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Editorial Team
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Asked: 2026-05-26T04:31:42+00:00

I have a table called ProductClassification with two columns ‘ProductID, ClassificationID’ ProductID, ClassificationID 10408,

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I have a table called ProductClassification with two columns ‘ProductID, ClassificationID’

ProductID, ClassificationID
10408, 1749
10408, 1750

A ProductID could have multiple ClassificationID. How would I extract a single product if I query multiple different ClassificationID.

for example: the below doesn’t work

SELECT Product.ID, Product.Name FROM
Product, ProductClassification WHERE
ProductClassification.ClassificationID = '1750' AND
ProductClassification.ClassificationID = '1749'
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1 Answer

  1. Editorial Team
    • The WHERE clause is checked on a record by record basis.
    • In a single record, the ClassificationID can’t be 1750 AND 1749.
    • Changing this to 1750 OR 1749 allows eahc indivudal record to filter through.
    • Then you need to check that for any One Product.ID both records came through. 

    SELECT
  Product.ID,
  Product.Name
FROM
  Product
INNER JOIN
  ProductClassification 
    ON Product.ID = ProductClassification.ProductID
WHERE
  ProductClassification.ClassificationID = '1750' OR
  ProductClassification.ClassificationID = '1749'
GROUP BY
  Product.ID,
  Product.Name
HAVING
  COUNT(DISTINCT ProductClassification.ClassificationID) = 2
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