Finding Correlation Using Derived Columns?
May 13, 2007
I want to use the aggregate CORR_S function which take two numerical columns and output the correlation between them. Assuming I have the table:
Employee(name, gender, salary) where I want to create two derived columns, how would I do it?
Like,
-------------------
SELECT CORR_S(
SELECT salary
FROM employees
WHERE salary < 10000,
SELECT salary
FROM employees
WHERE salary > 10000
) as correlation
FROM employees
---------------------
It will find the correlation between salary's less than $10,000 in one column and salary's more than $10,000 in another column. Of course, I get an error when running the query. It's no problem if I use CORR_S(salary, salary) but I want to use derived columns, is it possible? Or, will I need to create a new table view with two new columns CORR_S(lowSalary, highSalary)?
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Jan 18, 2012
The challenge I am currently facing is finding the maximum value of two independent columns of a single table. Here is the structure of the table:
[FiscalYear] [AccountingPeriod]
------------ ------------------
[2012] ------------- [2]
[2011] ------------- [12]
[2012] ------------- [1]
What I need to be able to do is to:
1) Determine the maximum value present in column FiscalYear, and then the maximum value available for this FiscalYear under the column Accounting Period.
I can do this fairly easy on Microsoft SQL server, but so far was not able to do this easily on Oracle database. My other observation is that using the MAX function on Oracle is very slow (even with thse fields being indexed). Is it possible to run this query on Oracle with only one pass through the table where the returned result will show 2012 for FiscalYear, and 2 for Accounting Period?
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Nov 25, 2011
if there is any inbuilt function or way to find a row in the table that is having value for maximum number of columns.
For example, the table A has 5 columns
(c1,c2,c3,c4,c5) and it has 3 records(r1,r2,r3)
and
r1 has values only for c1,c2
r2 has values only for c1,c2,c3,c4
r3 has values only for c1
so I should get the result as "r3 has values for 4 columns & it is not having value for column c5".
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Apr 2, 2011
here is my query
SELECT CURRENTSTEP
FROM (SELECT ( WFENTRY.NAME
|| ','
|| CURRENTSTEP.STEP_ID
) AS CURRENTSTEP,
(CASE
WHEN WFENTRY.NAME IN
[Code]...
in this query I am concatenating tow columns , I use this query as a sub query in my other queries and filter the results with and CURRENTSTEP = ?
here is how I use it
select
sys_audit_id
from
( SELECT
*
FROM
(SELECT
F.FINDING_NUMBER,
[Code]....
I saw adding this as a subquery with the filter and CURRENTSTEP = ? is slowing my query very much , as this is a derived column i cannot add index then how to improve performance for this subquery ?
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Jul 31, 2013
I have a INSERT query which is happening with a SELECT query.
===================================================
INSERT INTO tbl_fact_effort_lvl_data ( ............... )
SELECT ria.report_id,report_status: :,
((SELECT lov_num_val
FROM tbl_reference_data
WHERE lov_type = 'FREQUENCY' ) * (SELECT SUM(pph_task)
FROM tbl_ri_process
WHERE report_id = ria.report_id )) TOT_YEARLY_PROD_HOURS ,TOT_YEARLY_PROD_HOURS * tf.fac_value TOT_FACT_DATA,location_id
FROM tbl_fact tf LEFT JOIN ......... ;
====================================================
So, here I want to use column alias TOT_YEARLY_PROD_HOURS as another column to derive another column value TOT_FACT_DATA.
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Jun 16, 2010
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.
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Apr 4, 2011
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.
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Jan 21, 2011
I have a two question.
Question 1:How to select all columns from table except those columns which i type in query
Question 2:How to select all columns from table where all columns are not null without type each column name which is in empty data
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Jun 19, 2013
I have the following query where i need to find the max value[code] with t as
( select 'L1' R_nm ,'Data' R_Data , 'Obj' R_Obj , 'Wd' r_prec , '2' val
from dual union all select 'L1' , 'Data', 'Obj' , 'No', '4'
from dualunion all select 'L2' , 'Data', 'Obj' , 'No', '4' from dual )
select t.*, max(val) over(partition by r_nm,r_data,r_obj) rk from t[/code]
My expected output should be
[code]
r_nm r_data r_obj r_prec val rkL1 Data Obj Wd 2 1L1 Data Obj No 4 2L2 Data Obj Yes 1 1
[/code]
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Dec 4, 2011
I'm not really sure why oracle is not finding my Foreing Key, I'm creating an easy set of table for a company and I'm declaring all Primary keys and foreing keys as necessary and this is my
CREATE TABLE Items
(ItemID NUMBER(5) NOT NULL,
Description VARCHAR2(30),
ListPrice NUMBER(9,2) NOT NULL,
QtyOnHand Number(5),
ReorderPoint NUMBER(3),
ReorderQty NUMBER(3),
OnBackOrder Number(3),
CONSTRAINT ItemsPK
[Code] ............
There's three sets of inserts the first two successfully inserts the data NO problem but when i try to insert the data on SupplierItems comes as:
ERROR at line 1:
ORA-02291: integrity constraint (jcarter.SUPPLIERITEMSFK2) violated - parent key not found
I looked on the forum and it appears this happens when someone is doing a Insert ALL but this is not my case..
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Oct 31, 2012
Select * from one:
ID SALARY
----------------------
10 1000
20 2000
30 3200
Select * from two:
ID SALARY
----------------------
10 1000
20 2000
40 4000
10 3000
20 4000
30 3000
When i try to find ID,MAX(SALARY) from these two tables, i am getting this output:
Select id,max(salary)
from
(select * from one
union
select * from two)
group by id
order by max(salary) desc;
OUTPUT:
ID MAX(SALARY)
--------------------------------------
20 4000
40 4000
30 3200
10 3000
I want OUTPUT to be like this:
ID MAX(SALARY)
--------------------------------------
20 4000
40 4000
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Jun 23, 2008
What i have is table with:
mission_id, mission_type_id, security_level and code_name.
What i have to do is get the 10 most recent missions and change their security level to the highest one in their mission_type_id but ONLY if code_name length is >7
So far I have this, the problem is that the oracle moans about the order and wants me to close the bracket before the order
sql
UPDATE missions m
SET m.security_level = (
SELECT max(m2.security_level)
FROM missions m2
WHERE m2.mission_type_id = m.mission_type_id
AND length(m2.code_name) > 7
)
WHERE m.mission_ID IN (
Select m3.mission_id
From missions m3
ORDER BY m3.mission_id desc)
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Dec 23, 2011
How can i come to know that which current alert log file is being used for database? Is their a command at database level to find out the current alert log file to which database is using ?
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Oct 4, 2007
Whats the command to show the name of the primary key in a table using oracle sql plus?
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Nov 3, 2008
I have read and used the AWR script (mentioned in the page Finding unused index for finding unused customised (Z) indexes in our SAP system using oracle 10.2.0.2 as the SAP database.
But this returns no rows. Is there any precondition? I want to know how much / many times the indexes are used...We are smelling that lot of unused index are there in the database.
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May 30, 2011
How to find the list of tables which has permission select only and tables which has both read and write access permission for a particular user.
I'm using ORACLE database.
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Nov 22, 2011
finding the difference between IN and EXIST.
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Feb 7, 2012
I want to track the session id that has been initiated by a particular job (I have job ids with me). Which dictionary views I can get this result.
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Nov 1, 2011
@test.sql
accept 1 num prompt 'enter begin value '
accept 2 num prompt 'enter end value '
Need to display all values between the above given inputs.
No tables involved.
Need SQL level solution in version 8i.
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May 20, 2010
i have table with name, count, flag with dublicate records
example
with swayam name , counts are 3, 4
with ramana name, counts are 5,5
with reddy name, counts are 1,2,3
i want to update the flag
if count are same then update one of record (flag='A') and other should be flag='R'
if count are different then update the max count (flag='A') and other should be reject remaing (flag='R'). use below quires
CREATE TABLE TEST_DUB ( NAME VARCHAR2(99), V_COUNT NUMBER, FLAG VARCHAR2(1));
Insert into TEST_DUB (NAME, V_COUNT)
Values
('SWAYAM', 3);
Insert into TEST_DUB
(NAME, V_COUNT)
Values
[Code]....
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Aug 1, 2012
I have a partitioned tables and local partitioned index on the same.
I want to know that a particular index partition belong to which table partition.
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Jan 12, 2012
Version : Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
I have a source which is of datatype RAW(1). Basic requirement is to convert it into binary, and then lookup the value of the 4th and 6th bit. Is this possible using simple SQL ?
Eg.
DataBinary
----- -------
EF1110 1111
From this binary output, i need to find the value of 4th and 5th bit.
So if the 4th bit is 1, I need to perform some operations if 0 then some other.
Create table test_hex_to_bin (col1 raw(1));
INSERT into test_hex_to_bin values ('99');
INSERT into test_hex_to_bin values ('EF');
INSERT into test_hex_to_bin values ('AB');
Basically the output should read as
Bit_number Value
----------------
4 1
5 0
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Sep 26, 2011
we can find the IP address in V$session table. Is it possible to find the mac address of user's computer?
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Feb 7, 2013
1. I have 6 data bases, one process is running slowly, how do you find which data base that process belongs to?
2. I have 6 data bases, only one data base we have ASM instance, how do you find which data base has ASM?
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Dec 14, 2010
I am reading Section 4-8 (page 42/216) in the Oracle Database 2-day Developer Guide from here:
[Code]....
It reads:
Suppose that you want to select every employee whose last name has a double vowel(two adjacent occurrences of the same vowel).
Example 4.9 shows how you can do this.
The regular expression ([AEIOU]) represents any vowel. The metacharacter 1 represents the first (and in this case, only) regular expression. The third function parameter, 'i', specifies that the match is case-insensitive.
Example 4.9 Selecting All Employees Whose Last Names Have Double Vowels
SELECT FIRST_NAME, LAST_NAME
FROM EMPLOYEES
WHERE REGEXP_LIKE(LAST_NAME, '([AEIOU])1', 'i');
Result is similar to:
FIRST_NAME LAST_NAME
-------------------- -------------------------
Harrison Bloom
Lex De Haan
Kevin Feeney
Ki Gee
Nancy Greenberg
Danielle Greene
Alexander Khoo
David Lee
8 rows selected.
I don't understand how [AEIOU])1 would find a double vowel(two adjacent occurrences of the same vowel).
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Sep 2, 2010
I am using oracle 10g, i want to know the cost of query. In the explain plan and by auto trace am able to get some query cost, but i dont know how to calculate the query cost.
How i will know the query is costly and take more time..? But i know about the hash table and nested tables in the explain plan.
Other than this how to calculate the query cost..?
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Mar 28, 2012
I tried this query .. but no luck / I know it has some errors
SQL> select invoice_num from ap_invoices_all where rownum < 10 and invoice_num in ('%1%','%2%');
no rows selected
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Jan 15, 2013
I have inserted through frontend which is ORACLE ADF and if i want to see those inserted data's in a table then how to check it when i dont know the table names and if there are large number of tables available.. Its I need a solution in this way as i know the values of fields so by giving values alone I want to fetch the table and column names as wherever this values are present...I am already aware about user_tab_columns and user_tables or all_tables .. So i want to try through fetching of tables or column names though values or data's as reference ...
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Jan 26, 2010
I have simple table:
code = CHAR(5) as primary key
name = VARCHAR2(bla blal ba)
There is one-block-form based on this table. Block's datasource type = table and datatarget type = pl/sql procedure
Table API, Module API - all generated, all valid and seems correct. Now.. I try to update "name" from form. As soon as I type in something in the field, I get message "Row no longer exists". When digging deeper it seems that problem raises from lock_prodecure:
DECLARE
bk_data CGC$CL_1_9_DKD.cgc$rec_tab;
BEGIN
PLSQL_TABLE.POPULATE_TABLE(bk_data, 'DKD', PLSQL_TABLE.LOCK_RECORDS);
CGC$CL_1_9_DKD.lck(bk_data);
END;
It seems, it has some problems on populating the "code" attribute in bk_data.
how to solve this problem without massive re-coding??.
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Oct 4, 2012
I have contents like below:
BREAD,BISCUIT
BREAD,MILK,BISCUIT
COKE,MILK
MILK,SUGAR
Now combination from each row will be like below (Just for understanding):
BREAD,BISCUIT --> [COMBINATION] {BISCUIT} {BREAD} {BISCUIT,BREAD}
BREAD,MILK,BISCUIT --> [COMBINATION] {BISCUIT} {BREAD} {MILK} {BISCUIT,BREAD} {BISCUIT,MILK} {BREAD,MILK} {BISCUIT,BREAD,MILK}
COKE,MILK --> [COMBINATION] {COKE} {MILK} {COKE,MILK}
MILK,SUGAR --> [COMBINATION] {MILK} {SUGAR} {MILK,SUGAR}
Now the ultimate aim is to find unique combinations (even if the same combination is present in different rows, we have to consider it as one combination), along with its frequency, result will be like below:
BISCUIT [occurence in 2 transactions and total 4 transactions] = 2/4 = .5
BREAD [occurence in 2 transactions and total 4 transactions] = 2/4 = .5
COKE [occurence in 1 transactions and total 4 transactions] = 2/4 = .25
MILK = 3/4 = .75
[Code]....
writing query to find unique combination like above? What I have tried is as below:
create table test (row_no number, col_no number, item varchar2(50))
/
insert into test values (1,1,'BREAD');
insert into test values (1,2,'BISCUIT');
insert into test values (2,1,'BREAD');
[Code]....
But I am not able to form the exact query. let me know if this can't be done through a single query.
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