Memory requirements for query

Hello,
is there some way that i could find out how much memory query will demand to be succesfuly executed ?
Maybe to see how much each object referenced in the FROM part of the clause is big ?
requirements

ok , thank you.
By big i ment would it help for this memory calculation if we use sum(bytes) from _segments for all the objects referenced in that query.

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Perhaps blocking?
Take a look at Adam's great stored procedure to see who is running on the server
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License:
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Memory requirements for query

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