Using GROUP BY To Get Counts
Jan 22, 2008
how to logically connect two tables. Here is an example of what I'm trying to do:
HOSTS TABLE CPU TABLE
----------- ---------
ID HOST ID CPU
01 host1 01 proc01
02 host2 01 proc02
03 host3 02 proc01
02 proc02
02 proc03
02 proc04
03 proc01
Based on the above, I can see that 'host1' has 2 CPUs, 'host2' has 4 CPUs, and 'host3' has 1 CPU. What I'd like to do is create a query that would output:
HOST CPU
----------
host1 2
host2 4
host3 1
I'm looping through the hosts and passing the them into another query as bind variables. That's slow and cannot be the best way to do this. I'm aware that I need to using a GROUP BY HAVING COUNT, but that doesn't seem to be working. It tends to return the total count of all CPUs rather than CPUs per host.
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Jan 28, 2012
I have taken the export backup of a table using the following command
userid=system/manager@DBATEST
file=abc.dmp
log=abc.log
Tables=X.S_ORG_EXT_X
feedback=100000
buffer=10000000
[code]......
but on querying the table it shows the number of rows as
select count(*) from X.S_ORG_EXT_X;
COUNT(*)
----------
25656051
Explain why there is a mismatch in the count of the rows in the table.
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Nov 7, 2011
I have a UNION query having 3 parts, 1st gets date, 2nd data and 3rd displays the formatted data count :WHERE clause of 2nd and 3rd queries are same.
Problem is that I an getting different record counts when I select the overall count of records given by the whole UNION query and when I run to count the records given by each query individually.First count. Here I am selecting the overall count of records given by the query :
select count(1)
from (
SELECT SUBSTR ( '0'
|| TO_CHAR (SYSDATE, 'MM/DD/YYYY')
|| TO_CHAR (SYSDATE, 'HH:MI:SS')
|| LPAD (' ', 180)
[code]...
This count is : 1751525 Second count. Now when I run to count the records given by each query individually, here is the result
select count(1) a
from (
SELECT SUBSTR ( '0'|| TO_CHAR (SYSDATE, 'MM/DD/YYYY') || TO_CHAR (SYSDATE, 'HH:MI:SS')
|| LPAD (' ', 180)|| chr(13), 1, 200 ) dtl_record from dual
select count(1) b from (
SELECT '1'
[code]...
why there is difference of 1 (1751526 - 1751526) in the count results.
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Feb 10, 2013
Managed to confuse myself significantly. I essentially want to write a query to determine when two counts are the same using a subquery.
Eg:
R(x,y)
Select count(x)
from R
group by x;
Then I want to run another query to determine which x's have the same count value and output these corresponding x's.
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Apr 26, 2013
We have a partitioned transaction table in our Datawarehouse environment which has the following partition strategy
SCHEME=DATE-HASH
GRAIN=DAILY
SUBGRAIN=NONE
HASH=8
FROM=31/12/2011
We recently had to delete data from the table. This was a simple delete statement with a where clause and without taking into consideration any partition/subpartition clauses. Post committing the delete we have a count mismatch problem with two queries in particular
select count(0) count_without_parallel FROM TRANSACTION_TABLE t;
--THIS RETRIEVES *15774811* ROWS
select /* parallel(t,default) */count(0) count_with_parallel FROM TRANSACTION_TABLE t+
--THIS RETRIEVES *15777617* ROWS WHICH IS THE ACTUAL EXPECTED COUNT.
I also ran the following just to summarize
select (select count_with_parallel from (
select /* parallel(t,default) */count(0) count_with_parallel FROM TRANSACTION_TABLE t))+
-
+(select count_without_parallel from (+
select count(0) count_without_parallel FROM TRANSACTION_TABLE t)) as false_difference
from dual;
The difference in *2806* rows as expected.To re-affirm my counts I ran
select /*+ parallel(t,default) */
'count_on_t',count(*) from TRANSACTION_TABLE t
group by 'count_on_t'
order by 1;
--THIS RETRIEVES *15777617* ROWS
Removing the parallel hint reverts back to the lesser count. Not sure what is wrong but something prevents the query from parsing the whole table and/or partitions and subpartitions.
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Aug 9, 2010
I am trying to get a row count(*) for all the tables in my schema. The NUM_ROWS column in DBA_TABLES is not appropriate in this case because they are as good as the last analyze. So I need to get real time counts.
I tried the following code but I can't seem to catch my error.
DECLARE
l_sql varchar2(150);
cursor tablelist is
select table_name from dba_tables where owner = 'ME';
[Code]....
My expected results are :
TABLE_NAME ROW_COUNT
---------- ----------
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Sep 26, 2012
User table
id | name
----------
2 | Harry
3 | Mary
Course_User table
summer_course_completed | winter_course_completed | user_id | attendance
------------------------------------------------------------------------
y | n | 2 | 20
y | n | 2 | 40
y | y | 2 | 30
n | n | 3 | 20
n | y | 3 | 60
I wish to list each student's name with the number of summer courses he has completed and the number of winter courses he has completed. I am trying this :
select u.name, count(*)
from user u, course_user cu
where u.id=cu.user_id and cu.summer_course_completed = 'y'
group by u.id;
but I can get only the number of summer courses OR the number of winter courses that each student has completed, but never both simultaneously, through a single query. Is there a way to do that ?
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Dec 22, 2011
I have made a simple form in which user will be entering his username and relevant password to get authorised. My issue is , if the user is entering wrong password for 3 times then both fields should get disabled. I did the form until the point where it checks wether the user is authorised or not. But how to give count on failure of passwords.
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Jun 30, 2011
I have got another curly one with regard to Sql Loader. My original issue via [message #513696] was resolved. In summary, SQL Loader opens a comma delimited csv file and it is able to successfully populate the appropriate Oracle table. However, during the run to process each unique csv file, SQL Loader produces a both a .log file (indicating what transpired during the load) and a .bad file of the records from the csv file that where rejected by SQL Loader.
the users have requested that "is it possible to update a separate table of the summary results of what went wrong and what was right?" It just so happens that the csv file contains some summary records (rows) with processing audit infor...as the following .bad file wrote out....
___________________________
ModuleID,ModuleSN,Lat,Lon,GMT Time,Tag Count,GMT Date,Client,Farm,Field,Variety,Machine
No Module ID ,No SN ,-30.178958,149.63844,9:55:58,0,21/04/2011,101,Widgen ,9,71BRF ,5987
3500B9880611170260179BFB,10202094587,-30.199379,149.661333,7:10:35,2,22/04/2011,101,Widgen ,30,71BRF ,5987
,,,,,,,,,,,
Total Modules,1602,,,,,,,,,,
Mis-reads,1,,,,,,,,,,
Mis-read %,0.06,,,,,,,,,,
1. The first record (starting in the 1st postion is "ModuleID") is a heading record in the csv file and can be disregarded.
2. The secord record (starting in the 1st postion is "No Module ID") is an error record in the csv file and can be disregarded.
3. The third record (starting in the 1st postion 3500B9880611170260179BFB, ) is a valid record, however, is was rejected as it is a duplicate of a preceeding record ...and the log indicates ...
Record 124: Rejected - Error on table PTLIVE.MODULE_CSV_LOADS.
ORA-00001: unique constraint (PTLIVE.MODULE_SERIAL_NUMBER_UK) violated
4. The fourth record (starting in the 1st postion is ,,,,,,,,,,,
) is a blank record in the csv file and can be disregarded.
5. The fifth record (starting in the 1st postion is "Total Modules" has a value of 1602 which I need to capture to write into a separate table.
6. The sixth record (starting in the 1st postion is "Mis-reads" ) has a value of 1 which I need to capture to write into a separate table.
7. The last record in the csv file and can be disregarded.
The summary Oracle table is
CREATE TABLE PTLIVE.SUBMODULES_SUMMARY
( IMPORT_CSV_FILE_NAME VARCHAR2(256 ),
TOTAL_SUBMODULES_LOADED NUMBER (5),
TOTAL_SUBMODULES_MIS_READ NUMVER (5),
DATEIMPORTED DATE default SYSDATE
)
Now I would like to trap the value 1602 and load that into the Oracle column TOTAL_SUBMODULES_LOADED and the value 1 and load this into TOTAL_SUBMODULES_MIS_READ.
The name of the csv file is known and I can (as the previous [message #513696] resolved) simply use a SQL Loader control file command > IMPORT_ CSV_FILE_NAME CONSTANT "Batch_2011Jun29_TEST.csv".
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Sep 25, 2012
I have a table
TAB1 with data
no name
1 abc
2 abc
3 xyz
4 xyz
5 cvb
now I would like to create a form with name counts as
abc 2
xyz 2
cvb 1
I would like to create a datablock to display all the unique names, not sure where I should be writing the query to display unique names. I would like to create a textitem box to display the counts when the form is compiled, but not sure which trigger to use to write the query.
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May 3, 2010
We had a new outsourcer who completed migration of 1 of our system running under Oracle10g-Solaris 10. We created an inventory script that will list all objects counts of SYS, SYSTEM and ORACLE and all other schemas. This script will be ran before (old server) and after migration (to new server). After migration to the new & bigger server, we noticed from the output of the inventory script for SYS/SYSTEM object counts had been reduced compared from the original/actual value (from the old server). Our outsourcer said that this is not an issue since SYS/SYSTEM objects are not transactional and cannot be controlled.
As we will conform that the migration was completed successfully by our new outsourcer.
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Nov 1, 2013
I'm trying to group sets of data based on time separations between records and then count how many records are in each group.
In the example below, I want to return the count for each group of data, so Group 1=5, Group 2=5 and Group 3=5
SELECT AREA_ID AS "AREA ID",
LOC_ID AS "LOCATION ID",
TEST_DATE AS "DATE",
TEST_TIME AS "TIME"
FROM MON_TEST_MASTER
WHERE AREA_ID =89
AND LOC_ID ='3015'
AND TEST_DATE ='10/19/1994';
[code]....
Group 1 = 8:00:22 to 8:41:22
Group 2 = 11:35:47 to 11:35:47
Group 3 = 15:13:46 to 15:13:46
Keep in mind the times will always change, and sometime go over the one hour mark, but no group will have more then a one hour separation between records.
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Jun 23, 2011
I read that rownum is applied after the selection is made and before "order by". So, in order to get the sum of salaries for all employees in all departments with a row number starting from 1, i wrote :
select ROWNUM,department_id,sum(salary) from employees group by department_id
If i remove rownum, it gives the correct output. Why can't rownum be used here ?
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May 17, 2011
Refer to the txt file to create table and insert data.
I executed the following query-
SELECT priority, detail, COUNT(1) FROM TEST GROUP BY priority, detail
and got the following result-
PRIORITYDETAIL COUNT(1)
StandardPatch 27
StandardInitial TSS 1
StandardInitial development 10
StandardProduction deployment5
High PriorPatch 1
Now I want that Initial TSS and Initial development should be combined as Initial together and I should get the result as follows:
PRIORITYDETAIL COUNT(1)
StandardPatch 27
StandardInitial 11
StandardProduction deployment5
High PriorPatch 1
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May 9, 2011
Is there any way to add one disk group space to another disk group. Because One of my disk group is full i want to add space in to that group.
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Mar 23, 2013
I'm using this code, and it performs fine, but I'm wondering if there is a more elegant way to do it--maybe with "ROLLBACK". Basically (as you can see) I need to get a normal count for each group but also for each group take a percentage of the total count (so all groups pct adds up to 100 (oh yeah, don't test for zero below, but just a test... )
select
c.Event,
c.code,
count(1) as calls,
total.total_count,
count(1) / total.total_count * 100 as pct_of_total
from
table1 c
[Code]....
[Edit MC: add code tags, do it yourself next time]
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Oct 10, 2011
CREATE TABLE TEMP_GP_SEQ
(
COL1 NUMBER,
COL2 NUMBER,
COL3 NUMBER,
COL4 NUMBER,
COL5 NUMBER,
COL6 NUMBER,
COL7 CHAR (25)
);
[Code]...
I need to update the TEMP_GP_SEQ table and on the COLUMN COL7 based on the grouping range mentioned above using the sequence created. But the sequence should not be incremented for each and every record, it should be incremented only for change of groups. For example
SELECT *
FROM TEMP_GP_SEQ;
COL1 COL2 COL3 COL4 COL5 COL6 COL7
110100
110101
12101001
[Code]...
After update it should look like
SELECT *
FROM TEMP_GP_SEQ;
COL1 COL2 COL3 COL4 COL5 COL6 COL7
110100
110101
12101001M2
[Code]...
Actually the group by fetched two rows with a total record count of 4 (2 records in both the rows). SO the COL7 is updated for these four rows with M as a prefixed word and the number followed after M is from the sequence. Here the number is changing (sequence is incrementing) only when there is a change in grouping criteria and it remains the same throughout a group.
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Jun 19, 2013
Give me some examples of creating grouped in VPD .
Group policy example for
1) Grouped policy on same table for different columns
2) Grouped policy on two different table for different columns
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Sep 5, 2012
I have a query that extracts the row with a max(record_date) within a group.
select ssn, fund, type_indicator, annuitant, cur_year, record_date, guarantee
from LC_MORTALITY
where (ssn, fund, type_indicator, annuitant, cur_year, record_date) in
(select ssn, fund, type_indicator, annuitant, cur_year, max(record_date)
from LC_MORTALITY
group by ssn, fund, type_indicator, annuitant, cur_year);
the table has index that matches the group by clause exactly.
create index IDX_LC_MORTALITY_sftayd on LC_MORTALITY
(SSN,
FUND,
TYPE_INDICATOR,
ANNUITANT,
cur_year,
record_date
However, the plan ignores the index
---------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
---------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1963K| 241M| | 1375K (4)| 05:21:04 |
|* 1 | HASH JOIN RIGHT SEMI| | 1963K| 241M| 9701M| 1375K (4)| 05:21:04 |
| 2 | VIEW | VW_NSO_1 | 145M| 8038M| | 241K (12)| 00:56:22 |
| 3 | HASH GROUP BY | | 145M| 8038M| | 241K (12)| 00:56:22 |
| 4 | TABLE ACCESS FULL| LC_MORTALITY | 145M| 8038M| | 219K (3)| 00:51:13 |
| 5 | TABLE ACCESS FULL | LC_MORTALITY | 145M| 9840M| | 222K (5)| 00:51:49 |
---------------------------------------------------------------------------------------------
[code]...
It uses the index but still shows "table access full" in one place. Why is there still a full access?Can I do anything to optimize further?
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Sep 8, 2011
My requirement is Data from a TableA has to be provided as an overall view
TABLEA
ID ENTITY REQ_FLG PAR_FLG EXT_FLG
CONV_1 ACCNT Y Y Y
CONV_1 PROD Y Y N
CONV_1 ADDR Y N N
CONV_2 DID Y N N
CONV_2 ORDER Y N N
Required to show the data in report as
ID Expand View_Report Populate ENTITY QRY_STATUS
CONV_1 Expand Report Populate
ACCNT Y Y Y
PROD Y Y Y
ADDR Y N N
CONV_2 Expand Report Populate
DID Y N N
ORDER Y N N
Where "Expand", "Report", "Populate" are provided as Hard coded values in query.
Sample Query.
SELECT ID
,'Expand' AS EXPAND
,'Report' AS VIEW_REPORT
, 'Populate / Reset' AS POP
, DECODE(MN_TBL.ENTITY,NULL,NULL,ENTITY) AS ENTITY
, REQ_FLG || ' ' || PAR_FLG || ' ' || EXT_FLG AS QRY_STATUS
FROM TABLEA
GROUP BY GROUPING SETS
((ID), (ENTITY, REQ_FLG , PAR_FLG , EXT_FLG ))
ORDER BY CONVERSION_ID, ENTITY
Above query works fine, where single ID is present
ID Expand View_Report Populate ENTITY QRY_STATUS
CONV_1 Expand Report Populate
ACCNT Y Y Y
PROD Y Y Y
ADDR Y N N
But when more than one ID is present the entire thing collapses
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Jun 26, 2013
My weekly reports should start from Thursday and it ends on Wednesday . I need to aggregate data from Thursday to Wednesday. At the end of every month i generate report for the last 4 weeks.
I couldn't find a way to group by correctly. When I make group by trunc(fragment_date,'day')+2 and check the data it aggregates data from Monday to Sunday.
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Oct 27, 2011
SELECT COUNT(c.country_id)
FROM countries c,
employees e,
locations l,
departments d
[Code]....
I really dont know when and where to use the group by statement from the query above when I added C.country name before the word from I'm always getting this error "ORA-00979: not a GROUP BY expression"
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Mar 31, 2011
This time, I am going to provide the DML statements.
I have a simple table with 3 fields in it.I want to group by ACCT_NUMBER and sum of BALANCE field. But I want to get the description of the first row in a group.
the statements below. Here there are two groups of records 2001 and 2002. My sql(which I am working on) should return the following :
2001 EMPL TRAINING-MIS 20
2002 OTHER PROF SERV-HR 40
The following query will group by ACCT_NUMBER and sum of the BALANCE field. But how can I get the DESCRIPTION?
SELECT ACCT_NUMBER, SUM(BALANCE)
FROM TEST
GROUP BY ACCT_NUMBER
CREATE TABLE "TEST"
("ACCT_NUMBER" VARCHAR2(20 BYTE),
"DESCRIPTION" VARCHAR2(20 BYTE),
[code]...
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Jul 3, 2011
I am having trouble selecting the row that has max(pay_period) of 13. Here is some test data.
CREATE TABLE TESTME
(
SSN VARCHAR2(11 BYTE),
PAY_PERIOD VARCHAR2(3 BYTE),
PAY_YEAR NUMBER,
KRONOS_ID VARCHAR2(6 BYTE),
LAST_NAME VARCHAR2(15 BYTE),
FIRST_NAME VARCHAR2(14 BYTE),
ADJ_SALARY NUMBER
)
[code]....
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Mar 7, 2013
I need suing group by for getting count.I have a table with columns below
SYS_AUDIT_IDSYS_AUDIT_PROG_IDPROG_FINDING_ID_COUNT
178921652
178921641
178921631
179321521
179321511
179321501
179321491
179321461
I want to count number of SYS_AUDIT_PROG_ID for each audit and count of PROG_FINDING_ID_COUNT
I want to get
1789 3 4
I tried this query but this is not working
[code]select sys_audit_id ,count (sys_audit_prog_id), count(prog_finding_id_count) from
my_table sub
group by sys_audit_id [/code]
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Feb 18, 2011
I have a table OS_CURRENTSTEP , and OS_WFENTRY
CREATE TABLE OS_CURRENTSTEP
(
ID NUMBER,
ENTRY_ID NUMBER NOT NULL,
STEP_ID INTEGER NOT NULL,
ACTION_ID INTEGER,
OWNER VARCHAR2(20 BYTE),
START_DATE DATE,
[Code]...
I need count of step_id from os_currentstep wh
here is the query
select count(step_id), step_id from os_currentstep where owner='Marty' group by step_id
this gives me the count I also need the name associated with this step_id from table OS_WFENTRY
, I cannot query name from step_id ,
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Jul 2, 2010
count the no: of emp working under each manager? and instead of manager number display the manager name
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Nov 5, 2011
I am new to PL/SQL, could you pls let me know how to solve this requirement using PL SQL
C-A | C-B
A123 | -1
B334 | 4
B567 | 2
B333 | -1
T777 | 2
Y774 | 3
T879 | 4
T654 | 3
T474 | 0
Y432 | -1
I need the output like this
C-1|C-2|C-3|C-4
3 |7 |3/10|7/10
Column-1 (Count of rows where Column-B = -1)
Column-2 (Count of rows where Column-B in(0,1,2,3,4)
Column-3 (Column-1/Total rows)
Column-4 (Column-2/Total rows)
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Sep 14, 2012
Here is the scenario with examples. Big table 333 to 500 million rows in the table. Statistics are gathered. Histograms are there. Index is not being used though. Why?
CREATE TABLE "XXFOCUS"."some_huge_data_table"
( "ORG_ID" NUMBER NOT NULL ENABLE,
"PARTNERID" VARCHAR2(30) NOT NULL ENABLE,
"EDI_END_DATE" DATE NOT NULL ENABLE,
"CUSTOMER_ITEM_NUMBER" VARCHAR2(50) NOT NULL ENABLE,
"STORE_NUMBER" VARCHAR2(10) NOT NULL ENABLE,
"EDI_START_DATE" DATE,
[Code]...
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> SELECT num_rows FROM user_tables s WHERE s.table_name = 'some_huge_data_table';
NUM_ROWS
----------
333338434
SQL> SELECT MAX(edi_end_date)
2 FROM some_huge_data_table p
3 WHERE p.org_id = some_number
4 AND p.partnerid = 'some_string';
MAX(EDI_E
---------
13-MAY-12
Elapsed: 00:00:00.00
SQL> explain plan for
2 SELECT MAX(edi_end_date)
3 FROM some_huge_data_table p
4 WHERE p.org_id = some_number
5 AND p.partnerid = 'some_string';
Explained.
SQL> /
PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
Plan hash value: 2104157595
--------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 22 | 4 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 22 | | |
| 2 | FIRST ROW | | 1 | 22 | 4 (0)| 00:00:01 |
|* 3 | INDEX RANGE SCAN (MIN/MAX)| some_huge_data_table_PK | 1 | 22 | 4 (0)| 00:00:01 |
--------------------------------------------------------------------------------------------
SQL> explain plan for
2 SELECT MAX(edi_end_date),
3 org_id,
4 partnerid
5 FROM some_huge_data_table
6 GROUP BY org_id,
7 partnerid;
Explained.
PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
Plan hash value: 3950336305
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 44 | 1605K (1)| 05:21:03 |
| 1 | HASH GROUP BY | | 2 | 44 | 1605K (1)| 05:21:03 |
| 2 | TABLE ACCESS FULL| some_huge_data_table | 333M| 6993M| 1592K (1)| 05:18:33 |
-------------------------------------------------------------------------------
Why wouldn't it use the index in the group by? If I write a loop to query for different partnerid (there are only three), the whole things takes less than a second.
btw, I gave the index hint too. Didn't work. Version mentioned in the example.
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Sep 14, 2012
below is the create and insert script.
create table sal_group (g_id number(10),sal_rand number(20));
/
INSERT INTO sal_group values(1,5000)
/
INSERT INTO sal_group values(1,2000)
/
INSERT INTO sal_group values(1,4000)
[code]...
/I have tried
SELECT g_id,sal_rand,
case when row_number() over (order by g_id) = count(*) over () then 'yes' else null end as row_check
FROM sal_group output:
G_ID SAL_RAND ROW_CHECK
1 4000
1 2000
[code]....
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