Yeah, I have noticed the struggle in the past few days. A co-worker from another departement and with access to the database I should analyze, creates these Excel sheets without giving me any additional information. Without any access to said database, I have very little but the data to go on. If I base my analysis on an Excel sheet filled with faulty data, my report will also be faulty. I have learned that the hard way. Anyway, thanks for sharing your ideas. I will write an e-mail to my sheet provider and ask him provide the query/the parameters.
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