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by Eric Lippert via Fabulous Adventures In Coding on 8/31/2009 4:30:00 PM
The keyword "into" in a query comprehension means two different things, depending on whether it follows a join or select/group. If it follows a join, it turns a join into a group join. If it follows a select or group then it introduces a query continuation. These two features are quite different, but easily confused.
First, the group join. Suppose you've got a key -- a customer id number -- that is used as the primary key of a collection of customers, and as a foreign key of a collection of cre
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