table:

OrderID	ProductID	Quantity
1	1	10
2	2	5

In this case, ProductID 3 and 4 are not found in the OrderDetails table.

The result of the query would be:

ProductID	ProductName
3	Widget C
4	Widget D

This result shows the products that have never been ordered.

You can execute this query in SQL Server Management Studio or any SQL query tool connected to your SQL Server to identify products that have never been ordered.