我具有以下情况,并希望基于“排列ID”,“登录日期”来设置指标。如果用户登录网站在“日历年”中有多个时间,则最近的记录需要设置Y,否则“ N”。我还需要设置指标,例如“下两个”行(也就是行。)(表示在2017年12月13日最近访问的去年的1121221需要设置为“ Y”,如果用户在下一个紧接的1/12/2018访问,则为“ Y”)
答案 0 :(得分:0)
这是一种选择。它是做什么的?
TEST
CTE是一些示例行。请注意ARRANGE_ID = 999
,其日期为2017年和2019年(这意味着没有连续的年份,因此2019年的日期应为指标“ N”。但是,您没有说,如果存在2019年还有另一个日期;他们两个都将获得“ N”,还是最大登录日期仍将获得“ Y”?INTER
CTE使用MAX
分析函数查找年份的最大登录日期,并使用LAG
分析函数返回前一个登录日期(以便我检查是否那几年是连续的还是不连续的CASE
查找某些行是否满足使指标等于'Y'的条件您在这里:
SQL> with test (arrange_id, login_date) as
2 (select 234, date '2017-02-18' from dual union all
3 select 234, date '2017-04-13' from dual union all
4 select 234, date '2017-11-14' from dual union all
5 select 234, date '2018-01-14' from dual union all
6 select 234, date '2018-09-11' from dual union all
7 select 234, date '2019-04-02' from dual union all
8 select 234, date '2019-05-18' from dual union all
9 select 112, date '2017-02-23' from dual union all
10 select 112, date '2017-12-13' from dual union all
11 select 112, date '2018-01-12' from dual union all
12 select 999, date '2017-01-01' from dual union all
13 select 999, date '2017-05-25' from dual union all
14 select 999, date '2019-01-01' from dual
15 ),
16 inter as
17 (select arrange_id,
18 login_date,
19 max(login_date) over
20 (partition by arrange_id, extract (year from login_date)) maxdate,
21 lag(login_date) over (partition by arrange_id order by login_date) prev_date
22 from test
23 )
24 select arrange_id,
25 login_date,
26 case when login_date = maxdate and
27 extract(year from login_date) - extract(year from prev_date) <= 1 then 'Y'
28 else 'N'
29 end indicator
30 from inter
31 order by arrange_id, login_date;
ARRANGE_ID LOGIN_DATE I
---------- ---------- -
112 02/23/2017 N
112 12/13/2017 Y -- Y because it is MAX in 2017
112 01/12/2018 Y -- Y because it is MAX in 2018 and 2018 follows 2017
234 02/18/2017 N
234 04/13/2017 N
234 11/14/2017 Y -- Y because it is MAX in 2017
234 01/14/2018 N
234 09/11/2018 Y -- Y because it is MAX in 2018 and 2018 follows 2017
234 04/02/2019 N
234 05/18/2019 Y -- Y because it is MAX in 2019 and 2019 follows 2018
999 01/01/2017 N
999 05/25/2017 Y -- Y because it is MAX in 2017
999 01/01/2019 N -- N because it is MAX in 2019, but 2019 doesn't follow 2017
13 rows selected.
SQL>