Power Queyr Table Columns of Type

Hi,

Can someien explian or pointo to information, other than Ms docs, Pq how, I've looked at those , this is the problem,

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then

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But if I have in imported table

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and then

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i get an empty list , this goes for all other data types, I have read through and am either missing or not understanding something, docs pq say it distinguishes between nullable and non nullable but I don't think that is the problem, and ideas as to what I'm doing wrong?

Richard.

Table.TransformColumnTypes assignes nullable types so that Type.Is(type nullable Int64.Type, Int64.Type) is false.

Thank you both, I had a horrible feeling this was going to be more complicated than I wanted,

RD