Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations strongm on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
LIMIT ROWS RETRIEVED USING SQL 1
- Thread starter Queryman
- Start date
-
1
- #2
In SQL:1999 there's a ROW_NUMBER function, but it's not yet included (you'll have to wait until V2R5 in December).
But you can achieve the same result using
select * from table
qualify sum(1) over (order by col
rows unbounded preceding) <= 10
or
qualify rank() over (order by col) <= 10
As QUALIFY is no standard SQL you'll have to use a derived table to be ANSI compliant:
select ... from
(select ..., rank() over (order by col) AS rownum
from table) dt
where rownum <= 10
If you don't care about the order (and about ANSI SQL) use a SAMPLE clause, this will be the fastest way:
sel * from table sample 10
Dieter
But you can achieve the same result using
select * from table
qualify sum(1) over (order by col
rows unbounded preceding) <= 10
or
qualify rank() over (order by col) <= 10
As QUALIFY is no standard SQL you'll have to use a derived table to be ANSI compliant:
select ... from
(select ..., rank() over (order by col) AS rownum
from table) dt
where rownum <= 10
If you don't care about the order (and about ANSI SQL) use a SAMPLE clause, this will be the fastest way:
sel * from table sample 10
Dieter
- Thread starter
- #3
- Status
Similar threads
- Locked
- Question