[英]How to calculate changes in Oracle sql
我有带有以下各列的下表:
HID_1 HID_2 Attr1 Attr2 Attr3 Attr4 Attr5
123 111 wo e ak ERR 20180630
123 111 wo e ak ERR 20180730
123 111 wo e ak ERR 20180830
123 111 qe e ak ERR 20180930
123 111 qe e ak ERR 20181030
123 111 aa a ak ERR 20181130
其中HID_1和HID_2是哈希ID广告,另外4列由group by语句定义,最后一个是time_id(每月的最后一天的日期)。 总的来说,在此表中,我有许多具有许多不同HID的记录。
我想将HID_2的许多更改(在Attr1-Attr4中)作为单独的列。 根据第一个示例,答案应该是这样的:
HID_1 HID_2 Attr1 Attr2 Attr3 Attr4 Attr5 Attr6
123 111 wo e ak ERR 20180630 0
123 111 wo e ak ERR 20180730 0
123 111 wo e ak ERR 20180830 0
123 111 qe e ak ERR 20180930 1
123 111 qe e ak ERR 20181030 0
123 111 aa a ak ERR 20181130 2
如何在Oracle sql数据库中执行操作?
尝试这个:
select t.*
, case when attr1 != LAG(attr1, 1, attr1) OVER (PARTITION BY hid_1, hid_2 ORDER BY attr5) then 1 else 0 end +
case when attr2 != LAG(attr2, 1, attr2) OVER (PARTITION BY hid_1, hid_2 ORDER BY attr5) then 1 else 0 end +
case when attr3 != LAG(attr3, 1, attr3) OVER (PARTITION BY hid_1, hid_2 ORDER BY attr5) then 1 else 0 end +
case when attr4 != LAG(attr4, 1, attr4) OVER (PARTITION BY hid_1, hid_2 ORDER BY attr5) then 1 else 0 end as attr6
from t
我想你要:
select t.*,
dense_rank() over (partition by hid_1, hid_2 order by min_attr5) as attr6
from (select t.*,
min(attr5) over (partition by hid_1, hid_2, , attr1, attr2, attr3, attr4, seqnum_2 - seqnum) as min_attr5
from (select t.*,
row_number() over (partition by hid_1, hid_2 order by attr5) as seqnum,
row_number() over (partition by hid_1, hid_2, attr1, attr2, attr3, attr4 order by attr5) as seqnum_2
from t
) t;
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