Sql 因为你复制了所有的东西。问题中的一些数据是输入的，一些是预期的输出。对，我复制了所有数据。我认为重点是删除重复项。所以，复制所有这些似乎并不重要。如果您认为这是错误的，请提供示例输入，您认为输出应该是什么，以及为什么我的解决方案提供不正确的输出。Mark，
Sql 因为你复制了所有的东西。问题中的一些数据是输入的，一些是预期的输出。对，我复制了所有数据。我认为重点是删除重复项。所以，复制所有这些似乎并不重要。如果您认为这是错误的，请提供示例输入，您认为输出应该是什么，以及为什么我的解决方案提供不正确的输出。Mark，,sql,oracle,plsql,Sql,Oracle,Plsql,因为你复制了所有的东西。问题中的一些数据是输入的，一些是预期的输出。对，我复制了所有数据。我认为重点是删除重复项。所以，复制所有这些似乎并不重要。如果您认为这是错误的，请提供示例输入，您认为输出应该是什么，以及为什么我的解决方案提供不正确的输出。Mark，我感谢您的帮助。我已经对示例数据和期望的结果集进行了编辑。作为补充说明，您可能应该更改您的表，使attribute\u name成为指向某些内容的fk链接（实际上可能是atribute表中的记录）。这将（可能）节省您的空间，节省您的处理时间，并
因为你复制了所有的东西。问题中的一些数据是输入的，一些是预期的输出。对，我复制了所有数据。我认为重点是删除重复项。所以，复制所有这些似乎并不重要。如果您认为这是错误的，请提供示例输入，您认为输出应该是什么，以及为什么我的解决方案提供不正确的输出。Mark，我感谢您的帮助。我已经对示例数据和期望的结果集进行了编辑。作为补充说明，您可能应该更改您的表，使
attribute\u nameatributeattribute\u namecreate table issue_attributes (
issue_id number,
attr_timestamp timestamp,
attribute_name varchar2(500),
attribute_value varchar2(500),
CONSTRAINT ia-pk PRIMARY KEY (issue_id, attr_timestamp, attribute_name)
)
select issue_id, attr_timestamp, attribute_name, attribute_value
from issue_attributes where issue_id = 1 and attribute_name = 'OWNER';
1, 01-JAN-2011 12:00, 'OWNER', 'john.doe@example.com'
1, 01-FEB-2011 12:00, 'OWNER', 'john.doe@example.com'
1, 01-MAR-2011 12:00, 'OWNER', 'john.doe@example.com'
1, 01-APR-2011 12:00, 'OWNER', 'john.doe@example.com'
1, 01-JAN-2011 12:00, 'OWNER', 'john.doe@example.com'
2, 01-JAN-2011 12:00, 'OWNER', 'john.doe@example.com'
2, 01-FEB-2011 12:00, 'OWNER', 'jane.deere@example.com'
2, 01-MAR-2011 12:00, 'OWNER', 'john.doe@example.com'
2, 01-APR-2011 12:00, 'OWNER', 'john.doe@example.com'
2, 01-JAN-2011 12:00, 'OWNER', 'john.doe@example.com'
2, 01-FEB-2011 12:00, 'OWNER', 'jane.deere@example.com'
2, 01-MAR-2011 12:00, 'OWNER', 'john.doe@example.com'
SELECT MAX(attr_timestamp), issue_id, attribute_name, attribute_value
FROM issue_attributes
GROUP BY issue_id, attribute_name, attribute_value
SET search_path='tmp';
-- The rows you want to delete.
SELECT * FROM issue_attributes to_del
WHERE EXISTS (
SELECT * FROM issue_attributes xx
WHERE xx.issue_id = to_del.issue_id
AND xx.attribute_name = to_del.attribute_name
AND xx.attribute_value = to_del.attribute_value
AND xx.attr_timestamp > to_del.attr_timestamp
AND NOT EXISTS ( SELECT * FROM issue_attributes nx
WHERE nx.issue_id = to_del.issue_id
AND nx.attribute_name = to_del.attribute_name
AND nx.attribute_value <> to_del.attribute_value
AND nx.attr_timestamp > to_del.attr_timestamp
AND nx.attr_timestamp < xx.attr_timestamp
)
) ;
-- For completeness: the rows you want to keep.
SELECT * FROM issue_attributes must_stay
WHERE NOT EXISTS (
SELECT * FROM issue_attributes xx
WHERE xx.issue_id = must_stay.issue_id
AND xx.attribute_name = must_stay.attribute_name
AND xx.attribute_value = must_stay.attribute_value
AND xx.attr_timestamp > must_stay.attr_timestamp
AND NOT EXISTS ( SELECT * FROM issue_attributes nx
WHERE nx.issue_id = must_stay.issue_id
AND nx.attribute_name = must_stay.attribute_name
AND nx.attribute_value <> must_stay.attribute_value
AND nx.attr_timestamp > must_stay.attr_timestamp
AND nx.attr_timestamp < xx.attr_timestamp
)
) ;
issue_id | attr_timestamp | attribute_name | attribute_value
----------+---------------------+----------------+----------------------
1 | 2011-03-01 12:00:00 | OWNER | john.doe@example.com
1 | 2011-01-01 12:00:00 | OWNER | john.doe@example.com
1 | 2011-02-01 12:00:00 | OWNER | john.doe@example.com
2 | 2011-03-01 12:00:00 | OWNER | john.doe@example.com
(4 rows)
issue_id | attr_timestamp | attribute_name | attribute_value
----------+---------------------+----------------+------------------------
1 | 2011-04-01 12:00:00 | OWNER | john.doe@example.com
2 | 2011-02-01 12:00:00 | OWNER | jane.deere@example.com
2 | 2011-04-01 12:00:00 | OWNER | john.doe@example.com
2 | 2011-01-01 12:00:00 | OWNER | john.doe@example.com
(4 rows)
SQL> desc issue_attributes
Name Null? Type
----------------------------------------------------------------- -------- --------------------------------------------
ISSUE_ID NUMBER
ATTR_TIMESTAMP TIMESTAMP(6)
ATTRIBUTE_NAME VARCHAR2(500)
ATTRIBUTE_VALUE VARCHAR2(500)
SQL> select * from issue_attributes;
ISSUE_ID ATTR_TIMESTAMP ATTRIBUTE_ ATTRIBUTE_VALUE
---------- ----------------------------------- ---------- ------------------------------
1 01-JAN-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-FEB-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-MAR-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-APR-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-JAN-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-JAN-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-FEB-20 11.12.00.000000 AM OWNER jane.deere@example.com
1 01-MAR-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-APR-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-JAN-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-FEB-20 11.12.00.000000 AM OWNER jane.deere@example.com
1 01-MAR-20 11.12.00.000000 AM OWNER john.doe@example.com
12 rows selected.
SQL> delete from issue_attributes
where rowid in(select rid
from (select rowid rid,
row_number() over (partition by ISSUE_ID,
ATTR_TIMESTAMP,
ATTRIBUTE_NAME,
ATTRIBUTE_VALUE
order by rowid) rn
from issue_attributes)
where rn<> 1);
7 rows deleted.
SQL> select * from issue_attributes;
ISSUE_ID ATTR_TIMESTAMP ATTRIBUTE_ ATTRIBUTE_VALUE
---------- ----------------------------------- ---------- ------------------------------
1 01-JAN-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-FEB-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-MAR-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-APR-20 11.12.00.000000 AM OWNER john.doe@example.com
1 01-FEB-20 11.12.00.000000 AM OWNER jane.deere@example.com
5 rows selected.
with issue_attributes as (
select 1 as issue_id, date '2011-01-01' as attr_timestamp,
'OWNER' as attribute_name, 'john.doe@example.com' as attribute_value from dual union all
select 1 as issue_id, date '2011-02-01' as attr_timestamp,
'OWNER' as attribute_name, 'john.doe@example.com' as attribute_value from dual union all
select 1 as issue_id, date '2011-03-01' as attr_timestamp,
'OWNER' as attribute_name, 'john.doe@example.com' as attribute_value from dual union all
select 1 as issue_id, date '2011-04-01' as attr_timestamp,
'OWNER' as attribute_name, 'john.doe@example.com' as attribute_value from dual union all
select 2 as issue_id, date '2011-01-01' as attr_timestamp,
'OWNER' as attribute_name, 'john.doe@example.com' as attribute_value from dual union all
select 2 as issue_id, date '2011-02-01' as attr_timestamp,
'OWNER' as attribute_name, 'jane.deere@example.com' as attribute_value from dual union all
select 2 as issue_id, date '2011-03-01' as attr_timestamp,
'OWNER' as attribute_name, 'john.doe@example.com' as attribute_value from dual union all
select 2 as issue_id, date '2011-04-01' as attr_timestamp,
'OWNER' as attribute_name, 'john.doe@example.com' as attribute_value from dual
)
select
issue_id,
attr_timestamp,
attribute_name,
attribute_value,
case when lag(attribute_value) over (partition by issue_id, attribute_name order by attr_timestamp) = attribute_value then null else 'Y'end as keep_value
from
issue_attributes
ISSUE_ID ATTR_TIMESTAMP ATTRIBUTE_NAME ATTRIBUTE_VALUE KEEP_VALUE
1 01/01/2011 OWNER john.doe@example.com Y
1 01/02/2011 OWNER john.doe@example.com
1 01/03/2011 OWNER john.doe@example.com
1 01/04/2011 OWNER john.doe@example.com
2 01/01/2011 OWNER john.doe@example.com Y
2 01/02/2011 OWNER jane.deere@example.com Y
2 01/03/2011 OWNER john.doe@example.com Y
2 01/04/2011 OWNER john.doe@example.com