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I've tried multiple methods of adding and removing columns to a dataset, but it seems no matter which way I choose I can't get the data to typeset as a table.

Here's my initial dataset:

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1) Construct an association using <|#, ... |> syntax (with the Normal form to show that it yields a list of associations):

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2) Using Append[]:

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3) Using JoinAcross[]:

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In each case, the dataset returns is typeset as a single row. Can anyone shed some light on as to why? I have a hunch that I'm fighting some kind of internal type system. What's strange is given much simpler datasets, each one of these methods works fine.

Zack Angelo
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    The impact of type inference upon typesetting is discussed in detail here. There might be enough information there for the present question to be considered a duplicate. – WReach Sep 26 '14 at 03:50

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