更新时间:2022-10-17 09:13:43
如果我正确地理解了您的问题,那么我认为下面的SQL将执行您所需的操作:
SELECT id,account_number,app_guid,time_event_published,oldest_time_event_published
FROM(
SELECT id,account_number,app_guid,time_event_published,
RANK()OVER(PARTITION BY app_guid ORDER BY time_event_published DESC)dest_rank,
MIN(time_event_published)OVER(PARTITION BY app_guid)oldest_time_event_published
FROM event where account_number = 2152331553409959696
)where dest_rank = 1;
让我知道它如何处理您的数据并让我们知道。
我还没有用样本数据进行测试,但我非常有信心它会适用于您!
Ted。
I checked the following questions:
Fetch the row which has the Max value for a column
Columns : account_number, app_guid, time_event_published(epoch time).
I want the latest row of each app_guid
for a given account_number
PLUS oldest time_event_published
of the same account_number
for each app_guid
in another column of the latest row.
SELECT id, account_number, app_guid, time_event_published , <oldest_time_event_published_for_2152331553409959696> FROM (
SELECT id, account_number, app_guid, time_event_published,
RANK() OVER (PARTITION BY app_guid ORDER BY time_event_published DESC) dest_rank
FROM event where account_number=2152331553409959696
) where dest_rank = 1;
I am only able to think of another DB hit with same query with ASC
. Is there any other way and how to approach this requirement?
DB Entries:
2152331553409959696, TEST-ONE-APP_GUID, 25-JAN
2152331553409959696, TEST-ONE-APP_GUID, 1-JAN
2152331553409959696, TEST-TWO-APP_GUID, 25-FEB
2152331553409959696, TEST-TWO-APP_GUID, 1-FEB
Required Result:
2152331553409959696, TEST-ONE-APP_GUID, 25-JAN, 1-JAN
2152331553409959696, TEST-TWO-APP_GUID, 25-FEB, 1-FEB
If I understood your question correctly then I think the below SQL will do what you require:
SELECT id, account_number, app_guid, time_event_published , oldest_time_event_published
FROM (
SELECT id, account_number, app_guid, time_event_published,
RANK() OVER (PARTITION BY app_guid ORDER BY time_event_published DESC) dest_rank,
MIN (time_event_published) OVER (PARTITION BY app_guid) oldest_time_event_published
FROM event where account_number=2152331553409959696
) where dest_rank = 1;
Let me know how it works with your data and let us know.
I haven't tested with sample data but I am pretty confident it will work for you!
Ted.