Analytical query performance optimization

[v0y4g3r]

What type of enhancement is this?

Performance

What does the enhancement do?

-- first: over (partition by)
select t.* from(select a.*, row number () over (partition by <PARTITION_FIELD> order by <UPDATE_TIME> desc) rw
from a) t where t.rw = 1:

-- second: max by date
select t1.* from t1 inner join (
    SELECT max (create date) as create date, <MARK FIELD>
    FROM <SOME_TABLE> group by mark
) t2 on t1. create_date = t2.create_date and t1.mark=t2.mark

Implementation challenges

No response