I did quite a bit of SQL in my last job, and I can't think of a single case where I wish I had a pipeline operator. If I wanted to do something similar to the example on your homepage the simplest way is just to use subqueries.

Here's a rewrite of your query in T-SQL...

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SELECT EMP.Country, EMP.LastName, EMP.FirstName, OD.OrderID, ORD.ShippedDate, OD.SaleAmount

FROM (SELECT TOP 10 T1.OrderID, T1.ORDSUM FROM (SELECT OrderID, SUM(UnitPrice * Quantity * (1 - Discount)) AS SaleAmount FROM "Order Details" GROUP BY OrderID) AS T1 ORDER BY T1.ORDSUM DESC) AS OD

LEFT JOIN Orders AS ORD ON OD.OrderID = ORD.OrderID

LEFT JOIN Employees AS EMP ON ORD.EmployeeID = EMP.EmployeeID

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That's fairly concise, and was quick to bash out. I'd wager it could be made even smaller if I used LINQ instead of SQL. Perhaps your method has some advantages in other types of query? How do you see it?