How to use ROWNUM in query
There are 1000 records in the employee table.I need to display 50 records each time by the order of the employees' names. In order to get the employee records from the 51st to the 100nd in the table, I tried to use ROWNUM.
However, the following query doesn't do the job:
select first_name, last_name from employee where rownum < 101 and rownum >49 order by last_name, first_name
I currently use the following query:
select * from (
(select first_name, last_name from employee where rownum < 101 order by last_name, first_name)
Minus
(select first_name, last_name from employee where rownum < 50 order by last_name, first_name )
) order by 2,1
The query works but is quite complictated. I would like to know if there a simpler way to do so.
Thanks in advance.
Helena
The generally preferred query is something along the lines of
SELECT *
FROM ( SELECT a.*, rownum rn
FROM (<<your query>>) a
WHERE rownum <= <<MAX VALUE>>)
WHERE rn >= <<MIN VALUE>><<your query>> here would be
SELECT first_name, last_name
FROM employee
ORDER BY first_name, last_nameNote that if you wanted to use the MINUS construct, you would generally need to move the rownum clause outside the query that is doing the ORDER BY. The query
SELECT first_name, last_name
FROM employee
WHERE rownum < 101
ORDER BY first_name, last_namefetches the first 100 rows and then orders them, which is not generally what you want.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC
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