How to Find Duplicate Values in SQL

How to Find Duplicate Records in SQL

We want to find entries where the OrderID and ProductID columns are identical. This type of duplicate likely means there is a bug in the ordering system, since each order will process each product in that order only once in the cart. If multiple quantities of that product are ordered, the Quantity value would simply be increased; separate (duplicate) rows should not be created. A glitch of this type may impact business operations negatively if the orders are being fulfilled, packaged, and shipped automatically.

To find duplicates in multiple column values, we can use the following query. It’s very similar to the one for a single column:

SELECT OrderID, ProductID, COUNT(*)
FROM OrderDetails
GROUP BY OrderID, ProductID
HAVING COUNT(*) > 1

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