Comparison of the 2 columns from the same table

Mr President.

I have a table xyz that has 10 million rows

who has 3 columns

ProfileId personid fpersonid

I find on all of the profileids that do not match personid = fpersonid

is there a way better and faster outside self-join?

Select a. profileid xyz a, b of xyz where a.personid! = b.fpersonid

Your SQL is incorrect.

Just use... . Select xyz profileid where personid! = fpersonid

Tags: Database

Similar Questions

Comparison of columns in the same Table, with the exception

Hi all

I need compare two values of column in the same table. But should ignore a few characters like space, comma, point

Following should be consistent

'ABcd f' = 'AbCDf'
'xyz ..' = 'xy z'

How is it possible

See you soon

Sexy

with t as
(
select 'ABcd f' col1,'AbCDf' col2 from dual union all
select 'xyz ..','xy z' from dual union all
select 'xyz ..x','xy z' from dual
)
select *
from t
where upper(translate(col1,'a ,.','a')) =
           upper(translate(col2,'a ,.','a'));

COL1    COL2
------- -----
ABcd f  AbCDf
xyz ..  xy z

Published by: JAC on 4 February 2013 17:22

place a select query calculation in a different column in the same table

How can I put my calculation result in a column named within the same table?
I have a table called: dgpercentagedatachart
I use the columns of this dgpercentagedatachart: totalcecrating divided by lowestfeederrating times 100 to get the percentage
In the query, I gave the result the Alias of the cal
What I want is to put this result in my application or my calculation (in percentage) in my column "percent" on my table of dgpercentagedatachart vacuum.
How can I configure this syntax?
This is the select query, I came with:
Select dgpercentagedatachart.totalcecrating, dgpercentagedatachart.lowestfeederrating,.
100.00*dgpercentagedatachart.totalcecrating/dgpercentagedatachart.lowestfeederrating as cal
of dgpercentagedatachart;
Here are the results:
CAL lowestfeederrating Totalcecrating
8,978 7.48166666666666666666666666666666666667 120
30.951 25.7925 120
5.04 120 4.2

Hello

2685870 wrote:

How can I put my calculation result in a column named within the same table?

I have a table called: dgpercentagedatachart

I use the columns of this dgpercentagedatachart: totalcecrating divided by lowestfeederrating times 100 to get the percentage

In the query, I gave the result the Alias of the cal

What I want is to put this result in my application or my calculation (in percentage) in my empty column '%' on my table of dgpercentagedatachart .

How can I configure this syntax?

This is the select query, I came with:

Select dgpercentagedatachart.totalcecrating, dgpercentagedatachart.lowestfeederrating,.

100.00*dgpercentagedatachart.totalcecrating/dgpercentagedatachart.lowestfeederrating as cal

of dgpercentagedatachart;

Here are the results:

CAL lowestfeederrating Totalcecrating

8,978 7.48166666666666666666666666666666666667 120

30.951 25.7925 120

5.04 120 4.2

To change an existing column in a table, you can use the UPDATE or MERGE, instructions like this:

UPDATE dgpercentagedatachart

Percentage of VALUE = 100,00 * totalcecrating

/ lowestfeederrating

;

Noramlly, tables is not redundant columns like this. If percent can always be calculated from other columns, then it is probably better to calculate at run time and store it in the database, where you will have to be updated each time the columns it depends on change. You can use a view to avoid having to encode them the calculation.

If you really don't want a column that can be calculated in the same lines other columns, then use a virtual column (if you use Oracle 11 or higher).

I hope that answers your question.

If this isn't the case, please post a small example of data (CREATE TABLE and only relevant columns, INSERT statements) for all of the tables involved and also publish outcomes from these data.

If you ask on a DML statement, such as UPDATE, the sample data will be the content of the or the tables before the DML, and the results will be the State of the or the tables changed when it's all over.

Explain, using specific examples, how you get these results from these data.

Always say what version of Oracle you are using (for example, 11.2.0.2.0).

See the FAQ forum: Re: 2. How can I ask a question on the forums?

Question: Is foreign key references to a different column in the same table

Hello
I'm not grasp this concept. Would you be able to provide the logic how and why you need to create a foreign key that references a column of the same table?
For example, referencing the schema, SupervisorNo @ here is a FOREIGN KEY to the "EmpNo" column in the same table.
EMPLOYEE (EmpNo, title, Fname, Lname, phone, Email, date of birth, sex, salary, HireDate, OutNo, SupervisorNo @)

Why would you want to do this and how can it be used? If you are filling out the data in the table, and this constraint is enabled, you will not be able to load whatever it is because the "EmpNo" column will be empty.

Any input you can provide me with this would be greatly appreciated. Thank you!

His name

Self-referential integrity constraints

Lets say that we have the table emp with emp_no and mgr_no columns.

Now all managers should also be an employee too. How can I check this when inserting data into this table? I applied auto integrity constraint. It would help me to make sure no handler (doesn't mean no mgr_no) must be registered if this Manager is not an employee of this organization. Which means, I won't be able to enter any mgr_no in the column until and unless that the same employee also is an employee (emp_no from the same table).

Check the link as well below.

Data integrity

Thank you

Ishan

How to update columns with the value of other lines in the same table
Hello

I use Oracle 11.2, I'd use SQL statements to update a column based on values in other rows in the same table. Here are the details:

create table TB_test (number 4 myId, crtTs date, date of MDPU);

insert into tb_test (1, to_date ('20110101', 'YYYYMMDD'), null);
insert into tb_test (1, to_date ('20110201', 'YYYYMMDD'), null);
insert into tb_test (1, to_date ('20110301', 'YYYYMMDD'), null);
insert into tb_test (2, to_date ('20110901', 'YYYYMMDD'), null);
insert into tb_test (2, to_date ('20110902', 'YYYYMMDD'), null);

After you run the SQL code, I would like to have the following result:

1, 20110101, 20110201
1, 20110201, 20110301
1, 20110301, null
2, 20110901, 20110902
2, 20110902, null

Thanks for your suggestion.
I guess you need this, otherwise please explain logic correctly:
```
SQL> merge into tb_test t
  2  using (
  3    select rowid as rid
  4         , lead(crtts) over(partition by myid order by crtts) as updts
  5    from tb_test
  6  ) v
  7  on (t.rowid = v.rid)
  8  when matched then update
  9   set t.updts = v.updts
 10  ;

5 rows merged.

SQL> select * from tb_test order by 1,2;

      MYID CRTTS     UPDTS
---------- --------- ---------
         1 01-JAN-11 01-FEB-11
         1 01-FEB-11 01-MAR-11
         1 01-MAR-11
         2 01-SEP-11 02-SEP-11
         2 02-SEP-11
```

update to column values (false) in a copy of the same table with the correct values
Database is 10gr 2 - had a situation last night where someone changed inadvertently values of column on a couple of hundred thousand records with an incorrect value first thing in the morning and never let me know later in the day. My undo retention was not large enough to create a copy of the table as it was 7 hours comes back with a "insert in table_2 select * from table_1 to timestamp...» "query, so I restored the backup previous nights to another machine and it picked up at 07:00 (just before the hour, he made the change), created a dblink since the production database and created a copy of the table of the restored database.

My first thought was to simply update the table of production with the correct values of the correct copy, using something like this:

Update mnt.workorders
Set approvalstat = (select b.approvalstat
mnt.workorders a, mnt.workorders_copy b
where a.workordersoi = b.workordersoi)
where exists (select *)
mnt.workorders a, mnt.workorders_copy b
where a.workordersoi = b.workordersoi)

It wasn't the exact syntax, but you get the idea, I wanted to put the incorrect values in x columns in the tables of production with the correct values of the copy of the table of the restored backup. Anyway, it was (or seem to) works, but I look at the process through OEM it was estimated 100 + hours with full table scans, so I killed him. I found myself just inserting (copy) the lines added to the production since the table copy by doing a select statement of the production table where < col_with_datestamp > is > = 07:00, truncate the table of production, then re insert the rows from now to correct the copy.

Do a post-mortem today, I replay the scenario on the copy that I restored, trying to figure out a cleaner, a quicker way to do it, if the need arise again. I went and randomly changed some values in a column number (called "comappstat") in a copy of the table of production, and then thought that I would try the following resets the values of the correct table:

Update (select a.comappstat, b.comappstat
mnt.workorders a, mnt.workorders_copy b
where a.workordersoi = b.workordersoi - this is a PK column
and a.comappstat! = b.comappstat)
Set b.comappstat = a.comappstat

Although I thought that the syntax is correct, I get an "ORA-00904: 'A'. '. ' COMAPPSTAT': invalid identifier ' to run this, I was trying to guess where the syntax was wrong here, then thought that perhaps having the subquery returns a single line would be cleaner and faster anyway, so I gave up on that and instead tried this:

Update mnt.workorders_copy
Set comappstat = (select distinct)
a.comappstat
mnt.workorders a, mnt.workorders_copy b
where a.workordersoi = b.workordersoi
and a.comappstat! = b.comappstat)
where a.comappstat! = b.comappstat
and a.workordersoi = b.workordersoi

The subquery executed on its own returns a single value 9, which is the correct value of the column in the table of the prod, and I want to replace the incorrect a '12' (I've updated the copy to change the value of the column comappstat to 12 everywhere where it was 9) However when I run the query again I get this error :

ERROR on line 8:
ORA-00904: "B". "" WORKORDERSOI ": invalid identifier

First of all, I don't see why the update statement does not work (it's probably obvious, but I'm not)

Secondly, it is the best approach for updating a column (or columns) that are incorrect, with the columns in the same table which are correct, or is there a better way?

I would sooner update the table rather than delete or truncate then re insert, as it was a trigger for insert/update I had to disable it on the notice re and truncate the table unusable a demand so I was re insert.

Thank you
Hello

First of all, after post 79, you need to know how to format your code.

Your last request reads as follows:
```
UPDATE
  mnt.workorders_copy
SET
  comappstat =
  (
    SELECT DISTINCT
      a.comappstat
    FROM
      mnt.workorders a
    , mnt.workorders_copy b
    WHERE
      a.workordersoi    = b.workordersoi
      AND a.comappstat != b.comappstat
  )
WHERE
  a.comappstat      != b.comappstat
  AND a.workordersoi = b.workordersoi
```
This will not work for several reasons:
The sub query allows you to define a and b and outside the breakets you can't refer to a or b.
There is no link between the mnt.workorders_copy and the the update and the request of void.

If you do this you should have something like this:
```
UPDATE
  mnt.workorders     A      -- THIS IS THE TABLE YOU WANT TO UPDATE
SET
  A.comappstat =
  (
    SELECT
      B.comappstat
    FROM
      mnt.workorders_copy B   -- THIS IS THE TABLE WITH THE CORRECT (OLD) VALUES
    WHERE
      a.workordersoi    = b.workordersoi      -- THIS MUST BE THE KEY
      AND a.comappstat != b.comappstat
  )
WHERE
  EXISTS
  (
    SELECT
      B.comappstat
    FROM
      mnt.workorders_copy B
    WHERE
      a.workordersoi    = b.workordersoi      -- THIS MUST BE THE KEY
      AND a.comappstat != b.comappstat
  )
```
Speed is not so good that you run the query to sub for each row in mnt.workorders
Note it is condition in where. You need other wise, you will update the unchanged to null values.

I wouold do it like this:
```
UPDATE
  (
    SELECT
      A.workordersoi
      ,A.comappstat
      ,B.comappstat           comappstat_OLD

    FROM
      mnt.workorders        A      -- THIS IS THE TABLE YOU WANT TO UPDATE
      ,mnt.workorders_copy  B      -- THIS IS THE TABLE WITH THE CORRECT (OLD) VALUES

    WHERE
      a.workordersoi    = b.workordersoi      -- THIS MUST BE THE KEY
      AND a.comappstat != b.comappstat
  ) C

SET
  C.comappstat = comappstat_OLD
;
```
This way you can test the subquery first and know exectly what will be updated.
This was not a sub query that is executed for each line preformance should be better.

Kind regards

Peter

Conflicts of SQL columns on the same table
I have a table with two columns used for the same purpose. Examples (start_date and career_history_start) (end_date or career_history_end).
The columns have different (varchar2 and date) data types. The developer has used the data type date (start_date) to write the report and of the use of time even the vachar2 to manully insert date. We decided to use a single (varchar2). Meanwhile, there are differences in the two columns. We will find the difference between the two columns start_date (date) and career_history_start (varchar2).

No idea what query will accomplish this considering they gave different type on the same table?

Here is the description of the table:

career_history / / DESC
Name of Type Null
--------------------------- -------- -------------
CAREER_HISTORY_ID NOT NULL NUMBER (38)
PERSON_ID NUMBER (38)
CAREER_HISTORY_START VARCHAR2 (50)
CAREER_HISTORY_END VARCHAR2 (50)
CAREER_HISTORY_DESC VARCHAR2 (250)
CAREER_HISTORY_RECNUM NUMBER (38)
Start_date DATE
End_date DATE
CAREER_HISTORY_ACTIVE_FLAG CHAR (1)
CAREER_HISTORY_DELETED_FLAG CHAR (1)
CAREER_HISTORY_UPDATE_TIME TIMESTAMP (6)
CAREER_HISTORY_UPDATED_BY VARCHAR2 (50)
NUMBER OF SORT_NUM
The customer doesn't care how the data is stored in the database. He care how it is displayed.

What happens if your client has another office in a zone schedule differnet and each office needs display their time locally, but the server must store all the time in the same zone. How do they manage that when storing dates as a varchar data type. You get that kind of built-in functionality when you use a date data type

In its simplest form if the customer is always display the data as a string, and then create a view from top of the table and convert dates in any format the customer prefers and that expose to the client.

In this way, you get data stored properly and the client allows you to view data in the way they prefer

Can we have hash partition and list on 2 columns in the same table. How.
Can we have hash partition and list on 2 columns in the same table. How.

Work on 10g release 2
# List-Hash is a valid composite partitioning strategy 11 from g.

Report with multiple columns NUMBER of counts of the same table
I am new to discoverer, so I'm a little lost.

I work to create a report to show usage data and Knowledge Base of e-business. I have written using subqueries in SQL query that is in the format:

Solution number | Soultion title | Solution views. Positive feedback | Negative feedback
Title of 12345 _ 345 _ 98 34

The entries 'Views', 'Positive' and 'Negative' are stored in the same table, so I do a count where setid = setid and usedtype = VS, then count where usedtype = usedtype and PF = NF

Discoverer, I can get the number of solution, the title and THE totals but I can't seem to understand how to get an ACCOUNT for three different things from the same table in the columns on the same line.

When I go on change map-> select the items once I select the option NUMBER of the UsedType column in the CS_KB_SET_USED_HISTS table, I can't select it again. I also found way now to add a column based on a query entered.

If someone could help it would be much appreciated.

Thank you

Published by: Toolman21 on December 2, 2010 14:17
_ to correct spacing added.
Hello
You can separate the column with a case or decode.
for example to create 2 calculations:

case
When usedtype = "PF".
then - that contain both
0 otherwise
end

case
When usedtype = 'NF '.
then - that contain both
0 otherwise
end

After that, you can create the aggregation count on those.

Tamir

Update the same column in the same table
Hello

How do update you a records of column in the same table?

I have purchase_order of the table. Consists of column ID, color, Purchase_No, Sub purchase.

< pre >

Create table Purchase_Order)
Identification number,
color varchar2 (10),
purchase_No varchar2 (5).
purchase_sub varchar2 (2));
< / pre >

< pre >

ID color Purchase_No purchase Sub
6416 S1406 PURPLE 3
6415 S1406 GREEN 2
6414 S1406 GREEN 1
6419 S1406 3
6417 S1406 1
6418 S1406 2

< pre >

6 unique ID records is in the same site. But 2 ID will be confined to a purchase_sub.

For example

6416,6419 purchase_no S1406 but has the same purchase_sub who need 3.I 6419 color "Purple".

Expected results:
< pre >

ID color Purchase_No purchase Sub
6416 S1406 PURPLE 3
6415 S1406 GREEN 2
6414 S1406 GREEN 1
6419 S1406 PURPLE 3
6417 S1406 GREEN 1
6418 S1406 GREEN 2

< / pre >

Thank you!

Published by: CrackerJack on May 4, 2009 15:04
Hello

Try this,
```
UPDATE Purchase_Order a
   SET a.Colour = (SELECT colour
                     FROM Purchase_Order b
                    WHERE a.Purchase_Sub = b.Purchase_Sub
                      AND b.colour Is Not Null)
 WHERE a.Colour Is Null
```
Kind regards
Christian Balz

Support for mandatory request - insert, select from the same table
Hi all

I need your help to write queries effectively.
Oracle Version: 10.2.0.3.0
OPERATING SYSTEM: UNIX

I have a METRICS_TBL that is mentioned below table.

CYCLE_DATE METRIC VALUE
08/17/2008 COST-TV 100
08/17/2008 COST-JOURNAL 50
08/17/2008 COST-POSTALMAIL 25
08/17/2008-PROD-TV 10
08/17/2008-PROD-JOURNAL 25
08/17/2008-PROD-POSTALMAIL 5

Any data above, I have to add (Insert into select METRICS_TBL METRICS_TBL) at the same table with the records as mentioned below.

2008-08-17 COSTPERPROD-TV 10
08/17/2008-COSTPERPROD-LOG 2
2008-08-17 COST PROD-POSTALMAIL 5

Basically, I need to calculate the cost per product for each category. Depending on the settings available, metric should also be changed as COSTPERPROD and values should be cost/prod under each category.

Can someone help me with the query.

Thank you
Something like this:
```
INSERT INTO metrics_tbl
(cycle_date, metrics, value)
SELECT cost.cycle_date
         , 'COSTPERPROD-'||cost.mtype
         ,cost.value / prod.value
FROM  (
   select cycle_date,substr(metrics, 1, 4) mtype, substrmetrics,instr(metrics,'-')+1) mmetric
   where substr(metrics, 1, 4) = 'PROD'
   ) prod
INNER JOIN (   select cycle_date,substr(metrics, 1, 4) mtype, substrmetrics,instr(metrics,'-')+1) mmetric
   where substr(metrics, 1, 4) = 'COST'
   ) cost on cost.cycle_date = prod.cycle_date and cost.mmetric = prod.mmetric
```
Ideally you would divide your METRICS column into two: one for the thing you're measuring (e.g. TV or NEWSPAPER) and the other for the metric (COST, PROD, COSTPERPROD etc.). That's what I did in the views online. Without it, it's kinda a mess and behave so, if the table becomes much more.

HTH

Nigel cordially

Edited by: nthomas on January 14, 2009 15:57 - small correction SQL

Make a column based on another value of the column in the same table

JDev 11.1.1.6.0

It may be a silly question but I'm stuck

I need to conditionally return a column that said Condition is as if the value in the other column of the same table B is equal to F. I should make A column only when this condition is met. I tried the following code:

	< af:column sortProperty = "PhoneNumber1."
	sortable = "false".
	headerText = "#{bindings." A.hints.PhoneNumber1.label}.
	ID = "c146.
	rendering = "#{rank." PhoneNumber1ResponseFlag eq 'F'} ">"
	< af:outputText value = "#{rank." PhoneNumber1}.
	ID = "ot130" / >
	< / af:column >
	< af:column sortProperty = "PhoneNumber1ResponseFlag."
	sortable = "false".
	headerText = "#{bindings." B.hints.PhoneNumber1ResponseFlag.label}.
	ID = "c80" rendered = "true" >
	< af:outputText value = "#{rank." PhoneNumber1ResponseFlag}.
	ID = "ot129" / >
	< / af:column >

The data presented in the table for the PhoneNumber1ResponseFlag column are F. Still my condition does not work.

Well, I've finally sorted it myself by managed bean.

Here are the steps I followed:

Wrote a new bean managed.
Added a Boolean variable called flag and made to true when the "'PhoneNumber1ResponseFlag ' current line attribute is equal to F."
Changing the property made column on this indicator.

Update lines with the info from the other rows in the same Table.
I'm trying to update the lines with the information of the same table. The table is loaded with information from a report that runs and there must be a new entry every month, but I would like to bring some of the info from the last month. This statement below works but updates all rows in the new load table and in my test case, I only did a few game only like 5 files need to get updates. It is an example of what I'm trying to do. If I add this (C2. COL_INVC_ID = C1. COL_INVC_ID) until the last "* where *" statement get an invalid identifier for 'C2 '. COL_INVC_ID ". So what I'm doing wrong here? How can I update only the lines where also in recent months run?

Thanks in advance for any help!

------------
Update OpenIssues OI1
Together (OI1. NUM, OI1. Status, OI1. Code, OI1. LastModifiedDate) =
(Select ios2. NUM, ios2. Status, ios2. Code, ios2. LastModifiedDate
Of OpenIssues ios2
Where OI2.num = OI1.num and ios2. TableLoadDate = TO_DATE (January 31, 2012 00:00:00 ',' ' the HH24: MI: SS DD/MM/YYYY)
)
Where and OI1. TableLoadDate = TO_DATE (February 29, 2012 00:00:00 ',' ' the HH24: MI: SS DD/MM/YYYY)
------------

SQLMe
As Frank suggested merger is much effective here, go...
```
  create table  temp
as(
select 1 eno, 1 amt , sysdate load_date from dual union all
select 1 eno, 2 amt , add_months(sysdate,1) load_date from dual union all
select 2 eno, 1 amt , sysdate load_date from dual union all
select 2 eno, 2 amt , add_months(sysdate,1) load_date from dual
);

merge into temp t
using (select eno, amt, load_date
         from temp
        where trunc(Load_Date) = TO_DATE('05/30/2012', 'MM/DD/YYYY')) s
on ((s.eno = t.eno) and trunc(t.Load_Date) = TO_DATE('06/30/2012', 'MM/DD/YYYY'))
when matched then
  update set t.amt = s.amt;
commit;

select * from temp;
```

Print from parent to child link or a path in the same table

create the dummy of the array (number of nodeid, parentid number, nodename varchar2 (20));

insert into the dummy values(100,-1,'homegoods');
insert into the dummy values(101,100,'kitchen');
insert into the dummy values(102,101,'skillet');

Select * modeling gives:

nodeid     parentid   node_name
100         -1         HOMEGOODS
101         100       KITCHEN
102         101       SKILLET

Note: the parent id is the id of the node in the same table, except for the top node.

Select nodeid, nodename, 'I want the full path from parent to child here' as the path from which dummy nodeid = 102

expected result

nodeid   name     path
102       skillet     homegoods>kitchen>skillet

How can I do this?
Thank you

Please post sample data!

You can use the sys_connect_by_path here:

hoek&XE> select nodeid
  2  ,      nodename
  3  ,      ltrim( sys_connect_by_path(nodename, '>') , '>') path
  4  from   dummy
  5  where connect_by_isleaf=1
  6  start with parentid = -1
  7  connect by prior nodeid = parentid;

    NODEID NODENAME             PATH
---------- -------------------- ------------------------------
       102 skillet              homegoods>kitchen>skillet

Copy the value1 to value2 column column in the same table
Hi all

If I want to update the values in column 2 stack with stack column. It's the same table 'Data_GU '.

RACK_ID STACK STACK2
S1009 706161522 S8322
S1009 706168051 S8322
S1009 706116417 S8322
S1009 706126698 S8322

I came with

UPDATE DATA_GU C
SET STACK2 =)
SELECT battery
OF DATA_GU B
) ;

I have an error returns unique lines and more than one line... How to on this subject. Thank you guys.
```
UPDATE DATA_GU
SET STACK2 = STACK
/
```
SY.

comparing string values in the same table

I have a table with ID (14 digit string values) starting with "A". Ex: A21849B1020792. There may be a different ID with the same substring 'B1020792' in the same table, example: A12349B1020792. If this happens, the ID of the last creation date of must be returned in the result. In other words, comparison is done on the same table. "In the example provided, say A12349B1020792 has the date of 1 January 2015 'and A21849B1020792 has date February 1, 2015", since A21849B1020792 has the most recent date, the result must contain only A21849B1020792.
ID create_date
---                              ------------------
A21849B1020792 02/01/2015
A12349 B1020792 01/01/2015
A12345B1234567 01/03/2015
A43567B1234567 01/04/2015

Here's the query I used:
substr (a.id, 7) select sc, max (a.create_date) cd1
of table a, table b
where a.id! = b.id
and substr (a.id, 7) = substr (b.id, 7)
and a.id like 'A %' and b.id like 'A %' / * (I used a % because I am interested only IDs that begin with A) * /.
and a.id ('A12349B1020792', 'A21849B1020792','A12345B1234567 ','A43567B1234567')
Group of substr (a.id, 7);
Result:
---------
sc                    cd1
---                    ------
B1020792 02/01/2015
B1234567 04/01/2015
There is one thing that I'm not able to do with my request, that is, be able to get real IDs list and not list of substrings. If I added a.id column in the select clause and the group by clause, the query includes both by substr (a.id, 7) and a.id and as a result, the query returns four lines as below:
substr (a.id, 7) select sc, max (a.create_date) cd1, a.id ID
of table a, table b
where a.id! = b.id
and substr (a.id, 7) = substr (b.id, 7)
and a.id like 'A %' and b.id like 'A %' / * (I used a % because I am interested only IDs that begin with A) * /.
and a.id ('A12349B1020792', 'A21849B1020792','A12345B1234567 ','A43567B1234567')
Group by substr (a.id, 7), a.id.
Result:
---------
sc                    cd1                      ID
---                    ------                   ---------
01/01/2015 A12349B1020792 B1020792
B1020792 01/02/2015 A21849B1020792
B1234567 01/03/2015 A12345B1234567
B1234567 01/04/2015 A43567B1234567

My goal is to retrieve a list of all the unique identifiers that have the later dates.

ID:
---
A21849B1020792
A43567B1234567

Thanks for your time in advance!

Hello

user11951344 wrote:

I have a table with ID (14 digit string values) starting with "A". Ex: A21849B1020792. There may be a different ID with the same substring "B1020792" in the same table, example: A12349B1020792. If this is the case, the ID of the last creation date must be returned in the result. In other words, comparison is done on the same table. "In the example provided, say A12349B1020792 updated 1 January 2015 ' and A21849B1020792 a date February 1, 2015", as A21849B1020792 has the most recent date, the result should contain only the A21849B1020792.

ID create_date

---                              ------------------

A21849B1020792 02/01/2015

A12349B1020792 01/01/2015

A12345B1234567 03/01/2015

A43567B1234567 01/04/2015

Here's the query I used:

substr (a.id, 7) select sc, max (a.create_date) cd1

of table a, table b

where a.id! = b.id

and substr (a.id, 7) = substr (b.id, 7)

and a.id like 'A %' and b.id like 'A %' / * (I used a % because I am interested only IDs that begin with A) * /.

and a.id ('A21849B1020792', 'A12345B1234567', 'A12349B1020792', 'A43567B1234567')

Group of substr (a.id, 7);

Result:

---------

sc                    cd1

---                    ------

B1020792 02/01/2015

B1234567 01/04/2015

There is one thing that I am not able to do with my request, that is, the ability to retrieve the list of IDs real and not a list of substrings. If I added a.id column in the select clause and the group by clause, the query groups according to the two substr (a.id, 7) and a.id and as a result, the query returns four lines as below:

substr (a.id, 7) select sc, max (a.create_date) cd1, a.id ID

of table a, table b

where a.id! = b.id

and substr (a.id, 7) = substr (b.id, 7)

and a.id like 'A %' and b.id like 'A %' / * (I used a % because I am interested only IDs that begin with A) * /.

and a.id ('A21849B1020792', 'A12345B1234567', 'A12349B1020792', 'A43567B1234567')

Group by substr (a.id, 7), a.id.

Result:

---------

sc                    cd1                      ID

---                    ------                   ---------

B1020792 01/01/2015 A12349B1020792

B1020792 02/01/2015 A21849B1020792

B1234567 03/01/2015 A12345B1234567

B1234567 01/04/2015 A43567B1234567

My goal is to retrieve a list of all the unique identifiers that have the later dates.

ID:

---

A21849B1020792

A43567B1234567

Thanks for your time in advance!

If it makes sense to treat the first 6 characters of the ID separately from the rest of the id in this problem, maybe it makes sense to store those two parts of the id in two different columns. Relational databases work best when each column of each row contains 1 single piece of data (at most). It is so fundamental to the design of table that he called the first normal form.

Given that the two parts are stored in column 1, so you can something like this Request Top - N:

WITH got_r_num AS

(

SELECT r.id

r.create_date AS cd1

, RANK () OVER (PARTITION OF SUBSTR (r.id, 7))

ORDER BY r.create_date DESC

) AS r_num

FROM table_x g - g for data values

JOIN table_x r - r for related values

ON SUBSTR (r.id, 7) = SUBSTR (g.id, 7)

WHERE g.id IN ('A12349B1020792'

, "A21849B1020792".

, "A12345B1234567".

, "A43567B1234567".

)

- AND g.id LIKE 'A %' - if necessary.   The above condition ensures already g.id start with "A".

AND r.id LIKE 'a % '.

)

SELECT id, create_date

OF got_r_num

WHERE r_num = 1

;

If you would care to post CREATE TABLE and INSERT instructions for the sample data, and then I could test this.

Comparison of the 2 columns from the same table

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