Get max date an min date of a CSV

So as the title says, I need to get de maximun and minimun date on a CSV file. How do I get to do this?

The server side won’t let me do a “query” for a imported CSV file

My idea is also related to the extra table as in the import question. In a temporary table, you can sort by date column, and then take data from the first and last record from that column. This will be the maximum and minimum dates.

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