日期之间的情况

Question

我正在尝试标记所选滚动日期和之前4个月标准的数据。 如果说

，我该如何写一个案例

Case when X=1 and Y=2 And between Date- 4months Then '1' 
  When X =2 and Date(Year/month)- 4monthsDate Then '2' 
END ) AS Flag 

GROUP BY MONTHOFDATE

Answer 1

最好使用ADD_MONTHS函数：

CASE
  WHEN X = 1 AND
       Y = 2 AND
       SOME_DATE BETWEEN ADD_MONTHS(SYSDATE, -4) AND SYSDATE
    THEN '1' 
  WHEN X = 2 AND
       SOME_DATE BETWEEN ADD_MONTHS(SYSDATE, -4) AND SYSDATE
    THEN '2' 
END AS FLAG

祝你好运。