Can I limit the number of rows returned on a Select?

Can I limit the number of rows returned on a Select statement? I would be using JDBC in a Java program.

Use Java prepared statements with the equivalent of this SQL*plus script:
VARIABLE n number
EXEC :n := 3;
SELECT rownum FROM all_objects WHERE rownum <= :n;
    ROWNUM
         1
         2
         3
EXEC :n := 5;
SELECT rownum FROM all_objects WHERE rownum <= :n;
    ROWNUM
         1
         2
         3
         4
         5

Similar Messages

How can I limit the number of rows returned by a select stat

How can I limit the number of rows returned by a select
statement. I have a query where I return the number of stores
that are located in a given area.. I only want to return the
first twenty-five stores. In some instances there may be over
200 stores in a given location.
I know is SQL 7 that I can set the pagesize to be 25....
Anything similiar in Oracle 8i?
null

Debbie (guest) wrote:
: Chad Nale (guest) wrote:
: : How can I limit the number of rows returned by a select
: : statement. I have a query where I return the number of
: stores
: : that are located in a given area.. I only want to return the
: : first twenty-five stores. In some instances there may be
: over
: : 200 stores in a given location.
: : I know is SQL 7 that I can set the pagesize to be 25....
: : Anything similiar in Oracle 8i?
: If you are in Sql*Plus, you could add the statement
: WHERE rownum <= 25
: Used together with an appropriate ORDER BY you
: could get the first 25 stores.
Watch out. ROWNUM is run before ORDER BY so this would only
order the 25 selected
null

Need to know how to limit the number of rows returned on Oracle

MS SQL Server has a command called 'set row count'.
We are trying to find similar one on Oracle.
What we are trying to do is that instead of using rownum in the query statement, we would like to find way to limit the number of rows returned. I understand that we can use JDBC resultSet object, but that's not what we want.
I know Oracle has one called arraysize, but this would not limit the number of rows returned either.
Pease help.
Thanks

I understand that we can use JDBC resultSet object, but that's not what we want.I'm not sure which feature of ResultSet you use and which not.
But if this question has anything to do with JDBC (that's the forum where you put it), I'd recommend to use Statement.setMaxRows(). This will limit the count of rows which your statement will fetch into it's ResultSet.

How do you limit the number of rows return from query?

How do you limit the number of rows return from query? Do all databases support this kind of feature?

i think the standard is limit
to get the top 30
select * from mytable LIMIT 30;returns the first 30 rows
also if you want a range
select * from mytable LIMIT 10,30;returns 30 rows starting from 10
this last one is useful for displaying ranges... something similar happens in these forums when viewing topics and messages

How can I limit the number of rows in Oracle?

Hi All,
I am using very complex query where I join 6 table to fetch data from database.
I have requirement like fetching a first 10000 row and then fetching another records after 10000 and so on.
I just want to know how to fetch a limited number of rows using sql query. Moreover, I also want to know how to calculate the total number of row (alternative of count method because I don't want to query the database twice because its affect the performance).
Thanks in advance.
Regards,
Sunny

sunny@oimnewbie wrote:
Hi All,
I am using very complex query where I join 6 table to fetch data from database.
I have requirement like fetching a first 10000 row and then fetching another records after 10000 and so on.
I just want to know how to fetch a limited number of rows using sql query. Moreover, I also want to know how to calculate the total number of row (alternative of count method because I don't want to query the database twice because its affect the performance).
Thanks in advance.
Regards,
SunnyThis smells like a very fishy requirement based on a fundamental misunderstanding of how Oracle works. Could you explain why you want to arbitrarily limit the result set to 1000 rows? What will happen between that and getting the "next" 1000? What triggers getting the "next" 1000? and how do you define "next", since there is no ordering in a heap table.
I suspect we can make that requirement go away be presenting a better approach to the real issue.

How to limit the number of rows in a report

I have several reports with a number of parameters - date ranges etc.
Depending on the parameter values selected by the user the reports can return thousands of rows.
I would like to limit the number of rows returned to, say, 500. If more than 500 rows are returned by the query then display an error message requesting that the user enter more specific parameters.
Ideally for performance reasons it would be good to catch the error before the datafile is generated, but I don't know if this is possible. Alternatively a check in the template might do the job - using COUNT on the group?.

Hi Hugh,
In your query, you got to add rowum < 500 or some sort of DB specific limit to the row being returned,
this will help to stop the report to get more than 500 records and the report template wont have any restriction.
or
you can do that in template too, but i would not recommend.
In these both cases or in any case, you cannot give any meaningful error if it exceeds N rows,there is no option like this till now.

How do I limit the number of rows retrieved at a time using RefCursor?

I have a PL/SQL package in use, that returns a REF CURSOR. This is currently being used in a Forms 6i application. Now I want to develop an ASP.NET web application that displays exactly the same information as my Forms 6i module. In fact those two applications will be used concurrently for a while.
I looked at the sample code provided on otn.oracle.com and decided to use the OracleDataAdapter.Fill()-method to fill a dataset and bind that dataset to a pageable GridView. Now I wonder, whether this method retrieves ALL records of the query at once and how I can limit the number of rows fetched? The Select statement retrieves up to 10000 rows at a time. Most of the time, a user is only interested in the first 20-30 rows. Forms 6i fetches more rows as the user scrolls down, how can I implement the same behavior in ODP.NET?
- Markus

Excuse me, but the reply does not quite answer my question. Maybe I did not explain my concerns clear enough:
I understand the use of the two properties (RowSize and FetchSize) to reduce the amount of round trips needed to transfer the data - not the number of rows fetched in total. This would still lead to a situation where all rows are transferred, when I am using the OracleDataAdapter.Fill()-Method. Is this correct or did I misunderstand the function of this method?
I quote the otherwise really helpful article you send me:
Of course, there is a cost if the fetch size is arbitrarily large. More client-side memory and processor cycles will be needed to store and manage a larger amount of data. The goal is to find a high-performing balance between the number of round trips and the amount of data retrieved per trip.
My RowSize is for sure a bit larger than the one in the given example. The query will probably be used by up to 100 users at a time, so I would like to limit the resource-costs not only on the network by the number of round trips, but also on the web-server which is storing all these records in it's memory per user-request.

Limiting the number of rows returned by SQL or ResultSet

Hello,
I'm trying to limit the number of rows that my application receives to a user-specified value. The user is asked how many accounts they want returned and I want to limit my ResultSet to this amount. I'd prefer to set up the SQL to do this if possible rather than waste time returning more records than necessary to the ResultSet.
If it's not possible to limit the SQL, how can I limit the number when processing the ResultSet?
Or, is there any way to setup a cursor in JDBC without being able to use Stored Procedures?
I'm going up against DB2 using DB2Connect.
Thanks!

It's not surprising that you are confused because the documentation doesn't bother to explain what the "fetch size" actually is, it just says that setFetchSize sets it and getFetchSize gets it. As I understand it from some other documents I read about JDBC, the fetch size is a number that may be used internally by the JDBC driver. Here's an example of how I understand it (others, I know you will feel free to correct me if you disagree):
When the driver produces a result set with a very large number of records, it has to generate those records and deliver them to the system that requested them. If the database is not on the same system, then those records must all travel over the network. It could be a performance problem if you had to wait for (say) 80,000 records to travel across the network. Enter the fetch size. If you set the fetch size to 100, then the driver will bring the records across in batches of 100, as the program calls for them. Now, this buffering is transparent to your program; the driver doesn't tell you that it's getting another batch and you can't tell it to get another batch. So it is not a solution to the problem that everybody has here, namely how to display your records 10 per page and allow the user to go back and forth among those pages, like search engines do.

How to limit the number of rows in a smart form , sap script.

Can anyone tell me how to limit the number of rows in the output of a sap script/smart form. I have tried "protect/endprotect" in sap script but have no idea of how to do in smart form. In sap script the only way it has happened is by reducing the size of the main window.

Hi,
In Smartform also, why dont you try reducing the size of the window if you want to limit the rows in it. Also if you are printing Line Items in a LOOP, you can write
LOOP AT T_ITAB FROM 1 TO N in the LOOP Node if you know how many records exactly you want to display in 1 Page processing.
regards,
Mahesh

How can I limit the number of ros in TextArea?

As I turn on the line wrap and having used setRows method,
I cannot limit the number of rows of the textarea into 2.
How can I limit it?
Thanks.

camickr wrote:
I give up. You don't know specify requirements and I'm not going to prompt you every 5 minutes for more information.
due to setText method So this implies that the text comes from somewhere, maybe a database, but the user does not type the text directly into the text area.
If you define the text area with 2 rows, then the third row will not be visible, so I don't see the problem. Just don't add the text area to a scroll pane and the user will never know the third row is there.[http://i188.photobucket.com/albums/z55/nwoedf/temp/error.png ]
it demonstrates the problem with excess line
The third row is still visible even I have used setRow(2).

How can i now the number of rows afected by the last query?

how can i now the number of rows afected by the last query?
For example:
i made this update :
update trl_trial set status = 1 /* Validation */
where trial_id = cobject_id
and status = 0; /* Initial */
if NUMBERS_OF_ROWS = 0 then
end if;
how can i do this?
thank u!!!!

how can i now the number of rows afected by the last query?
For example:
i made this update :
update trl_trial set status = 1 /* Validation */
where trial_id = cobject_id
and status = 0; /* Initial */
if NUMBERS_OF_ROWS = 0 then
end if;
how can i do this?
thank u!!!! Do the following :
update trl_trial set status = 1 /* Validation */
where trial_id = cobject_id
and status = 0; /* Initial */
if(SQL%ROWCOUNT = 0 ) then
else
end if;
you can also declare a variable and do
myvar := SQL%ROWCOUNT;
SQL%ROWCOUNT returna the # of rows afected by any sql
statement, like DELETE, UPDATE

How can I limit the number of emails retained on my ipad air?

How can I limit the number of emails that are retained on my iPad Air? Because of legal requirements of a long-term project, I cannot permanently delete emails relating to that project from my ISP's mail server. My gmail account contains over 17,000 emails and, upon setting up my new iPad, and updating to ios 7.1.1, I now have all 17,000+ emails taking up space. I would like to limit the emails by count as I was able to do on my old iPad running ios 5.1.1 OR to retain them based on date range. I have not found any instructions on the support discussions or general iPad blogs that allow me to do that. Any way around this problem?
I also miss the 5.1.1 mail search feature that allowed me to narrow the search by from/to/subject/all. Does anyone know if that feature is available using some little-known ios 7.1.1 feature?
Thanks for your help.

jlfcba wrote:
IOS 7.1.1 doesn't show a "days to sync" parameter anywhere in SETTINGS/Mail,Contacts,Calendars/ACCOUNTS/GMAIL Account/ GMAIL Acccount Info. There is nothing in iTunes relating to such an option either. So, it seems I'm back to square one.
If you have a decent mail provider like Microsoft Hotmail or Outlook.com mail it does.
If you have Gmail it does not. Quite right. Gmail is rubbish.

HT2729 I have limited space on my new ipad. How can I limit the number of songs from my itunes on my imac from going to my ipad when I connect the two?

I have limited space on my new ipad. How can I limit the number of songs from my itunes on my imac from going to my ipad when I connect the two?

you can do this by keeping the external hard drive connected and doing the following
-hold shift key down on computer while opening iTunes and a prompt will appear to choose a library
-select choose library, iTunes should bring up your explorer windows where you can search for the external HD
-after you find the external HD find the iTunes folder you just copied to it
-after opening the iTunes folder look for the file that says iTunes library.itl or if you can't see that extenstion just look for a document looking thing in the iTunes folder that shows up as a database file
-double click the database file and boom iTunes should load your library without having to copy it to the computer
PS: do make sure that if you are going to do it this way, make sure that the external HD is connected at all times, because if you don't then you will get exclamation marks next to your iTunes songs
double PS: if you are unsure how to find out if the iTunes library file is a database file just right click it and choose properties and under the type it should say database file
hope this helps:)

Hi, how can I limit the number of emails I can see on my iPhone 5. Every time in delete one and older email gets added from my live.co.uk account (where I want to keep my 2500 emails) I just don't want many on my phone. Thanks

Hi, how can I limit the number of emails I can see on my iPhone 5. Every time in delete one and older email gets added from my live.co.uk account (where I want to keep my 2500 emails) I just don't want many on my phone. Thanks

You can't. Why on earth would you attempt to manage 2500 emails with setting up a folder structure or some means of doing so? Simply keeping them in an single inbox is not realistic, no matter what email client you use.

How can I limit the number of emails resident in Apple Mail?

How can I limit the number of emails resident in Apple Mail inbox?

jlfcba wrote:
IOS 7.1.1 doesn't show a "days to sync" parameter anywhere in SETTINGS/Mail,Contacts,Calendars/ACCOUNTS/GMAIL Account/ GMAIL Acccount Info. There is nothing in iTunes relating to such an option either. So, it seems I'm back to square one.
If you have a decent mail provider like Microsoft Hotmail or Outlook.com mail it does.
If you have Gmail it does not. Quite right. Gmail is rubbish.

Can I limit the number of rows returned on a Select?

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