Dumb Question: Count of Rows Returned?
I am using a dbcontrol to get rows from the database. I am using the netui-repeater to display the results. The repeater datasource is "request.results".
My question is how do I get the total number of records returned from the query?
I know this is should be a simple thing, but I have been unable to get the number.
Thanks...
Suggested implementation:
typedef void (^MSCountQueryBlock)(NSInteger resultCount,
NSError *error);
/// Sends a request to the Windows Azure Mobile Service to return the row count/// from the table that meet the conditions of the given predicate.
-(void)countRowsWithPredicate:(NSPredicate *) predicate
completion:(MSCountQueryBlock)completion;
Similar Messages
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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.
nullPasi 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 -
How to run a select count(*) with multiple rows returned
Hi,
I have to run a select count(*) for different reports.
1) Select count(*) from table
where state = 'CA'
2) Select count(*) from table
where state = 'NY'
3) Select count(*) from table
where state = 'NV'
Instead of running this query again for 50 times, is there a way for me to just put it in one query and get multiple row returns? Thank you.Samantha wrote:
Hi,
I have to run a select count(*) for different reports.
1) Select count(*) from table
where state = 'CA'
2) Select count(*) from table
where state = 'NY'
3) Select count(*) from table
where state = 'NV'
Instead of running this query again for 50 times, is there a way for me to just put it in one query and get multiple row returns? Thank you.select state, count(*) from table group by state order by 1; -
Question about number of rows returned in PL/SQL , SQL
The Child Table has 3 Million plus records, but the loaded table only brings back
approximately 1.2 Million records. Is there anything on the Oracle side that would limit the number of rows returned.Would it be possible to post a test case that explains what you're seeing? It sounds like you are indicating that
SELECT COUNT(*) FROM <<some table>>returns 3 million rows. When some process goes to load a Teradata table by extracting all the information from this Oracle table, the Teradata table ends up with only 1.2 million rows. Is that correct?
If so,
- What is the ETL process?
- Is it possible that the ETL process is encountering an error midway through?
- Is it possible that the ETL process is extracting a subset of the data through a WHERE clause?
- Is the ETL process logging in as the same Oracle user you're using to do the COUNT(*)?
Justin -
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. -
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.
ThanksI 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. -
Question:
There is a scenario that users want to send multiple rows returned by Execute SQL Task as Email content to send to someone. With Execute SQL Task, the Full result set is used when the query returns multiple rows, it must map to a variable of the Object data
type, then the return result is a rowset object, so we cannot directly send the result variable as Email content. Is there a way that we can extract the table row values that are stored in the Object variable as Email content to send to someone?
Answer:
To achieve this requirement, we can use a Foreach Loop container to extract the table row values that are stored in the Object variable into package variables, then use a Script Task to write the data stored in packages variables to a variable, and then set
the variable as MessageSource in the Send Mail Task.
Add four variables in the package as below:
Double-click the Execute SQL Task to open the Execute SQL Task Editor, then change the ResultSet property to “Full result set”. Assuming that the SQL Statement like below:
SELECT Category, CntRecords
FROM [table_name]
In the Result Set pane, add a result like below (please note that we must use 0 as the result set name when the result set type is Full result set):
Drag a Foreach Loop Container connects to the Execute SQL Task.
Double-click the Foreach Loop Container to open the Foreach Loop Editor, in the Collection tab, change the Enumerator to Foreach ADO Enumerator, then select User:result as ADO object source variable.
Click the Variable Mappings pane, add two Variables as below:
Drag a Script Task within the Foreach Loop Container.
The C# code that can be used only in SSIS 2008 and above in Script Task as below:
public void Main()
// TODO: Add your code here
Variables varCollection = null;
string message = string.Empty;
Dts.VariableDispenser.LockForWrite("User::Message");
Dts.VariableDispenser.LockForWrite("User::Category");
Dts.VariableDispenser.LockForWrite("User::CntRecords");
Dts.VariableDispenser.GetVariables(ref varCollection);
//Format the query result with tab delimiters
message = string.Format("{0}\t{1}\n",
varCollection["User::Category"].Value,
varCollection["User::CntRecords"].Value
varCollection["User::Message"].Value = varCollection["User::Message"].Value + message;
Dts.TaskResult = (int)ScriptResults.Success;
The VB code that can be used only in SSIS 2005 and above in Script Task as below, please note that in SSIS 2005, we should
change PrecompileScriptIntoBinaryCode property to False and Run64BitRuntime property to False
Public Sub Main()
' Add your code here
Dim varCollection As Variables = Nothing
Dim message As String = String.Empty
Dts.VariableDispenser.LockForWrite("User::Message")
Dts.VariableDispenser.LockForWrite("User::Category")
Dts.VariableDispenser.LockForWrite("User::CntRecords")
Dts.VariableDispenser.GetVariables(varCollection)
'Format the query result with tab delimiters
message = String.Format("{0}" & vbTab & "{1}" & vbLf, varCollection("User::Category").Value, varCollection("User::CntRecords").Value)
varCollection("User::Message").Value = DirectCast(varCollection("User::Message").Value,String) + message
Dts.TaskResult = ScriptResults.Success
End Sub
Drag Send Mail Task to Control Flow pane and connect it to Foreach Loop Container.
Double-click the Send Mail Task to specify the appropriate settings, then in the Expressions tab, use the Message variable as the MessageSource Property as below:
The final design surface like below:
References:
Result Sets in the Execute SQL Task
Applies to:
Integration Services 2005
Integration Services 2008
Integration Services 2008 R2
Integration Services 2012
Integration Services 2014
Please click to vote if the post helps you. This can be beneficial to other community members reading the thread.Thanks,
Is this a supported scenario, or does it use unsupported features?
For example, can we call exec [ReportServer].dbo.AddEvent @EventType='TimedSubscription', @EventData='b64ce7ec-d598-45cd-bbc2-ea202e0c129d'
in a supported way?
Thanks! Josh -
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
GailSorry just answered my own question by using the 'is in top' colum filter!
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How to get the number of rows returned by a report?
Hi,
I'm developing my first application in APEX and so far everything seems fine, except I can't figure out this very simple thing: I have a report based on a PL/SQL block returning an SQL string. I'd like to have a message (something like "X rows returned") just before the report. The closest thing I could find was "X to Y out of Z" in the pagination styles, but that's not what I want. Also I don't think running the same query to get COUNT() is wise.
Any help would be appreciated.
Thanks,
KonstantinMy guess is that it only shows the number of rows it has retrieved. I believe the defailt is for it to only retrieve 50 rows and as you page through your report it retrieves more. So this would just tell you how many rows was retireved, but probably not how many rows the report would contain if you pages to the end. Oracle doesn't really have a notion of total number of rows until the whole result set has been materialized.
-
Hi There,
I am trying to create a measure in cube browser which will return count of rows of a table. If there are some rows, it returns correct result but in other case if table is empty, it returns nothing.
I want to return 0 in later case.
Please advise.You could create a Measure with code. Something like this, it is made in AdventureWorks2014.
CREATE MEMBER CurrentCube.Measures.[Count Rows Dimension] AS
CoalesceEmpty(COUNT([Customer].[Customer].[Customer]),0),
Associated_Measure_Group = 'Measure Group you want it associated to'; -
Count of Rows Displayed after Filter Applied
Hi,
I have a WebI report where I am manually filtering the data displayed within the report based on user input. For example, a user enters a Max Value and I am filtering out all employees who have a total value (mulitple rows summed up) greater than the prompt value.
The issue I am facing is displaying a row count at the top of the report in a free-standing cell. Normally I would simply use count(Field;All) but since the number of rows returned by the query is different from the number of rows actually displayed in the table, this option isn't available.
Any ideas would be greatly appreciated.
Thanks!
JeffHi Jeff,
Try creating a formula in the cell, or a variable with a "Where" clause and add the correct context, using "In" or "ForEach". Or you may be able to do it in the formula in the cell. Or you may need to use the "UserResponse" function, depending on what you are trying to do.
Thanks
Edited by: wavery on Feb 15, 2011 9:14 PM -
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
RegardsU 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.... -
Problem with Top N Query when no rows returned (takes forever)
I have a table with 100 Million rows and I want to get the latest N records using:
SELECT * FROM
(SELECT * FROM tablename WHERE columnA= 'ABC' ORDER BY TIME DESC)
WHERE rownum <= N;
This works fine and is very fast when there are rows with columnA= 'ABC' but when there are no rows with columnA= 'ABC' the query takes forever.
The strange things is that the inner query returns immediately when run on it's own when no rows with columnA= 'ABC' exist e.g.
SELECT * FROM tablename WHERE columnA= 'ABC' ORDER BY TIME DESC
So why does it take for ever for to run:
SELECT * FROM (no rows inner query) WHERE rownum <= N;
I have also tried using:
SELECT * FROM
(SELECT columnA, rank() over(ORDER BY TIME DESC) time_rank
FROM tablename WHERE columnA='ABC')
WHERE time_rank <= N;
which returns instantly when there are now rows but takes much longer than the first query when there are rows.I cannot see a real difference:With histogram we can see a difference on the elapse when no row returned and into explain plan.
SQL> drop table tablename
2 /
Table dropped.
Elapsed: 00:00:00.03
SQL>
SQL> create table tablename
2 as
3 select sysdate - l time
4 , decode(trunc(dbms_random.value(1,10)),1,'ABC',2,'DEF',3,'GHI',4,'JKL','MNO') as columnA
5 from (select level l from dual connect by level <= 1000000)
6 /
Table created.
Elapsed: 00:01:19.08
SQL>
SQL> select columnA,count(*) from tablename group by columnA
2 /
COL COUNT(*)
ABC 110806
DEF 111557
GHI 111409
JKL 111030
MNO 555198
Elapsed: 00:00:05.05
SQL>
SQL> create index i1 on tablename(time)
2 /
Index created.
Elapsed: 00:00:34.08
SQL>
SQL> create index i2 on tablename(columna)
2 /
Index created.
Elapsed: 00:00:30.08
SQL>
SQL> exec dbms_stats.gather_table_stats(user,'TABLENAME',cascade=>true)
PL/SQL procedure successfully completed.
Elapsed: 00:01:18.09
SQL>
SQL> set autotrace on explain
SQL> SELECT * FROM
2 (SELECT * FROM tablename WHERE columnA= 'ABC' ORDER BY TIME DESC)
3 WHERE rownum <= 10
4 /
TIME COL
17/09/06 ABC
12/09/06 ABC
08/09/06 ABC
07/09/06 ABC
25/08/06 ABC
22/08/06 ABC
13/08/06 ABC
08/07/06 ABC
14/06/06 ABC
01/05/06 ABC
10 rows selected.
Elapsed: 00:00:01.04
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2364 Card=10 Bytes=120)
1 0 COUNT (STOPKEY)
2 1 VIEW (Cost=2364 Card=200000 Bytes=2400000)
3 2 SORT (ORDER BY STOPKEY) (Cost=2364 Card=200000 Bytes=2400000)
4 3 TABLE ACCESS (FULL) OF 'TABLENAME' (Cost=552 Card=200000 Bytes=2400000)
SQL>
SQL> SELECT * FROM
2 (SELECT * FROM tablename WHERE columnA= 'MNO' ORDER BY TIME DESC)
3 WHERE rownum <= 10
4 /
TIME COL
20/09/06 MNO
19/09/06 MNO
16/09/06 MNO
14/09/06 MNO
13/09/06 MNO
10/09/06 MNO
06/09/06 MNO
05/09/06 MNO
03/09/06 MNO
02/09/06 MNO
10 rows selected.
Elapsed: 00:00:02.04
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2364 Card=10 Bytes=120)
1 0 COUNT (STOPKEY)
2 1 VIEW (Cost=2364 Card=200000 Bytes=2400000)
3 2 SORT (ORDER BY STOPKEY) (Cost=2364 Card=200000 Bytes=2400000)
4 3 TABLE ACCESS (FULL) OF 'TABLENAME' (Cost=552 Card=200000 Bytes=2400000)
SQL>
SQL> SELECT * FROM
2 (SELECT * FROM tablename WHERE columnA= 'PQR' ORDER BY TIME DESC)
3 WHERE rownum <= 10
4 /
no rows selected
Elapsed: 00:00:01.01
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2364 Card=10 Bytes=120)
1 0 COUNT (STOPKEY)
2 1 VIEW (Cost=2364 Card=200000 Bytes=2400000)
3 2 SORT (ORDER BY STOPKEY) (Cost=2364 Card=200000 Bytes=2400000)
4 3 TABLE ACCESS (FULL) OF 'TABLENAME' (Cost=552 Card=200000 Bytes=2400000)
SQL> set autot off
SQL>
SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS(user,'TABLENAME',METHOD_OPT => 'FOR COLUMNS SIZE 250 columna')
PL/SQL procedure successfully completed.
Elapsed: 00:00:09.08
SQL>
SQL> set autotrace on explain
SQL> SELECT * FROM
2 (SELECT * FROM tablename WHERE columnA= 'ABC' ORDER BY TIME DESC)
3 WHERE rownum <= 10
4 /
TIME COL
17/09/06 ABC
12/09/06 ABC
08/09/06 ABC
07/09/06 ABC
25/08/06 ABC
22/08/06 ABC
13/08/06 ABC
08/07/06 ABC
14/06/06 ABC
01/05/06 ABC
10 rows selected.
Elapsed: 00:00:01.03
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=1434 Card=10 Bytes=120)
1 0 COUNT (STOPKEY)
2 1 VIEW (Cost=1434 Card=110806 Bytes=1329672)
3 2 SORT (ORDER BY STOPKEY) (Cost=1434 Card=110806 Bytes=1329672)
4 3 TABLE ACCESS (FULL) OF 'TABLENAME' (Cost=552 Card=110806 Bytes=1329672)
SQL>
SQL> SELECT * FROM
2 (SELECT * FROM tablename WHERE columnA= 'MNO' ORDER BY TIME DESC)
3 WHERE rownum <= 10
4 /
TIME COL
20/09/06 MNO
19/09/06 MNO
16/09/06 MNO
14/09/06 MNO
13/09/06 MNO
10/09/06 MNO
06/09/06 MNO
05/09/06 MNO
03/09/06 MNO
02/09/06 MNO
10 rows selected.
Elapsed: 00:00:02.05
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=6219 Card=10 Bytes=120)
1 0 COUNT (STOPKEY)
2 1 VIEW (Cost=6219 Card=555198 Bytes=6662376)
3 2 SORT (ORDER BY STOPKEY) (Cost=6219 Card=555198 Bytes=6662376)
4 3 TABLE ACCESS (FULL) OF 'TABLENAME' (Cost=552 Card=555198 Bytes=6662376)
SQL>
SQL> SELECT * FROM
2 (SELECT * FROM tablename WHERE columnA= 'STU' ORDER BY TIME DESC)
3 WHERE rownum <= 10
4 /
no rows selected
Elapsed: 00:00:00.00
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=6 Card=1 Bytes=12)
1 0 COUNT (STOPKEY)
2 1 VIEW (Cost=6 Card=1 Bytes=12)
3 2 SORT (ORDER BY STOPKEY) (Cost=6 Card=1 Bytes=12)
4 3 TABLE ACCESS (BY INDEX ROWID) OF 'TABLENAME' (Cost=5 Card=1 Bytes=12)
5 4 INDEX (RANGE SCAN) OF 'I2' (NON-UNIQUE) (Cost=4 Card=1)
SQL> Nicolas. -
No rows returned in GC Reports
Hi all,
I created my own report with the body as the following:
Table from SQL:
select * from sys.aud$ where to_char(ntimestamp#, 'DD-MON-YYYY')='18-NOV-2008'
I granted select on sys.aud$ to SYSMAN and MGMT_VIEW users in my TEST database.
When I am trying to run the report, it returns the empty table saying: "No rows returned", while there a lot of records:
17:13:17 db_manager@test> select count(*) from sys.aud$;
COUNT(*)
559859
Elapsed: 00:00:00.10
17:13:26 db_manager@test>
Does anybody know what I am missing here?
Thanks a lot in advance!
M.Hi, DBMS Direct.
thank you for writing to me.
could you please suggest how to check and to make sure that it queries the correct DB?
When I click on Edit button, In General tab in Targets I check the second radio button: Use the specified target and then i click on a flashlight and pick my DB. Whatever database I pick, the result is the same: no rows selected... Smells like it queries itself (repository)...
Please, advise, Im fighting for about two weeks now..
Thanks in advance,
M. -
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,
YonNo.
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.
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