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Oracle obtains the beginning and end of the month time, and obtains the beginning and end of the previous month time

2022-06-27 22:30:00 【Tiantian code Tiantian】

select trunc(sysdate, 'mm'),
       last_day(trunc(sysdate)),
       trunc(add_months(trunc(sysdate), -1), 'mm'),
       last_day(add_months(trunc(sysdate), -1)),
       trunc(add_months(trunc(sysdate), -2), 'mm'),
       last_day(add_months(trunc(sysdate), -2))
  from dual