There are at least two different approaches which can be taken to return the first record in a group - in our working example the date when each page was first viewed and the IP address associated with that event. The important point here is that it uses a subquery to do the ordering first, and then the outer query performs the rownum limiting. Here is what we're going to explain. ORACLE Query to return First Row for a DataSet I'm writing a query which would return first row of a set of grouped data. The code on this page shows how to use Oracle PL/SQL to retrieve the top 1 record. SQL to return the first record in a group. FIRST_VALUE is an analytic function. How to get the top value from a table. Previous: Write a query to check if the first_name fields of the employees table contains numbers Next: Write a query to get monthly salary (round 2 decimal places) of all employees. Oracle Database has most likely copied the entire table into TEMP and written it out, just to get the first 10 rows. Something like this can also indicate the first and last rows as you query... SQL> select empno, ename, hiredate 2 ,case row_number() over (order by hiredate) 3 when 1 then 'First Row' 4 when count(*) over then 'Last Row' 5 end as flag 6 from emp; EMPNO ENAME HIREDATE FLAG ----- ----- ----- ----- 7369 SMITH 17/12/1980 00:00:00 First Row 7499 ALLEN 20/02/1981 00:00:00 7521 WARD … The first approach is to use an embedded select. Clean up (release) the temporary extents as you are finished with them. You could change this query to suit your needs. Without the NO_WAIT parameter, Oracle Forms keeps trying to obtain a lock without letting the operator cancel the process. How to Write an Oracle Pagination Query Now, that is a lot of I/O. My requirement is to get each client's latest order, and then get top 100 records. This query will get the first 10 records. How to get a value from a single cell of a table by Oracle functions. Oracle has ROWNUM, so first query can be simplified – Bulat Sep 5 '14 at 11:42 1 @Bulat using row_number is more safe than using rownum, analytic function apply to the result set after the result set got ready, but oracle docs don't tell us when rownum is generated – neshkeev Sep 5 '14 at 12:19 Contribute your code (and comments) through Disqus. This setting is useful for data densification. Internal query works fine. This is a variant of a top-1 query, as you may have noticed. I tried using OVER PARTITION BY clause, but somehow I'm not getting the desired result :select row_number() OVER(PARTITION BY leafv , value_group , l1d ,l2d ,l3d ,l4d ,l5d ,l6d ,l7d order by leafv , value_group , It returns the first value in an ordered set of values. Merge the temporary extents back to get the first 10 records when they are requested. If the first value in the set is null, then the function returns NULL unless you specify IGNORE NULLS. Different SQL syntax for Oracle 8i, 9i, 10g, 11g, and above. But I don't know how to get first 100 based on the results. The rownum is assigned after the ORDER BY because it’s in the outer query. Have another way to solve this solution? I wrote one query as below to get latest orders for each client. When you use NO_WAIT, Oracle Forms displays a dialog to notify the operator if a record cannot be reserved for update immediately. 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