Number of rows returned in a query

Is there a way to get the number of rows returned from a query without itterating through the itterator?
Thanks,
Yon

No.
Because rows are not all returned until you start interating.
Some times I have seen people do a count query before the normal query, this helps out if you need a count to set things up.

Similar Messages

How to get number of rows return in SELECT query

i'm very new in java, i have a question:
- How to get number of rows return in SELECT query?
(i use SQL Server 2000 Driver for JDBC and everything are done, i only want to know problems above)
Thanks.

make the result set scroll insensitve, do rs.last(), get the row num, and call rs.beforeFirst(), then you can process the result set like you currently do.
         String sql = "select * from testing";
         PreparedStatement ps =
          con.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
         ResultSet rs = ps.executeQuery();
         rs.last();
         System.out.println("Row count = " + rs.getRow());
         rs.beforeFirst();~Tim
NOTE: Ugly, but does the trick.

How to restrict number of rows returned in a query

Hi frnds,
I'd like to restrict number of rows returned by my query to some 10 rows. how to do that.When I try doing with the rownum<10 its giving results for a particular dept and that too some 6 rows only...btw I'm grouping my table and includes joins from many a table and am ordering the table results by a column.. How to do this..

776317 wrote:
Hi frnds,
I'd like to restrict number of rows returned by my query to some 10 rows. how to do that.When I try doing with the rownum<10 its giving results for a particular dept and that too some 6 rows only...btw I'm grouping my table and includes joins from many a table and am ordering the table results by a column.. How to do this..
TELL ME HOW MANY ROWS YOU HAVE IN TABLE?
Because you have only *6 rows* in you column, if you less than 10 rows then it displays only containied/exist rows. nothing much
select ename,empno from emp where rownum < 10;Thanks

Need to limit number of rows returned by a query

Hi. Is there a way to limit the rowsets returned to me in a query? I need to get the first 100, then the next hundred, etc until there are no more rows left to retrieve. Someone told me that I should use a cursor to do this. Does anyone have a specific example? Can this be done with a combination of SQL/JDBC?
Thanks in advance...bbetta
null

if you are talking about limiting the number of rows to be returned to the calling program to a managable number of rowa ...
for example the result set size would be 5000 rows and you want to get them in batches of 50 or 100 ..
see the attached link :
JDBC Code Templates
http://technet.oracle.com/sample_code/tech/java/sqlj_jdbc/htdocs/templates.htm#BatchSize
if you want the server side transaction to only return the first 50 or 100 rows even though the result set has more ... then
another approach is required -- possibly as suggested above ...

Output the number of rows returned in a query

How do I find out the number of rows that are returned in a query?
COUNT function I guess can only be used when there is only one table involved. How do I do it for multi table query like JOIN?
For example
SELECT emp.first_name, emp.last_name, jobs.age FROM employees emp, jobs
WHERE emp.employee_id=jobs.employee_id

Hi,
You can get the num of rows info
select count(*) from (SELECT emp.first_name, emp.last_name, jobs.age FROM employees emp, jobs
WHERE emp.employee_id=jobs.employee_id) ;
regards
Jafar
http://www.oracledbarea.blogspot.com

Limiting number of rows returned by SQVI

I've created a query in SQVI and I need to limit the number of rows returned by the query. (I'm using the query as an exploratory tool, and it's not easy to predict how many records will be returned based on the selection fields I'm using.)
Is there any way to add a 'Maximum No. of Hits' field to the SQVI selection screen similar to what is found when using SE16?
Thanks,
Bob

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.

Is it possible to count the rows returned from a query?

Hello,
When using JDBC is there anyway of finding out the number of
rows returned from a query before actually getting each row?
In Forms 4.5 you can use the count_query function, does anyone
know of an equivalent function or work around in JDBC and/or
SQLJ?
Thanks.
null

Pasi Hmlinen (guest) wrote:
: Try
: SELECT COUNT(*) FROM the_table WHERE <conditions>;
: Hope this helps,
: Pasi
Thanks for the advice, I'm currently using SELECT COUNT(*) but
I'm looking for a more efficient way of doing it. If I SELECT
COUNT each time then I have to prepare and execute a SQL
statement each time. What I want to do it execute a single SQL
statement to return my results and somehow find out the number
of rows in the resultset without having to go back to the
database.
Gethin.
null

Getting the number of rows returned from ResultSet

Hi,
Does anyone know a method to get the number of rows returned with a query using the Resultset class?
Thanks.

Hi 281080,
If your database and JDBC driver support it, in order to use the solution that da-alexj has suggested, you need to create a 'scrollable' "ResultSet" -- the javadoc for method "createStatement()" (in class "java.sql.Connection") has more details.
However, I have found with Oracle 8.1.7.4 database and Oracle (thin) JDBC driver, that part of their implementation of the "last()" method (in class "java.sql.ResultSet") is to actually iterate through the entire "ResultSet" in order to reach the last row. If your "ResultSet" is very large (I tested it with a 100,000 row "ResultSet"), this will take a long time.
Just wanted to make you aware of that.
Of-course, this may be irrelevant to you since I didn't see any mention in your post of what database and JDBC driver you are using.
Hope this has helped you, anyway.
Good Luck,
Avi.

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 to get total number of rows return by query

hi all
i am using forms 6i with oracle 10G in windows environment....
i have a tabular form now i want to know that how many rows return by the query...like when user click on enter query and then give any search criteria and then execute query..it displays the records but i want to count the records that how many rows are return.............
hope you understant what i mean
Thanks in advance
Regards

U can use
"Select count(*) from <table> where <condition>"
<condition> is the where clause being used during "Execute Query"
this will give u the no of records in query.
And second option is to take a summary column. whose function is set "COUNT" and
"Summarized item" should contain a column that will never be blank. After execute query this column will give u no of records in block.
Regards....

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

Get Number of rows from a sql query.

I am reading data from a sql query in a BLS transaction and I would like to know the number of rows returned.
Is there an easy way to do this without looping through the table?
Thanks Jasper

Hi Jasper,
You can use the XPATH count function similar to this:
GetTagList.Results{count(/Rowsets/Rowset/Row)}
Kind Regards,
Diana Hoppe

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.

Restrict number of rows returned in a report

Hi All
Does anyone know how to restrict the number of rows returned in a report eg. I want to do a couple of reports based on opportunities/products and return only the top 5 or 10???
Thanks
Gail

Sorry just answered my own question by using the 'is in top' colum filter!

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

Number of rows returned in a query

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