SQL oracle：如何获取今天和去年之间的日期

Question

I would like to know how to get the date column that's between today and today(lastyear) Please help mee...

SELECT *
FROM TABLE_X
WHERE X_DATE BETWEEN (SYSDATE) AND (SYSDATE-365);

Answer 1

Unfortunately, both sysdate and current_date in Oracle have time components. If you want the time component, then fine. In general, though, you probably want:

where x_date >= add_months(trunc(sysdate), -12) and
      x_date < trunc(sysdate)

Note: It is unclear whether you want to include the current date or not, so you might want:

where x_date >= add_months(trunc(sysdate), -12) + interval '1' day and
      x_date < trunc(sysdate) + interval '1' day

Answer 2

As a starter, you have the range bounds the wrong way around (the lower bound is greater than the upper bound), so your query cannot return any row.

Then: not all years have 365 days - use add_months() instead:

where x_date between add_months(trunc(current_date), -12) and current_date 

I am unsure whether you want to take the time component into account or not. Assuming that you want the records until today included, you would use:

where x_date >= add_months(trunc(current_date), -12) 
  and x_date <  trunc(current_date) + 1

If you don't want today, then use trunc(current_date) instead of trunc(current_date) + 1 .