Lookup

Yesterday I had to merge data from two Excel sheets. I know Excel is not MS Access so maybe the lookup function is not a good idea, but since it’s there it helped a lot.

You need to have your data sorted though (or else use vlookup). That relates with database keys and how searching in sorted arrays (binary search) is much faster than searching in random data, but if someone does not know about that stuff it may not be obvious that data must be sorted.

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