Question

我在oracle数据库中有一个表，其数据如下所示

G_DATE  P_KEY   P_STATUS    P_USER  P_CD
3/1/2019    1   old           a      bb
3/1/2019    2   old           b      ab
3/1/2019    3   new           c      cb
3/1/2019    4   med           c      cb
3/2/2019    1   old           a      bb
3/2/2019    2   old           b      ab
3/2/2019    3   new           c      cb
3/2/2019    4   med           c      cb
3/3/2019    1   old           a      bb
3/3/2019    2   new           d      ab
3/3/2019    3   med           d      cb
3/3/2019    4   new           c      cb
3/4/2019    1   med           d      bb
3/4/2019    2   old           d      xy
3/4/2019    3   med           d      cb
3/4/2019    5   new           c      cb
3/5/2019    1   old           a      bb
3/5/2019    2   new           d      ab
3/5/2019    3   med           d      cb
3/5/2019    5   new           c      xy

并且我正在尝试使用解析函数来提供代码以选择以下数据，但是我正在努力比较这些组合。

这就像我们正在构造一个尺寸变化缓慢的维度表一样，只要这3个属性中的任何一个发生变化，填充的有效日期和结束日期就会被填充。 p_STATUS，p_cD，P_UsER 自然键是g_date和p_key。如果您注意到我发布的输出，对于给定的p_key和g_date，我们必须跟踪属性的任何更改。

上表中的

主键是p_key和g_date，对于p_status，p_user和p_cd的每个更改，都需要选择一个新行，并为eff_dt和end_dt进行相应的更改，分别用于g_date和p_key的每个组合。能否请您提供一些有关如何实现低于输出的建议

P_KEY   P_STATUS    P_USER  P_CD    eff_dt      end_dt  latest_row_flag
1       old         a       bb      3/1/2019    3/3/2019    N
1       med         d       bb      3/4/2019    3/4/2019    N
1       old         a       bb      3/5/2019    12/31/4712  Y
2       old         b       ab      3/1/2019    3/2/2019    N
2       new         d       ab      3/3/2019    3/3/2019    N
2       old         d       xy      3/4/2019    3/5/2019    N
2       new         d       ab      3/5/2019    12/31/4712  Y
3       new         c       cb      3/1/2019    3/2/2019    N
3       med         d       cb      3/3/2019    12/31/4712  Y
4       med         c       cb      3/1/2019    3/2/2019    N
4       new         c       cb      3/3/2019    12/31/4712  Y
5       new         c       cb      3/4/2019    3/4/2019    N
5       new         c       xy      3/5/2019    12/31/4712  Y

----用于创建表并将行插入表的脚本

create table work_audit
( g_date date, 
  P_key  number, 
  P_status varchar2(10),
  p_user  varchar2(10),
  p_cd varchar2(10) 
);

SET DEFINE OFF;
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/1/2019', 'MM/DD/YYYY'), 1, 'old', 'a', 'bb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/1/2019', 'MM/DD/YYYY'), 3, 'new', 'c', 'cb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/1/2019', 'MM/DD/YYYY'), 4, 'med', 'c', 'cb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/1/2019', 'MM/DD/YYYY'), 2, 'old', 'b', 'ab');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/2/2019', 'MM/DD/YYYY'), 3, 'new', 'c', 'cb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/2/2019', 'MM/DD/YYYY'), 1, 'old', 'a', 'bb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/2/2019', 'MM/DD/YYYY'), 2, 'old', 'b', 'ab');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/2/2019', 'MM/DD/YYYY'), 4, 'med', 'c', 'cb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/3/2019', 'MM/DD/YYYY'), 1, 'old', 'a', 'bb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/3/2019', 'MM/DD/YYYY'), 2, 'new', 'd', 'ab');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/3/2019', 'MM/DD/YYYY'), 3, 'med', 'd', 'cb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/3/2019', 'MM/DD/YYYY'), 4, 'new', 'c', 'cb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/4/2019', 'MM/DD/YYYY'), 1, 'med', 'd', 'bb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/4/2019', 'MM/DD/YYYY'), 2, 'old', 'd', 'xy');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/4/2019', 'MM/DD/YYYY'), 3, 'med', 'd', 'cb');
Insert into WORK_AUDIT
   (G_DATE, P_KEY, P_STATUS, P_USER, P_CD)
 Values
   (TO_DATE('3/4/2019', 'MM/DD/YYYY'), 5, 'new', 'c', 'cb');

COMMIT;

Answer 1

如果我理解正确，这是一个空白与孤岛的问题。

这应该做您想要的：

select p_key, p_status, p_user, p_cd, min(g_date) as start_dt,
       (case when max_g_date = max(g_date) then date '4712-12-31' else max(g_date) end) as end_dt,
       (case when max_g_date = max(g_date) then 1 else 0 end) as latest_row_flag
from (select wa.*,
             row_number() over (partition by p_key order by g_date) as seqnum,
             row_number() over (partition by p_key, p_status, p_user, p_cd order by g_date) as seqnum_2,
             max(g_date) over () as max_g_date
      from work_audit wa
     ) wa
group by p_key, p_status, p_user, p_cd, (seqnum - seqnum_2), max_g_date
order by p_key, min(g_date);

Here是db <>小提琴。小提琴使用Postgres，因为Oracle在db <> fiddle上不能很好地工作。但是查询不会改变。

oracle通过比较分析功能

1 个答案: