SQL & PL/SQL :: Changing Order Of Columns?
Apr 30, 2012
i have a table test on 4 different-different database, at the starting structure is same in all the database. and now i want to change the datatype of the primary key column named "testid" , then i add a temp column in test table (and it is added at the last in table).
i have copied the data of testid in temp column and renamed it as testid and i dropped the testid column , then the problem is that primary key column will comes at last and i want to make it like previous position so that there will not be any difference in all 4 database as in structure.
is it possible to changing column order as our desire without dropping the table?and i made all the script to changing the datatype of primary key column.
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Jul 18, 2010
i have a table named employees in which there are 2 columns dep_id and name. One record having name as annie has dep_id=null .
When i arrange the records of the table in ascending order using order by dep_id the record with name annie and dep_id is placed in the last because null is consired largest. How can I bring that record to the top without changing the ascending order of the dep_id.
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Nov 30, 2009
my simplified database schema is:
Order
OrderID
Status
OrderItems
OrderID
EAN
Amount
Store
EAN
Amount
now,I need trigger that will on updating table Order and changing status to "GoodsReceived" increase amounts in Store according to values in OrderItems.
create or replace trigger order_received_trigger
before update
on Order
for each row
begin
if (:old.status=4 and :new.status=1) then
/*
select ean, sum(amount)
from OrderItems
where OrderID=:old.OrderID
group by ean;
*/
end if;
end;
but now i dont know how to apply that select on table Store.
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May 1, 2008
How to avoid sort operation by an order by clause without changing the sort area size.what hints or changes should be done in query so that order by clause work faster.
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Aug 13, 2013
Changing rows to columns without using pivot and aggregate functions?
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Oct 9, 2013
I have a query to pull the first contact of students.
The table has all contacts like parent/guardian, friends family, emergency contact etc.
I would like to the first primary contact in this order,
1. initial contact, 2. same as student address and also have to be parents,
3. live with and also a parent, 4. parents 5. friends.
I don't know how to pull 2 and 3 . because it looks like it needs to concatenate the columns.
here is my initial query
Select Min(U2.Id) Keep (Dense_Rank First Order By U2.Initial_Contact Desc, U2.Same_As_Students_Address Desc,u2.lives_with DESC,U2.Guardian Desc)
From Contacts
how to achieve 2 and 3?
The table script is attached. All the above columns are 1 or 0.
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Jun 26, 2013
I want to do 'ORDER BY' by concatenating the two columns(date +varchar2).But not working and geting the error - ORA-01855: AM/A.M. or PM/P.M. required
SQL> create table dat2 (
mod_date date,
am_pm varchar2 (10) ) ; 2 3
Table created.
SQL> INSERT INTO DAT2 ( MOD_DATE, AM_PM ) VALUES (
TO_Date( '06/05/2003 12:00:00 AM', 'MM/DD/YYYY HH:MI:SS AM'), '7:25AM'); 2
1 row created.
[code]...
ERROR at line 2:
ORA-01855: AM/A.M. or PM/P.M. required
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Jul 19, 2012
What should be the order of columns while creating b-tree non-unique index.
Low cardinality first
or
Hight cardinality first
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Apr 24, 2013
Using Application Express 4.2.1.00.08
Any problem using 4.2's One Level Tabs - Content Frame page where you have a parent region (of type content frame Body Container ) while number of child regions (of type Hide & Show Region - Borderless ), if you want to re-order them by changing the sequence, it has no effect when you run the page.
The regions still show in the same order top to bottom as it did before the update of sequences. Heading links (to show/hide child regons in content frames) has the same ordering as before.
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Mar 20, 2012
Which step in the following plan is the first step of execution
I reckon it is "TABLE ACCESS BY INDEX ROWID| BANK_BATCH_STATE"
Is that correct?
In the "Predicate Information (identified by operation id):"
section the predicates - access and filter for the step "TABLE ACCESS FULL | PYMNT_DUES" are displayed first
Isn't there any relation between the order of execution steps and the order in which predicates are displayed?
Execution Plan
----------------------------------------------------------
Plan hash value: 538700484
-------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 2364 | 15 (14)| 00:00:01 |
|* 1 | FILTER | | | | | |
| 2 | HASH GROUP BY | | 1 | 2364 | 15 (14)| 00:00:01 |
| 3 | NESTED LOOPS | | 1 | 2364 | 14 (8)| 00:00:01 |
| 4 | NESTED LOOPS | | 1 | 2313 | 13 (8)| 00:00:01 |
| 5 | NESTED LOOPS | | 1 | 2281 | 12 (9)| 00:00:01 |
| 6 | NESTED LOOPS OUTER | | 1 | 2255 | 11 (10)| 00:00:01 |
|* 7 | HASH JOIN | | 1 | 175 | 6 (17)| 00:00:01 |
|* 8 | INDEX RANGE SCAN | INDX_2 | 12 | 612 | 2 (0)| 00:00:01 |
|* 9 | TABLE ACCESS FULL | PYMNT_DUES | 43 | 5332 | 3 (0)| 00:00:01 |
| 10 | VIEW PUSHED PREDICATE | | 1 | 2080 | 5 (0)| 00:00:01 |
| 11 | NESTED LOOPS | | 1 | 154 | 5 (0)| 00:00:01 |
| 12 | NESTED LOOPS | | 1 | 103 | 4 (0)| 00:00:01 |
|* 13 | TABLE ACCESS BY INDEX ROWID| BANK_BATCH_STATE | 1 | 32 | 2 (0)| 00:00:01 |
|* 14 | INDEX RANGE SCAN | INDX_BBS_1 | 3 | | 1 (0)| 00:00:01 |
|* 15 | TABLE ACCESS BY INDEX ROWID| DAILY_CHECK | 1 | 71 | 2 (0)| 00:00:01 |
|* 16 | INDEX RANGE SCAN | INDX_SEARCH | 1 | | 1 (0)| 00:00:01 |
|* 17 | INDEX RANGE SCAN | INDX_2 | 1 | 51 | 1 (0)| 00:00:01 |
|* 18 | INDEX RANGE SCAN | INDX_IAM_SR_NO | 1 | 26 | 1 (0)| 00:00:01 |
|* 19 | INDEX RANGE SCAN | INDX_2 | 1 | 32 | 1 (0)| 00:00:01 |
|* 20 | INDEX RANGE SCAN | INDX_2 | 1 | 51 | 1 (0)| 00:00:01 |
-----------------------------------------------------------------
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Sep 6, 2011
I have below tables,
describe rpthead
Name Null Type
--------------------------- -------- -------------
RPTNO NOT NULL NUMBER
RPTDATE NOT NULL DATE
RPTD_BY NOT NULL VARCHAR2(25)
PRODUCT_ID NOT NULL NUMBER
describe rptbody
Name Null Type
------------- -------- -------------
RPTNO NOT NULL NUMBER
LINENO NOT NULL NUMBER
COMMENTS VARCHAR2(240)
UPD_DATE DATE
The fact is that we store some header in RPTHEAD and store real data in RPTBODY, the question is that if I use below SQL to query all data for a 'PRODUCT_ID'.
SELECT t0.LINENO, t0.COMMENTS, t0.RPTNO, t0.UPD_DATE
FROM RPTBODY t0 , RPTHEAD rpthead
WHERE
(
t0.RPTNO = rpthead.RPTNO
AND
t0.UPD_DATE>=to_date('1970/01/01 00:00:00','YYYY/MM/DD hh24:mi:ss')
AND
rpthead.PRODUCT_ID IN ('4647')
)
I do not want to have 'ORDER by' clause since data set is too large, the sorting takes long time, is there any way to get the result rows in the order sorted by RPTNO? We have the index for RPTNO on RPTBODY.
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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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Jul 12, 2012
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 :
Employee table :
Employee_id Emp_fname emp_lname emp_mname dept salary emp_height emp_weight
1 aaa ddd d1 100 6 180
2 bbb ccc 120 169
3 dfe d2 5.9 223
The expected result is :
result1 result2 result3 result4 result5 result6 result7 result8
1 aaa ddd d1 100 6 180
2 bbb ccc 120 169
3 dfe d2 5.9 223
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Feb 18, 2011
I have been implementing a script to change a lot of data in a database production.Because of this the database will be 100% dedicated to the execution of that script, in the sense that nothing else will be running in this period (the application will be stopped).
what can i do to improve performance of that execution? is there any oracle manual online for this type of problem? I do not know if it's possible, but I'm thinking of things like disabling locking mechanism (if possible I could run instead of a process many processes in parallel), disabling index growing (during the process), disabling constraints.
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Nov 23, 2009
I have a table in which years are stored in the form '2008/2009'. This is making it very difficult for me to do any calculations on that field and so I was wondering if there was a way to change the years (in a query and not in the actual table) so that if the year was '2008/2009' I would have just '2009'.
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Nov 23, 2011
I created a table of Number(20,4) column. I inserted an amount value 999999999999999.5555 but this value is rounded off to 1000000000000000.0000 automatically in Oracle. How to avoid this? I tried for less number of digits and I am getting the exact value. Is there any way to get the exact value without changing the datatype?
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Oct 27, 2012
I am struggling with the ORA_ROWSCN pseudocolumn. (Oracle version is 11g). I am aware that without ROWDEPENDANCIES set on the tables, the SCN of a row is in reality that of the block in which the row is resides. The problem I am seeing goes something like this:
1) A datapump import creates a large table (400M+ rows) at 11 am in the morning
2) No subsequent changes are made to this table (at least that I know of)
3) Despite no changes being made the ORA_ROWSCN of almost all the rows changes every few minutes. (a few rows remain with SCN's indicating the original time of import, but the rest change)
I detect this behavior by running this query:
SELECT ora_rowscn, SCN_TO_TIMESTAMP(ora_rowscn),COUNT(*)
FROM test_table GROUP BY ora_rowscn
This ran around 5.15 am on 10/27 and resulted in:
72353518 27-OCT-12 05.17.21.000000000 AM 492009391
67515248 26-OCT-2 11.01.45.000000000 AM 370
Note that almost all rows have a very recent SCN. Only a tiny portion of the rows (370) have an SCN consistent with when the import completed. If I rerun the query a bit later, the SCN of the large rowcount will have advanced again.Block size on the database is 8192.
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Nov 16, 2011
I need to change Virtual IP for one of my RAC node as it is conflicting with another server's IP.
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Jul 22, 2012
change my row value as column head. Here are my scripts:
Create table temp (code varchar2(3), head varchar2(4), value number(5));
insert into temp values('101','1101',500);
insert into temp values('101','1102',700);
insert into temp values('101','1103',600);
insert into temp values('102','1101',1000);
insert into temp values('102','1102',800);
insert into temp values('102','1103',900);
insert into temp values('103','1101',600);
insert into temp values('103','1102',400);
insert into temp values('103','1103',500);
select * from temp;
CODEHEADVALUE
1011101500
1011102700
1011103600
1021101100
1021102800
1021103900
1031101600
1031102400
1031103500
Now I like to get the above oputput as under:
Code 1101 1102 1103
101 500 700 600
102 100 800 900
103 600 400 500
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Oct 25, 2011
oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
PL/SQL Release 11.1.0.6.0 - Production
"CORE 11.1.0.6.0 Production"
In the database, NLS_DATE_FORMAT = DD-MON-RR.I have a date field called LOAD_DATE in one of the tables. I want to store the value as '25-OCT-11 01:16:25 PM' in LOAD_DATE field. Is there a way to do it without changing the NLS parameter (ALTER SESSION...) ?
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Oct 26, 2012
I have created my schema in SYSTEM schema way back accidentally by forgetting to specify the database tablespace. There is about 60 objects (tables, indexes, functions etc) and 6MB Of data.
What would be the best way migrate the schema to the tablespace I planned to put it into? .
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Jul 9, 2012
How to move the datafile from e-drive to d-drive in oracle 11g?
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Jul 22, 2013
Current database scn is changing faster even though no application,no transaction is running. Database is idle but scn is changing continue, why?
17:25:00 SQL> select current_scn from v$database;
CURRENT_SCN
-----------
2477896
1 row selected.
[code]....
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Nov 14, 2011
Some time we use message function in oracle forms.
message('...');
can we change the type of this message? Icon should be caution instead of Stop.
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Feb 19, 2007
Is there a way of changing the values of sysdate in a session only?
not the formate the actual values
is if the date was 31/12/2003 and i wanted to change it to 31/05/2003
could this be done
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Aug 21, 2012
I have a procedure which will execute on every Monday. Same is not executed last Monday. Can I execute the Procedure on some other day with out changing the actual procedure?
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Oct 20, 2011
I have been asked to create a new instance of an application server. As part of this, my management has asked me to replace any old JREs or JDKs.
We run 10g, so I installed the 10203_vista_w2k8_x86_production_client on my new server. I would like to replace the 1.4.2 JDK that is bundled with the Oracle Production Client with 1.6.0.
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Jul 13, 2012
We are about to undertake a storage migration of our RAC environment from EMC to XIV storage.
The migration method we are using means that we will be presented with identical disks post the migration, however the UNIX paths to the disk devices will be changing. Using our migration method it is not possible to present the old and new devices at the same time.
Therefore once the migration is complete i need to update the device configuration to reflect the new paths. I believe this is done using the following techniques but I am unsure as some of the documentation is ambiguous and I have not done this before
Changing path to Voting Disks
crsctl add css votedisk <new_path_to_disk> -force
crsctl delete css votedisk <old_path_to_disk> -force
Changing path to OCR Disks
ocrconfig repair ocr <new_path_to_ocr>
ocrconfig repair ocrmirror <new_path_to_ocrmirror>
Changing paths to ASM disks
alter system set asm_diskstring='<new_device_path>' scope=both;
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