AdventureWorks Database: Return the name of the product that is the least expensive for value of ProductSubcategoryID is 37

SQL Query - AdventureWorks: Exercise-102 with Solution

102. From the following table write a query in SQL to return the name, list price, and the alias "LeastExpensive" for the product(s) that have the lowest list price within a given product subcategory (ProductSubcategoryID = 37). Ensure the query filters the results to this specific subcategory and correctly identifies the least expensive product(s).

productid|name                            |productnumber|makeflag|finishedgoodsflag|color       |safetystocklevel|reorderpoint|standardcost|listprice|size|sizeunitmeasurecode|weightunitmeasurecode|weight |daystomanufacture|productline|class|style|productsubcategoryid|productmodelid|sellstartdate          |sellenddate            |discontinueddate|rowguid                             |modifieddate           |
---------+--------------------------------+-------------+--------+-----------------+------------+----------------+------------+------------+---------+----+-------------------+---------------------+-------+-----------------+-----------+-----+-----+--------------------+--------------+-----------------------+-----------------------+----------------+------------------------------------+-----------------------+
        1|Adjustable Race                 |AR-5381      |false   |false            |            |            1000|         750|           0|        0|    |                   |                     |       |                0|           |     |     |                    |              |2008-04-30 00:00:00.000|                       |                |694215b7-08f7-4c0d-acb1-d734ba44c0c8|2014-02-08 10:01:36.827|
        2|Bearing Ball                    |BA-8327      |false   |false            |            |            1000|         750|           0|        0|    |                   |                     |       |                0|           |     |     |                    |              |2008-04-30 00:00:00.000|                       |                |58ae3c20-4f3a-4749-a7d4-d568806cc537|2014-02-08 10:01:36.827|
        3|BB Ball Bearing                 |BE-2349      |true    |false            |            |             800|         600|           0|        0|    |                   |                     |       |                1|           |     |     |                    |              |2008-04-30 00:00:00.000|                       |                |9c21aed2-5bfa-4f18-bcb8-f11638dc2e4e|2014-02-08 10:01:36.827|
        4|Headset Ball Bearings           |BE-2908      |false   |false            |            |             800|         600|           0|        0|    |                   |                     |       |                0|           |     |     |                    |              |2008-04-30 00:00:00.000|                       |                |ecfed6cb-51ff-49b5-b06c-7d8ac834db8b|2014-02-08 10:01:36.827|
      316|Blade                           |BL-2036      |true    |false            |            |             800|         600|           0|        0|    |                   |                     |       |                1|           |     |     |                    |              |2008-04-30 00:00:00.000|                       |                |e73e9750-603b-4131-89f5-3dd15ed5ff80|2014-02-08 10:01:36.827|
      317|LL Crankarm                     |CA-5965      |false   |false            |Black       |             500|         375|           0|        0|    |                   |                     |       |                0|           |L    |     |                    |              |2008-04-30 00:00:00.000|                       |                |3c9d10b7-a6b2-4774-9963-c19dcee72fea|2014-02-08 10:01:36.827|
      318|ML Crankarm                     |CA-6738      |false   |false            |Black       |             500|         375|           0|        0|    |                   |                     |       |                0|           |M    |     |                    |              |2008-04-30 00:00:00.000|                       |                |eabb9a92-fa07-4eab-8955-f0517b4a4ca7|2014-02-08 10:01:36.827|
	  -- more --

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Sample Solution:

-- Select the product name, list price, and name of the least expensive product from the Production.Product table
SELECT
    p.name,                       -- Selects the product name
    p.listprice,                  -- Selects the product list price
    p.name AS LeastExpensive      -- Aliases the product name as LeastExpensive for the output
FROM
    Production.Product p          -- From the Production.Product table, aliased as p
JOIN
    (SELECT
        MIN(listprice) AS MinPrice   -- Selects the minimum list price from the Production.Product table
     FROM
        Production.Product
     WHERE
        ProductSubcategoryID = 37) AS sub   -- Filters for products with ProductSubcategoryID of 37 and aliases the subquery as sub
ON
    p.listprice = sub.MinPrice     -- Joins the main query with the subquery on the list price being equal to the minimum list price
WHERE
    p.ProductSubcategoryID = 37;   -- Filters for products with ProductSubcategoryID of 37

Explanation:

This SQL query is designed to find the least expensive product within a specific subcategory (with ProductSubcategoryID = 37) in the Production.Product table.

• Inner Subquery:
• The subquery selects the minimum list price (MIN(listprice)) from the Production.Product table where the ProductSubcategoryID is 37. This subquery is aliased as sub.
• The result of this subquery will be a single value: the minimum list price of products in the specified subcategory.
• Main Query:
• The main query selects the product name (p.name), list price (p.listprice), and aliases the product name as LeastExpensive from the Production.Product table, which is aliased as p.
• It performs a join with the result of the subquery (sub) on the condition that the product's list price (p.listprice) matches the minimum list price (sub.MinPrice) found in the subquery.
• The WHERE clause filters the products to only those with a ProductSubcategoryID of 37.
• Result:
• The query returns the name, list price, and name (as LeastExpensive) of the least expensive product(s) within the specified subcategory (with ProductSubcategoryID = 37).
• If there are multiple products with the same minimum list price, all such products will be included in the result set.

Sample Output:

name               |listprice|leastexpensive     |
-------------------+---------+-------------------+
Patch Kit/8 Patches|     2.29|Patch Kit/8 Patches|

SQL AdventureWorks Editor:

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