如果我必须每个月运行 sql 脚本，我如何才能在 ORACLE 中获取上个月的数据？

Question

Here is my version of SQL code:

select HISTORY_ID,START_DTM FROM LEM.LEM_ALERT_HISTORY 
where MONTH from START_DTM = add_months (sysdate, -1) ;

Also, what if the current month is Jan, how can I get the data from last year's Dec?

Thanks a lot

Answer 1

You can try this one:

select HISTORY_ID
     , START_DTM
  from LEM.LEM_ALERT_HISTORY
 where START_DTM between TRUNC(ADD_MONTHS(SYSDATE, -1),'MM') AND  LAST_DAY(ADD_MONTHS(TRUNC(SYSDATE,'mm'),-1))

If the current month is January it will return the data from December last year