and i want display the product that sells best in every store. I try to group by multiple columns counting how many times each product was sold in every store, but don't know how to select the one which was best sold (maximal number of times)
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.
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 ?
I want to create a report by using one field and one text as columns name in layout but display the all the columns. I mention the 5 column names in query.how can I write function in summary column.
I am running a fairly busy Oracle 10gR2 DB, one of the tables has about 120 columns and this table receives on average 1500 insertions per second. The table is partitioned and the partitioning is based on the most important of the two timestamp columns. There are two timestamps, they hold different times.
Out of these 120 columns, about 15 need to be indexed. Out of the 15 two of them are timestamp, at least one of these two timestamp columns is always in the where clause the queries.
Now the challenge is, the queries we run can have any combination of the 13 other columns + one timestamp. In reality the queries never have more than 7 or 8 columns in the where clause but even if we had only 4 columns in the where clause we would still have the same problem.
So if I create one concatenated index for all these columns it will not be very efficient because after the 4th or 5th column the sorting would no longer be very useful and I believe the optimiser would simply not use the rest of the index. So queries that use the leading columns of the index in sequence work well, but if I need to query the 10th column the I have performance issues.
Now, if I create multiple single column indexes oracle will have to work a lot harder to maintain all these indexes and it will create performance issues (I have tried that). Besides, if I have multiple single column indexes the optimiser will do nested loops twice or three times and will hit only the first few columns of the where clause so I think it will kind of be the same as the long concatenated index.
What I am trying to do is exactly what the Bitmap index would do, it would be very good if I could use the AND condition that a Bitmap index uses. This way I could have N number of single column indexes which the optimiser could pick from and serve the query with exactly the ones it needs. But unfortunately using the Bitmap index here is not an option given the large amount of inserts that I get on this table.
I have been looking for alternatives, I have considered creating multiple shorter concatenated indexes but this still would not address the issue since many queries would still not be served properly and therefore would take a very long time to complete.
What I had in mind would be some sort of multidimensional index, I am not even sure if such thing exists. But essentially it would be some sort of index that could serve a query efficiently regardless of the fact that the where clause has the 1st, 3rd and last columns of the index.
So considering how widely used Oracle is and how many super large databases there are out there, this problem must be common.
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]
I have 8 columns. Some of them might be null.I want to display all 8 columns in my result. Not null columns will be first and null at the end.Here is a sample data :
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
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.
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.
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
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.
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"
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),
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';
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.
select T2.name,sum(T1.area) from (select * from country) T1,T2i wrote very simple just to show you the problem, bu i think here we should add "group by". but is there any way to avoid group by?because i don't want to group any thing!
