Guidance on use of "COUNT() OVER () 5" in a select query.

Hello Friends,
I was reading one article, in which one table was created for demo. Following was the statements for there.
CREATE TABLE source_table
NOLOGGING
AS
SELECT ROWNUM AS object_id
, object_name
, object_type
FROM all_objects;
INSERT /*+ APPEND */ INTO source_table
SELECT ROWNUM (COUNT(*) OVER () * 5)+ AS object_id
, LOWER(object_name) AS object_name
, SUBSTR(object_type,1,1) AS object_type
FROM all_objects;
INSERT /*+ APPEND */ INTO source_table
SELECT ROWNUM (COUNT(*) OVER() * 10)+ AS object_id
, INITCAP(object_name) AS object_name
, SUBSTR(object_type,-1) AS object_type
FROM all_objects;
Can anyone please tell me the purpose of *"ROWNUM + (COUNT(*) OVER () * 5)"* in above 2 insert statements, or suggest me some document on that.
I don't know about its usage, and want to learn that..
Regards,
Dipali..

The insert statements that you have listed are using Oracle Analytic Functions. Some examples of these functions can be found here: [Oracle Analytic Functions|http://www.psoug.org/reference/analytic_functions.html|Oracle Analytic Functions]
Effectively what that says is the following:
1. "COUNT(*) OVER ()" = return the number of rows in the entire result set
2. Multiply that by 5 (or 10 depending on the insert)
3. Add the current ROWNUM value to it.
This can be shown with a simple example:
SQL> edit
Wrote file sqlplus_buffer.sql
1 SELECT *
2 FROM
3 (
4     SELECT ROWNUM r,
5             (COUNT(*) OVER ()) AS ANALYTIC_COUNT,
6             5,
7             ROWNUM + (COUNT(*) OVER () * 5) AS RESULT
8     FROM all_objects
9 )
10* WHERE r <= 10
SQL> /
         R ANALYTIC_COUNT          5     RESULT
         1          14795          5      73976
         2          14795          5      73977
         3          14795          5      73978
         4          14795          5      73979
         5          14795          5      73980
         6          14795          5      73981
         7          14795          5      73982
         8          14795          5      73983
         9          14795          5      73984
        10          14795          5      73985
10 rows selected.
SQL> SELECT COUNT(*) from all_objects;
COUNT(*)
     14795Hope this helps!
Note the the statements you provided will not actually execute because of the extra "+" signs on either side. I have removed them.

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10      select 2 mka_mktr_no, 'D' rat_freq_cd from dual union all
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Hi all,
i have a query wich is ran under 2 seconds when ecexuted in SQL (TOAD),
when i use this query in an interactive report then it takes minutes.
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Marco1975 wrote:
Hi all,
i have a query wich is ran under 2 seconds when ecexuted in SQL (TOAD), I doubt that.
I think your query returns many rows. Did you see all the rows in Toad in 2 secs?
If the answer is NO then the query is not finished after 2 secs. It just showed you the first few rows.
Almost every tool including apex does the same.
However if you want to know how many rows are returned then there is no way around doing the whole select until the last row.
Then the result can be shown.
APEX or a developer might use something like the analytic function "count(*) over ()" to get this result already on the first row. The database still needs to fetch all the rows. Howeverthe result set is not transported over the network to the client, which might also save a lot of time compared to not doing it on the database level.

Need help using count over function

I have the following query
Select student_id, OM, TM, TP, count(rownum) over (order by OM desc) PS from
(select
er.student_id, sum(er.obtained_marks) OM, sum(ds.max_marks) TM,
to_char(sum(er.obtained_marks)/sum(ds.max_marks)*100,'990.00') TP
from
tbl_exam_results er, tbl_date_sheet ds
where
ds.date_sheet_id = er.date_sheet_id and ds.class_id = 77 and ds.exam_id = 3 and ds.session_id = 1 group by er.student_id
results in
<div style="width: 889px"><div class="fielddata"><div>
<div>STUDENT_ID OM TM TP PS
1825 291 300 97.00 1
3717 290 300 96.67 2
2122 289 300 96.33 3
3396 287 300 95.67{color:#ff6600} *5 <--*{color}
4554 287 300 95.67{color:#ff6600} *5 <--*{color}
1847 281 300 93.67 6
1789 279 300 93.00 7
5254 277 300 92.33 8
1836 258 300 86.00 9
4867 250 260 96.15 10
1786 249 300 83.00 11
4659 245 300 81.67 12
1835 241 300 80.33 *{color:#ff6600}15 <--{color}*
1172 241 270 89.26*{color:#ff6600} 15 <--{color}*
3696 241 300 80.33 *{color:#ff6600}15 <--{color}*
3865 234 300 78.00 16
5912 215 300 71.67 17
5913 204 300 68.00 *{color:#ff6600}19 <--{color}*
3591 204 300 68.00 *{color:#ff6600}19 <--{color}*
1830 184 250 73.60 20
</div>
</div>
</div>
</div>
<div style="width: 889px"><div class="fielddata"><div>
But I want as following
<div>STUDENT_ID OM TM TP PS
1825 291 300 97.00 1
3717 290 300 96.67 2
2122 289 300 96.33 3
3396 287 300 95.67 *{color:#ff6600}4 <={color}*
4554 287 300 95.67 *{color:#ff6600}4 <={color}*
1847 281 300 93.67 {color:#ff6600}5 the following entry{color}
1789 279 300 93.00 6
5254 277 300 92.33 7
1836 258 300 86.00 8
4867 250 260 96.15 9
1786 249 300 83.00 10
4659 245 300 81.67 11
1835 241 300 80.33 {color:#ff6600}*12 <=*{color}
1172 241 270 89.26{color:#ff6600} *12 <=*{color}
3696 241 300 80.33 {color:#ff6600}*12 <=*{color}
3865 234 300 78.00{color:#ff6600} 13 the following entry{color}
5912 215 300 71.67 14
5913 204 300 68.00 *{color:#ff6600}15<={color}*
3591 204 300 68.00 *{color:#ff6600}15 <={color}*
1830 184 250 73.60 {color:#ff6600}16{color} {color:#ff6600}the following entry{color}
</div>
Thanks in advance for any help
</div>
</div>
</div>
<div style="width: 889px"></div>
Edited by: sabir786 on Jan 14, 2009 4:13 AM
Edited by: sabir786 on Jan 14, 2009 4:17 AM

Since I do not understand at all what you are trying to do, I cannot correct your query, but I can explain the results.
The analytic function is doing a running count of the number of records that have been outout so far. With no duplicates, this is somewhat clearer.
SQL> WITH t AS (SELECT 1 om FROM dual UNION ALL
2             SELECT 2 FROM dual UNION ALL
3             SELECT 3 FROM dual UNION ALL
4             SELECT 4 FROM dual UNION ALL
5             SELECT 5 FROM dual)
6 SELECT om, COUNT(rownum) OVER (ORDER BY om) ps
7 FROM t;
        OM         PS
         1          1
         2          2
         3          3
         4          4
         5          5However, when you have duplicates, both duplicate values get the running count from the last of the duplicates (i.e. the highest running count). Here, I have duplicated 4 and see what I get:
SQL> WITH t AS (SELECT 1 om FROM dual UNION ALL
2             SELECT 2 FROM dual UNION ALL
3             SELECT 3 FROM dual UNION ALL
4             SELECT 4 FROM dual UNION ALL
5             SELECT 4 FROM dual UNION ALL
6             SELECT 5 FROM dual)
7 SELECT om, COUNT(rownum) OVER (ORDER BY om) ps
8 FROM t;
        OM         PS
         1          1
         2          2
         3          3
         4          5
         4          5
         5          6The "second" 4 record had a running count of 5 (i.e. it was the fifth record output), so both 4's get the same count. Changing the order by to descending shows the same effect, it just changes the running count:
SQL> WITH t AS (SELECT 1 om FROM dual UNION ALL
2             SELECT 2 FROM dual UNION ALL
3             SELECT 3 FROM dual UNION ALL
4             SELECT 4 FROM dual UNION ALL
5             SELECT 4 FROM dual UNION ALL
6             SELECT 5 FROM dual)
7 SELECT om, COUNT(rownum) OVER (ORDER BY om DESC) ps
8 FROM t;
        OM         PS
         5          1
         4          3
         4          3
         3          4
         2          5
         1          6John

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I'm Using Sql Server Studio 2014
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AutoId Assembly_No [Rank]
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Hi, i was looking for some help in regards to understanding the general rule of using the count function. I am trying to build my knowledge of the different functions in order for me to have a better understanding so that I am writing my sql queries in the right way.
What i was looking to find out was trying to understand the count function. As i understand I can apply the following in order to give me a count of a particular set of data.
select number, count(*) AS no_count
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Solomon, thanks for your help. Apologies if i have not explained my question properly. The problem is that I haven't created the tables and have wrote my sample data and i am then trying to work out solutions before attempting to create the tables etc, which is probably where I am going wrong.
The job_ids can be repeated, first job_count should give me total job counts belonging to each job_id.
For example in your first dataset you have a job count for all jobs i.e. manager has 3 records with 1 job_count. So I would then like a column to give me a total count of job_count for each criteria i.e. manager had 3 total jobs. I have tried to breakdown the dataset you have shown alongwith the extras I am trying to add, to hopefully explain what I am looking for.
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MANAGER                    1                    3                                   0
PRESIDENT                  1                    1                                   1
CLERK                         1                    4                                   0
SALESMAN                  4                    4                                   0
ANALYST                    2                    2                                   0
MANAGER                   1                    3                                   0
MANAGER                   1                    3                                   0
CLERK                        1                    4                                   0
CLERK                        2                    4                                   0
[/CODE]
So this tells from all jobs which job was dealt with first time so in this case it would be the president, the rest of the jobs were repeated.
The total_job_count would be written like:select job, count(*) as TOTAL_JOB_COUNT
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Sorry for the inconvenience, and really appreciate your help and time.
Thanks
Apologies, not sure how to write the resultset as added but appears all over the place.
Edited by: 973436 on 17-Dec-2012 04:06

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Counter over flow reading

What is the utilization of counter over flow reading and annual estimate in counters? Is there any report or any application where it helps us in tracking?
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Edited by: V M on Jun 1, 2008 9:35 AM

hi
counter overflow reading is used wherein your counter reading overflows
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Hi,
I need my C++ program to read time (number of elapsed ticks) using the counter on PCI-6229. I had this written and working for the non-MX driver, and now I need to re-write it for NI-DAQmx.
Here are the steps that I want to accomplish:
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Hi Peter,
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Guidance on use of "COUNT(*) OVER () * 5" in a select query.

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Guidance on use of "COUNT() OVER () 5" in a select query.