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How do we collect data from a column of a table?

Hello and good time dear friends ...! Question again! When I am in challenge! I mean, I'm learning! I'm ashamed of this!
How do we collect data from a column of a table?
For example: column (name) --------- column (number)
Machine 1 -------------------- 25
Machine 2 ------------------- 40
Now: How do we add the number of machines together using the command: Math
Thanks