Relating unrelated rows

A recurring question in the newsgroups is: “How do I output unrelated rows side by side?”   I’ll use the AdventureWorks database as an example. Suppose that my manager wants a report listing, for each order, all products ordered and all reasons the customer has for ordering from AdventureWorks. Here’s a sample of how the report should look.   SalesOrderNumber ProductID Reason SO51318 858 Other SO31518 870 Price SO31518 872 NULL SO31518 997 NULL SO31519 870 On Promotion SO31519 999 Price   Getting a list of all products ordered for each order is a trivial affair:   SELECT      soh.SalesOrderNumber, sod.ProductID…
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