Query to get rows betwen x and y + table total row count

Question

Hi,
I try get rows between e.g. 100 and 150 when I sort by some column
My query is now like this
SELECT  *
FROM
  (SELECT a.*,
    row_number() OVER (ORDER BY OWNER ASC) rn,
    COUNT(1) over() mrn
  FROM (SELECT * FROM all_objects) a
WHERE ROWNUM BETWEEN least(100,mrn) AND 150It is not very fast if I run that kind select from big table
Any tips to optimize this query?
Regards,
Jari

Answer 1

Hi,
I'm so bad with SQL :(
Here is sample where I need that kind query.
http://actionet.homelinux.net/htmldb/f?p=100:504
It looks standard Apex report but it is not.
It is just test to use query to output html using htp package
I send parameter start row, max rows, column I like order by.
Now I do query for cursor
    /* Report query */
    l_sql := '
      SELECT * FROM(
        SELECT a.*, row_number() OVER (ORDER BY '
        || l_sort_col
        || ' '
        || l_sort_ord
        || ') rn, COUNT(1) over() mrn
        FROM(' || l_sql || ') a
      ) WHERE rn BETWEEN LEAST(' || l_start_row || ',mrn) AND ' || l_last_row
    ;Then I loop cursor and output html.
You can order report by click heading and there is that pagination
I did not know that I could find examples by "pagination query" =), thanks for that tip for both of you.
I know Apex have reports ,
but I need have features that Apex templates can not provide at least yet.
So I have study that generating html tables using custom package instead Apex report should be best approach to get layouts I need.
Regards,
Jari
Edited by: jarola on Jan 21, 2011 10:38 PM