select top 10 for each rownumber

Question

Query #1 returns thousands of rows for each skid. I like to know if there is a faster way select only top 10 for each skid. query #2 is slow. Is there is any way I can optimize in query #1 to make it faster?

query #1

select skid, date_run, price, ROW_NUMBER()over(PARTITION BY 
skid ORDER BY date_run ASC) as rowid 
from stocktrack where rsi is null

query #2

with ctevalue
(select skid, date_run, price, ROW_NUMBER()over(PARTITION BY 
skid ORDER BY date_run ASC) as rowid 
from stocktrack where rsi is null
)
select skid, date_run rowid
from ctevalue
where rowid < 11

Answer 1

Did you try

select 
  * 
from
  (select 
    skid, date_run, price, ROW_NUMBER() over (PARTITION BY skid ORDER BY date_run ASC) as rowid 
  from 
    stocktrack where rsi is null) data
where
  data.rowid < 11

Hope this helps

Answer 2

Try using cross apply :

select st.skid, st.date_run, st.price
from sktable sk cross apply
     (select top 10 st.*
      from stocktrack st2
      where st2.skid = sk.skid and
      order by date_run asc
     ) st

along with an index on stocktrack(skid, date_run, price) .

The first table is wherever the skid is referring to. If necessary, you could try (select distinct skid from stocktrack st) .