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I am bored of writing IF statement to replace data with dummy data, please suggest me the quickest way, following is example of what I wanna achieve.
Create a mapping table (load from inline or from Excel) and use ApplyMap to replace the current field with the result.
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Applymap is the better option.
See this post for more details Don't join - use Applymap instead
You can also make use of a Lookup() function.