Oracle date function for the previous month

Question

I have the query below where the date is hard-coded. My objective is to remove the harcoded date; the query should pull the data for the previous month when it runs.

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Answer 1

It is working with me in Oracle sql developer

    SELECT add_months(trunc(sysdate,'mm'), -1),
           last_day(add_months(trunc(sysdate,'mm'), -1)) 
    FROM dual