How to use Rownum?

Hi everyone,
Suppose I am having 100,000 records, and i want to filter only 50,000 records.
How i can use rownum in OWB.
I think in join i can use it, other that else any other way
Regards
Rachit

tyr to use a view to reference the data and create rownum along with it.
in 9.2 we dont have a true support to analytic functions. using a view would be my chocie.

Similar Messages

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

How to use rownum=2 in update statement ?

Hi all,
we are migrating the data from mainframe to oracle. migration team extracted the data into flat file. we are using this flat file to load in oracle.Finacle have menu option to load data from flat file to corresponding oracle tables.whenever i given this flat file to Menu it will give error report like below if any rows have error.
here "A/c. Opening Matrix" is the error.
error report:-
A/c. Opening Matrix
The Above Error Was For record No: 1
A/c. Opening Matrix
The Above Error Was For record No: 2
we are extracting and storing all the error message and corresponding record no in shell script as below.
err_msg=`echo ${error_msg[i]}`
rec_num=`echo ${error_msg[i]}| cut -d: -f2`
we need to update the upload status either upload success or failure and error message in upload history table. iam writing the update statement as below.
update statement:-
update upld_hist set upld_status='ERR' ,upld_err='$err_msg' where rownum=$rec_num;
This is statement is updating only for rownum=1. other than this it is not updating the table. Please suggest me how to update the rows based on rownum?
Thanks,
Venkat Vadlamudi

868591 wrote:
Hi all,
we are migrating the data from mainframe to oracle. migration team extracted the data into flat file. we are using this flat file to load in oracle.Finacle have menu option to load data from flat file to corresponding oracle tables.whenever i given this flat file to Menu it will give error report like below if any rows have error.
here "A/c. Opening Matrix" is the error.
error report:-
A/c. Opening Matrix
The Above Error Was For record No: 1
A/c. Opening Matrix
The Above Error Was For record No: 2
we are extracting and storing all the error message and corresponding record no in shell script as below.
err_msg=`echo ${error_msg[i]}`
rec_num=`echo ${error_msg[i]}| cut -d: -f2`
we need to update the upload status either upload success or failure and error message in upload history table. iam writing the update statement as below.
update statement:-
update upld_hist set upld_status='ERR' ,upld_err='$err_msg' where rownum=$rec_num;
This is statement is updating only for rownum=1. other than this it is not updating the table. Please suggest me how to update the rows based on rownum?
Thanks,
Venkat VadlamudiUse Analytic ROW_NUMBER() ..
http://docs.oracle.com/cd/E11882_01/server.112/e26088/functions156.htm#i86310

How to have rownum in a report based on a view

How to use rownum in a report or tabular form?
I wanted to number the rows in a report. The most obvious way would be just stick
rownum in there. There is a view in a database1. It is merely select a,b,c from various
things joined together and order by pkey1.
Apex is in database2 so I have to create a view there across the link
like:
create or replace view SOME_VIEW as
select * from OTHER_VIEW@SOMELINK
alter view SOME_VIEW add constraint PK_SOME_VIEW
PRIMARY KEY (pkey1)
DISABLE NOVALIDATE;
The problem is if I try to include rownum in the query in the report I always get:
failed to parse SQL query:
ORA-01446: cannot select ROWID from, or sample, a view with DISTINCT, GROUP BY, etc.
There's no rowid, it knows that the primary key is Pkey1 so what is the problem?
I know it's rownum that it hates. Maybe I can just number these things some other
way. However it'd be good to figure out what it is griping about.
Anyone know?
Edited by: lake on Mar 12, 2011 9:36 AM

thanks!
Actually I made a mistake in testing. And it does work to do this:
in database1:
create or replace view VIEW1 as
select
rownum "SEQ", etc.
in database2:
create view VIEW2 as select * from VIEW1@mylink
How I screwed up testing that I don't know. I was calling the column NUM before....
this is good because you can create a report about the next so many of something, such as how many of
the next batch of mailings have address problems? For that you need to know in what order it will be done and
when to quit.
But I'm sure I will use the report rownum thing also. thanks very much.

How Oracle returns queries & using rownum

Hi, I need to limit query results using rownum, but my question is regarding how Oracle retrieves its data.
Assume I have a table containing 500 records and my query without using rownum will retrieve 62 of those records. The actual query will use rownum and limit results to 20.
I have a JSP that will display those first 20. It has a simple feature for pagination, a "next" button that will retrieve the next results. So far simple enough, going forwards is easy. But how about going back.
I am trying to work out the SQL for using a "previous" button, so for example, say records 40-60 are being displayed, and say the first record on that page has a primary key value of 200, what should the SQL be to retrieve the previous 20 records using rownum ? I ask because if I do:
select * from tablename where pri_key < 200 and rownum <=20;
I know it will retrieve 20 records, but would the query fetch its results from the beginning of the table or would it count backwards from 200 ? If it is the first way, how could I word the SQL query to go backwards from 200 ? I am pretty sure it will start from the beginning and thats what I don't want. I know there are pagination tags for jsp out there but I want to do this myself.
Thanks
Kevin
Message was edited by:
MrVen

First, you need to understand that rownum is only assigned when a record is selected for output, it has nothing to do with any sort of internal order of the table (like insertion order). The same row can have a different rownum even for two invocations of the same query on the same data if the optimizer chooses a different access path. The only way to get a repeatable set of rownum is to sort the records by some field.
Second, any SQL statement you issue will be executed essentially in isolation. Oracle has no idea what query you executed previously. So, your query:
SELECT *
FROM tablename
WHERE pri_key < 200 and
      rownum <=20;will select a random set of 20 rows wih a primary key less than 200. It is likely to be the first (i.e. lowest values of the pk) rows, but that is not guaranteed.
The cannonical way to paginate rows is something like:
SELECT col1, col2, ...
FROM (SELECT col1, col2, ..., rownum rn
      FROM (SELECT col1, col2, ...
            FROM table
            WHERE <conditions>
            ORDER BY pk) ti
      WHERE rownum <= :maxrownum) to
WHERE rn >= :minrownumThe innermost query (with the <condition>) selects the appropriate rows and sorts them, in this case by the pk.
The middle query (rownum <- :maxrownum) discards the rows that would be after the last record you want to display. By using the maxrownum here, it gives Oracle information that allows it to do a fast sort on the inner query if possible.
In a fast sort, Oracle will get the first maxrownum rows from the query and sort them, then when it gets the next row, it checks if it is less than the highest value already found. If it is, it slots it into the correct place and discards the highest value, otherwise it discards that row.
The outermost query simply discards the records where the row number after sorting is less than the minimum value.
Another alternative may be:
SELECT col1, col2, ...
FROM (SELECT col1, col2, ...,
             ROW_NUMBER() OVER(ORDER BY pk) rn
      FROM table
      WHERE <conditions>)
WHERE rn BETWEEN :minrownum AND :maxrownumdepending on your database version, and your actual query.
Note tha pagination like this is expensive.
HTH
John
The outermost

How to use Aggregate Functions during Top N analysis?

Say i want to find top 5 highest salaries and their totals and average. In that case how to use aggregate functions. Please give me an example on this.
Regards,
Renu
Message was edited by:
user642387

Hi,
Yes, you can do that with aggregate functions.
First, do a sub-query to retrieve all the salaries (in descending order), then say "WHERE ROWNUM <= 5" in the main query. Use the aggregate SUM and AVG functions in the main query.
Analytic functions are easier to use for jobs like this, once you get familiar with them. If you're not leaving the field this month, then it's probably worthwhile for you to get familiar with analytic functions.

How to use multipule join in update stmt

hi,
i have a query in mssql i want to translate it using oracle 11g r2 latest sysntex
UPDATE trips
SET locations = trips.city + ', ' + poi.city
FROM trips INNER JOIN poi
ON poi.trip_guid = trips.guid
where trips.trip_guid =1
UPDATE trips t
SET locations = t.city + ', ' + p.city
FROM poi p
ON p.trip_guid = t.guid
where t.trip_guid =1
please tel me how i can write it in oracel 11g r2
i also show there is mearge statmet is it sql or plsql
yours sincerely

update trips t
set locations = t.city || ', ' ||
(select p.city || e.allow
from poi p
, emp e
where p.trip_guid = t.guid AND e.id = t.id
update trips t
set locations = t.city || ', ' ||
(select p.city || e.allow
from poi p
left join emp e on e.id = t.id
where p.trip_guid = t.guid
1)are these both query same and correct if i want to upate all rows.
2) some body said following two query are different
if there is any theory then pls tel me. because i have to use rownum<2 to get the top most row rather than distinct
in few cases
at some other places.
-- works but look at the number of rows updated
UPDATE test t
SET (tablespace_name, extent_management) = (
SELECT DISTINCT u.tablespace_name, u.extent_management
FROM user_tables a, user_tablespaces u
WHERE t.table_name = a.table_name
AND a.tablespace_name = u.tablespace_name
AND t.table_name LIKE '%A%');
-- works properly
UPDATE test t
SET (tablespace_name, extent_management) = (
SELECT DISTINCT (u.tablespace_name, u.extent_management)
FROM user_tables a, user_tablespaces u
WHERE t.table_name = a.table_name
AND a.tablespace_name = u.tablespace_name)
WHERE t.table_name LIKE '%A%';
yours sincerely
Edited by: 944768 on Feb 20, 2013 5:36 AM
Edited by: 944768 on Feb 20, 2013 5:39 AM

How to use cursor in php?

for example:
CURSOR CUR_ORDER IS
select distinct a.sales_branch segment2,a.order_number,
a.delivery_id,
a.sold_to_customer_id customer_id,
a.bill_to_customer_id,
a.ship_to_customer_id,
a.purchase_order,to_char(a.ordered_date,'yyyy-mm-dd') order_date
from vv_ar_temp_tl a;
how to use it in php program?

Hi,
I do not know what exactly is Your question about. I'll try to give an overview:
1. "CURSOR CUR_ORDER IS" is PL/SQL syntax, not PHP
2. result of oci_parse call is in fact a CURSOR, so I think You already know how to use it.
3. if Your question is on how to pass cursor between PL/SQL and PHP, I use:
a) PL/SQL procedure:
CREATE OR REPLACE
PROCEDURE TEST_P (PO_REF_CURSOR OUT SYS_REFCURSOR) AS
BEGIN
OPEN PO_REF_CURSOR FOR -- Opens ref cursor for query
SELECT OBJECT_NAME, OBJECT_TYPE FROM USER_OBJECTS WHERE ROWNUM <= 5;
END;
b) in PHP:
$conn = ocinlogon($database_user, $database_passwd, $database); // connect database
$outrefc = ocinewcursor($conn); //Declare cursor variable
$mycursor = ociparse ($conn, 'begin test_p(:curs); end;'); // prepare procedure call
ocibindbyname($mycursor, ':curs', $outrefc, -1, OCI_B_CURSOR); // bind procedure parameters
$ret = ociexecute($mycursor); // Execute function
$ret = ociexecute($outrefc); // Execute cursor
$nrows = ocifetchstatement($outrefc, $data); // fetch data from cursor
ocifreestatement($mycursor); // close procedure call
ocifreestatement($outrefc); // close cursor
ocilogoff($conn); // close database connection
var_dump($data); // show content fo $data variable
Now $data contains arrays of columns with arrays of rows from query.
Hope it helps You,
Regards,
Pawel

Using ROWNUM to split a job in half?

Hi everyone,
I have a cursor in which I would like to only select half of the data so that this job can be run in two seperate jobs rather than one large one.
What is the best way to try this?
CURSOR C_POPULATE IS
SELECT TABLE1.ID, TABLE1.CODE, TABLE1.AMT
FROM TABLE1, TABLE2
WHERE TABLE2.TAB1_ID = TABLE1.IDTABLE2 has an unknown number of TAB1_ID's but only half of them should be selected. These IDs are not in sequence as they are a subgroup of TABLE1.ID taken using a different statement.
This doesn't work, I know, but something like this added on the end of the cursor:
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IS this even going to be possbile using ROWNUM at all? I don't think so.
What about finding this value - CEIL((MAX(ROWNUM)/2)) - and then putting it in a variable, having a count on every update and putting EXIT WHEN COUNT = V_HALF_ROWNUM?
If that would work, how would I go about starting the second job?
Thanks anyone,
fakelvis

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http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:10498431232211
C.

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I bought the AirPort Time Capsule to back up my MBP
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How to use Rownum?

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