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Ctrl + Space bar for entire column selection whereas
Shift + Space bar for entire row selection
To select columns: Ctrl + Space
To select Rows:Shift + Space
You could also use the following:
Ctrl + Shift then arrow keys depending on the direction of the data you intend to highlight.
Using this, you can reduce selection to the data you really intend to use and avoid highlighting the whole column or row.
Give it a try. :)