[sql] SQL Server Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >=

Either your data is bad, or it's not structured the way you think it is. Possibly both.

To prove/disprove this hypothesis, run this query:

SELECT * from
(
    SELECT count(*) as c, Supplier_Item.SKU
    FROM Supplier_Item
    INNER JOIN orderdetails
        ON Supplier_Item.sku = orderdetails.sku
    INNER JOIN Supplier
        ON Supplier_item.supplierID = Supplier.SupplierID
    GROUP BY Supplier_Item.SKU
) x
WHERE c > 1
ORDER BY c DESC

If this returns just a few rows, then your data is bad. If it returns lots of rows, then your data is not structured the way you think it is. (If it returns zero rows, I'm wrong.)

I'm guessing that you have orders containing the same SKU multiple times (two separate line items, both ordering the same SKU).

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