Auto increment pseudo column

Hi,
If I have a sql statement like "select e.name from employees e", how can i add a pesudo column which is auto incremented for each row fetched? So something like
incr_column name
1 Jack
2 Michael
3 Freud
Thank you

how can i add a pesudo column which is auto incremented for each row fetched?
Using ROWNUM Pseudocolumn :
SELECT   ROWNUM, ename FROM emp;
Using LEVEL Pseudocolumn :
select sysdate+1 from dual connect by level <=30
USing SEQUENCE Pseudocolumn :
CREATE SEQUENCE emp_seq
   START WITH 1
   INCREMENT BY 1
   MINVALUE 1
   MAXVALUE 2000
   NOCACHE
   NOCYCLE;
CREATE TABLE emp1 (empno number , ename VARCHAR2 (30), sal NUMBER);
INSERT INTO emp1
VALUES   (emp_seq.NEXTVAL,'BEN', 5000);
INSERT INTO emp1
VALUES   (emp_seq.NEXTVAL,'DVEN', 5000);
INSERT INTO emp1
VALUES   (emp_seq.NEXTVAL,'EVA', 5000);
SELECT   * FROM emp1;
commit;
SELECT   * FROM emp1;

Similar Messages

Auto-increment identity column through procedure in oracle 10g on windows

Hi,
I need identity primary key which should be auto increment before while inserting data into table.
for this i had use sequence and then trigger to increment it.
but now i need to increment it in Procedure, while my procedure is having code to insert data in same table which has primary key

Hi,
SNEHA RK wrote:
Hi,
I need identity primary key which should be auto increment before while inserting data into table.
for this i had use sequence and then trigger to increment it.Right. Some database products have auto-increment columns, and they are really handy. Unfortunately, Oracle does not have auto-increment columns. A sequence is an auto-increment object, and it's the right way to automatically generate unique identifiers, but you need to explicity reference the sequence, either in you DML statements, or in a trigger that will automatically fire before a DML statement.
but now i need to increment it in Procedure, while my procedure is having code to insert data in same table which has primary keyAre you saying that you need to increment the sequence, completely aside from INSERTing into the table?
If so, just reference sequence_name.NEXTVAL wherever you want to. In PL/SQL, you can say
SELECT sequence_name.NEXTVAL
INTO number_variable
FROM dual;This works in any version of Oracle, but starting in Oracle 11, you also have the option of referencing te sequence without using dual, or any other table.
I hope this answers your question.
If not, post a complete script that people can run to re-create the problem and test their ideas.
For example:
-- Here are the table and the seqauence that I created:
CREATE TABLE table_x ...
CREATE SEQUENCE ...
-- Here is the BEFORE INSERT trigger I wrote:
CREATE OR REPLACE TRIGGER ...
-- The trigger works exactly how I want it to in statements like this:
INSERT INTO table_x ...
-- So there are no problems (that I know of) with anything up to this point.
-- Now I want to use the same sequence to ...
-- so that when I execute a statement like this
-- then the next time I add a new row to the orginal table, like this
INSERT INTO table_x ...
-- then the contents of table_x should be ... because ...

Auto Increment column in database table

Hello experts, I am using oracle 11g database at windows 7.I have to create a sequence object and a table with an auto increment ID column.For this I have created a trigger before insert to select next sequence from a sequence object. It works well but Now I have the current sequence is 7 and there are 6 records inserted in table. Now I delete two records.Thus I have only 5 records in table but my current sequence is still 7.So if I put it in id column then a new record will be inserted in table with 7 ID number after 5th ID number.I want this record should be inserted with 6 Id number. For this I tried to not use sequence object.I tried a pl/sql trigger before insert, which will count the all records in table and after increment i put it in ID column to insertion....Is this a professional way..? thank You regards aaditya

979801 wrote:
Hello experts, I am using oracle 11g database at windows 7.I have to create a sequence object and a table with an auto increment ID column.For this I have created a trigger before insert to select next sequence from a sequence object. It works well but Now I have the current sequence is 7 and there are 6 records inserted in table. Now I delete two records.Thus I have only 5 records in table but my current sequence is still 7.So if I put it in id column then a new record will be inserted in table with 7 ID number after 5th ID number.I want this record should be inserted with 6 Id number. For this I tried to not use sequence object.I tried a pl/sql trigger before insert, which will count the all records in table and after increment i put it in ID column to insertion....Is this a professional way..? thank You regards aaditya
Sequences only guarantee unique numbers. You cannot (and should not) attempt to create gapless sesquences. That's not how oracle works and will not scale to a multi user application.
Imagine two people try to insert records at the same time (and have yet to commit), the trigger you create will count the number of records and determine there are 5 records, so assign the next number of 6, for both people who are inserting records. The first person to commit will get their data saved, and assuming you have a unique constriaint on that id, the second person will raise a duplicate key on insert or suchlike error.
Gapless sequential numbers are not appropriate to multi-user environments. Such requirements are often given by managers or business people who do not understand the technology.
Think of it in terms of a real world office, but with people using a paper system instead of a computer. The only way you can try to guarantee people get the next number and also re-use numbers that have been deleted is to have a single place where each person in the office goes to, to fetch the next number, and they have to queue up behind each other to get the next one off the list. But if someone has removed an old record, they've got to wait in the same queue to go and put that number back in the pot for someone else to use. It just doesn't work, even in a manual system. Yes, people can guarantee that they're only getting unique numbers that nobody else is using, but they cannot guarantee that they are reusing and filling gaps etc. It's an unrealistic expectation.

Insert data into Access with Auto-Increment column

Is there anyone out there that has come across this problem I am experiencing?
I have a form I'm trying to submit to an Access DB that has an Auto-Incremented Table Column. I have followed Stefan Cameron's instructions to a "T" on his blog page here:
http://forms.stefcameron.com/2006/09/18/connecting-a-form-to-a-database/
but I keep getting the following error"
GeneralError: Operation failed.
XFAObject.open:10:XFA:form1[0]:mysubform[0]:myEIFform[0]:overflowLeader[0]:Submit[0]:click
open operation failed. [Microsoft][ODBC Microsoft Access Driver] Number of query values and destination fields are not the same.
My OLEDB Connection Record Source is the SQL Query which reads: SELECT FedTaxID, LegalID FROM dbtest; My simple test DB is Access and its only 3 columns; dbID, FedTaxID, LegalID. dbID is the Auto-Incremented Column.
If I remove the Auto column from my DB table it inserts just fine but I get this error:
GeneralError: Operation failed.
XFAObject.open:10:XFA:form1[0]:mysubform[0]:myEIFform[0]:overflowLeader[0]:Submit[0]:click
ado2xfa operation failed. Item cannot be found in the collection corresponding to the requested name or ordinal.
I've looked over alot of the blogs and other help forums and there's info on Selects, I don't find much on Inserts.
Can anyone direct me in the right direction? Thank you.

First, please pay attention to the forum in which you are posting. This particular post would be more appropriate to tsql rather than datamining. Second, what specific problem are you trying to solve. The code you posted appears to be
correct. I will say that your DataTable will likely be a source of future problems if it contains only the 2 columns.

Auto-increment workflow reset

I have Sharepoint 2013, but created a Workflow in Sharepoint designer with Sharepont 2010 Workflow to assign an auto-increment column to a list. I have tested the list and the auto-incrementing is working great, however now I want to actively use the list
in the 'real' working capacity, but when I've deleted the previously entered test items the auto-increment column proceeds to increase. How can I restart/reset the number back to where it should start? Is it possible? Or do I need to delete my list and start
all over again from scratch both list and workflow?

Hi Tam,
How did you set the workflow to assign an auto-increment column to a list?
If the workflow is different, then there should be different solutions.
If you are using another list to store the numbers for the auto-increment column, then you can modify the columns in that list to be the value that you want to start with.
Here is a link about using another list to recalculate the next number with workflow:
http://gihanmaduranga.blogspot.jp/2012/09/create-auto-increment-number-column-in.html
If that is case of your workflow, then you can edit the Last Number column in the Counter list to be a number which you want to start with.
If you are using a different solution, could you please provide the detail steps of how you set the auto-increment column?
Best regards.
Thanks
Victoria Xia
TechNet Community Support

How can i create an auto increment column

Hello Everyone
We are working on an EAM package which has an auto number facility but that is not meeting our requirement because some 10s and 100s of numbers keep on jumping based on the number of records the child table has.Means every record in my parent table will have some child records in another table which we call it a child table.The number of numbers that will be jumped each time will depend on the number of child records it has. Now we want to create a new column and generate a sequential unique number in my parent table with out linking it to its child table and use this number as a reference number. And we cant do that through our package customization. Can any one guide us if we can meet our requirement through oracle triggers or so.
Thanks and Regards

Hi,
For "Auto-Increment" functionality - you can use a combination of a sequence and a trigger like so:
create table roles ( role_id INT
                   , role_name VARCHAR2(30) NOT NULL
                   , creation_date DATE DEFAULT SYSDATE NOT NULL
                   , role_description VARCHAR2(255)
                   , CONSTRAINT roles_pk PRIMARY KEY (role_id)
                   , CONSTRAINT roles_uk1 UNIQUE (role_name)
create sequence role_id_seq
start with 1
increment by 1
nocache;
CREATE OR REPLACE TRIGGER roles_pk_trig
BEFORE
insert on roles
for each row
begin
IF :new.role_id IS NULL THEN
   SELECT role_id_seq.NEXTVAL
   INTO :new.role_id
   FROM dual;
END IF;
end;
/Now any insert which leaves the "ROLE_ID" column NULL will have an auto-incremented value put in for that column. This is similar to an "Autonumber" column in Access.
Hope this helps...
Take care.

How to create auto increment value in my column using identity ?

hi Team,
I have an requirement where i create an auto increment value ,with my table column
Create table Temp(
DeptID int IDENTITY(1,1) PRIMARY KEY,
Name varchar(50),
Emailid nvarchar(50),
Phone varchar(50)
so this is my table structure ,Here my column name is
Deptid here i need to creat an autoincrement value with today's date like below
ex:STM0000120012015
STM0000221012015
STM0000322012015(Currentdate)
.......................................... like this
Here i need only one column like identity column with the given incremental order,not more than one column
so can u pls help me out any one.
Thanks!

Here the output came like this ,
1 STM0000120150121
2 STM0000220150121
3 STM0000320150121
4 STM0000420150121
5 STM0000520150121
6 STM0000620150121
7 STM0000720150121
8 STM0000820150121
9 STM0000920150121
10 STM00001020150121 --see this exceed length
and here i dnt need to increment that Stm000010,Here my output will come like this, idnt need to increment my charcter size
1 STM0000120150121
2 STM0000220150121
3 STM0000320150121
4 STM0000420150121
5 STM0000520150121
6 STM0000620150121
7 STM0000720150121
8 STM0000820150121
9 STM0000920150121
10 STM0001020150121
11 STM0001120150121
12 STM0001220150121
so here i dont need to increment my charcter length(16)
The length should be STM(3char)+00001(5Charcters)+CurrentDateFormat,
see the above suggested o/p
so can u pls help me out Dimant

Primary key column auto increment

Hello,
In my Azure SQL Database I noticed that weird thing is happening. I have table with primary key column with auto increment, and all works fine, on new insert that value automatically increment, but every now and then, that value, for no reason, increments
for 1000.
For instance i have in DB values in this order: 1, 2, 3, 4, 1001, 1002, 1003, 2004, 2005, 3001, 3002...
Why is this happening?

Hello ,
you can see this thread :
http://stackoverflow.com/questions/17012339/windows-azure-sql-database-identity-auto-increment-column-skips-values
It's seems that SQL Server work with sequence and block 1000 values. In the cloud, your SQL Azure Database can be move from one server to an other or restarted and so a new sequence is used. That's why you jump from 4 to 1001.
Regards

How can I automatically increment an auto incremented column?

Hello!
I have a table with an auto incremented "id" field.
It looks like this:
id (PK, auto_increment) name address phone
I would like to make an insertion like:
INSERT INTO Person (name, address, phone) VALUES (?,?,?)
...but it says that all fields have to be used.
I get
java.sql.SQLException: Field 'id' doesn't have a default value
How can I bypass this?
I have looked at [this example|http://blog.taragana.com/index.php/archive/java-how-to-get-auto-increment-values-after-sql-insert/] , but it didn´t work for me, it still says the "id" column has not a default value:

Sorry, it is a MySQL database.
The table consists of 4 columns:
id (PK, auto_increment)
name (Varchar)
address (Varchar)
phone (Varchar)
If I use PHPMyAdmin to insert a new row, then this query works:
INSERT INTO `mydb`.`person` (
`id` ,
`name` ,
`address` ,
`phone`
VALUES (
NULL , 'Test', 'Roxxor', 'Europe', '12345'
);{code}I tested to use the method setNull() on the first column in the preparedStatement but it didn´t work.
Do you need more info from me to be able to help me?
I have tried this (but got the error that the "Field 'id' doesn't have a default value"):
[code]con.setAutoCommit(true);
            String query = "INSERT INTO person(id, name, address, phone) VALUES (?, ?, ?, ?)";
            PreparedStatement stmt = con.prepareStatement(query);
            stmt.setNull(1, java.sql.Types.NULL);
            stmt.setString(2, name);
            stmt.setString(3, address);
            stmt.setString(4, phone);
            stmt.executeUpdate();
            stmt.close();[/code]

Primary key violation exception in auto increment column

Hi All,
I am facing one issue in Multi threaded environment.
I am getting Primary key violation exception in auto increment column. I have a table and the primary key is the auto increment column, and I have a trigger which is populating this column.
5 threads are running and inserting the data in the table and throwing Primary key violation exception randomly.
create table example (
id number not null,
name varchar2(30)
alter table example
add constraint PK1example primary key (id);
create sequence example_id_seq start with 1 increment by 1;
create or replace trigger example_insert
before insert on example
for each row
begin
select example_id_seq.nextval into :new.id from dual;
end;
Any idea how to handle auto increment column(trigger) in Multi threaded environment??
Thanks,

user13566109 wrote:
Thanks All,
Problem was in approach; removed the trigger and placed a seq.nextval in insert query. It has resolved the issue.I very much suspect that that was not the issue.
The trigger would execute for each insertion and the nextval would have been unique for each insertion (that's how sequences work in oracle), so that wouldn't have been causing duplicates.
I suspect, more likely, that you had some other code somewhere that was using another sequence or some other method of generating the keys that was also inserting into the same table, so there was a conflict in the sources of the sequences being generated.
The way you showed you had coded above, was a perfectly normal way to assign primary keys from a sequence, and is not a problem in a multi user/threaded environment.

Auto Increment Columns Are Not Recognized

Hi
I am using postgre 8 and there are some auto incremented columns
in some tables. The problem is when I create the DataProvider from a table or a view those columns are not recognized by the IDE. I realized this while running the generated SQL. Is this a known issue ? Finally is there a work around this.
Thanks
Mehmet Atlihan

Hi Mehmet,
Creator requires a JDBC 3 compliant driver and PostgreSQL database driver is not fully compliant. Please take a look at the below thread which discusses about the issue:
http://swforum.sun.com/jive/thread.jspa?forumID=123&threadID=53064
Cheers
Giri

How to create a column auto increment

I want create a table with one column can
auto increase after insert each row, but I
don't know how to?
Thanks.

Oracle doesn't have a native auto-increment field like some databases, so you need to code one using a sequence. I've had good success using a trigger on my table like the following:
CREATE OR REPLACE TRIGGER SAMPLE_TRIGGER BEFORE
INSERT ON SAMPLE_TABLE FOR EACH ROW begin
     if ( :new.TEAM_KEY is null ) then
          select "SAMPLE_sequence".nextval into :new.TEAM_KEY from dual;
     end if;
end;

Update table column with same auto-increment value, via T-SQL stored procedure

Good Evening to every one,
I have a table 'Contracts' as we can see in the picture below (I exported my data on An Excel Spreadsheet). Table's primary key is 'ID' column.
I am trying to create a stored procedure (i.e. updContractNum), through which I am going to update the 'Contract_Num' column, in every row where the values on Property_Code, Customer, Cust_Category and Amnt ARE EQUAL, as we can see in the schema above.
The value of Contract_Num is a combination of varchar and auto_increment (integer). For example, the next value on 'Contract number' column will be 'CN0005' for the combination of 11032-14503-02-1450,00
I' m trying to use CURSORS for this update but I am new in using cursors and I am stuck in whole process. I atttach my code below:
CREATE PROCEDURE updContractNum
AS
--declare the variables
DECLARE @CONTRACT_NUM VARCHAR(10); -- Contract Number. The value that will be updated on the table.
DECLARE @CONTRACT INTEGER; -- Contract number, the auto increment section on contract number
DECLARE @CONTR_ROW VARCHAR(200); -- Contract row. The row elements that will be using on cursor
DECLARE CONTRACT_CURSOR CURSOR FOR -- Get the necessary fields from table
SELECT PROPERTY_CODE, CUSTOMER, CUST_CATEGORY, AMNT
FROM CONTRACTS;
OPEN CONTRACT_CURSOR -- open a cursor
FETCH NEXT FROM CONTRACT_CURSOR INTO @CONTR_ROW
WHILE @@FETCH_STATUS = 0 -- execute the update, for every row of the tabl
BEGIN
--update Contract_Num, using the format coding : contract_number = 'CN' + 0001
UPDATE CONTRACTS
SET CONTRACT_NUM = 'CN'+@CONTRACT_NUM+1
END
CLOSE CONTRACT_CURSOR
Thank you in advance!

You dont need cursor
You can simply use an update statement like this
UPDATE t
SET Contract_Num = 'CN' + RIGHT('00000' + CAST(Rnk AS varchar(5)),5)
FROM
SELECT Contract_Num,
DENSE_RANK() OVER (ORDER BY Property_Code,Customer,Cust_category,Amnt) AS Rnk
FROM table
)t
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LINQ: Update a column with auto increment value

Hi All,
Greetings.
I am very new to C# (though with lot of experience in VC++). Now a days, I am engaged in a C# project where I need to deal with ADO.NET DataTable and related classes. I am stuck up in a scenario as follows:
I have a data table (of DataTable type) pre-populated with many rows (50000+), parsed from a log file. Now I need to add a column that will be holding index number for each records; eg. 1, 2, 3......
I have tried to add the auto-incremented column dynamically, with seed = 0 and increment = 1, but it is not working.
Is there any LINQ query that I can run to update the DataTable at once? Or foreach loop per DataRow is the only option here?
I appreciate any quick suggestion on this.
Thanks in advance.
Sanjoy Jana.

You should add the auto increment column to the DataTable before you pouplate it with the other data:
//1. Create a datatable
DataTable dt = new DataTable();
//2. add the autoincrement column:
DataColumn column = new DataColumn();
column.DataType = System.Type.GetType("System.Int32");
column.AutoIncrement = true;
column.AutoIncrementStep = 1;
column.AutoIncrementSeed = 1;
//3. Fill the dataTable using an SqlDataAdapter or whatever
dt.Columns.Add(new DataColumn("name"));
dt.Rows.Add("1");
dt.Rows.Add("2");
dt.Rows.Add("3");
dt.Rows.Add("4");
Then you don't have to add the "auto incremented" values yourself in some kind of a loop (using for example LINQ or foreach).
If you want to know how to poplulate the DataTable from a database query using an adapter, please refer to the following page:
http://www.dotnetperls.com/sqldataadapter
Hope that helps.
Please remember to mark helpful posts as answer to close your threads and then start a new thread if you have a new question.

Auto Increment column query

I have a very simple table used for debugging:
CREATE TABLE APPS.XX_DEBUG_TMP
TEMP_VALUE VARCHAR2(255 BYTE),
TEMP_DATE   DATE
)Then I can use it to store values as my pl/sql is processed - e.g.:
INSERT INTO XX_DEBUG_TMP (TEMP_VALUE,TEMP_DATE) VALUES ('line 740 l_username value check:' || l_username,SYSDATE); COMMIT;Trouble is that if a load of debug statements get processed with the same timestamp, I can't see which came first.
Can I modify my table creation SQL to include an ID column which just increments for each row that is added to the table?
I'm familiar with how to do it in MySQL (sorry - I know this is an Oracle forum - but am just putting this here to show what I mean):
CREATE TABLE `XX_DEBUG_TMP` (
`TEMP_ID` MEDIUMINT( 10 ) NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`TEMP_VALUE` VARCHAR( 255 ) NOT NULL ,
`TEMP_DATE` DATETIME NOT NULL
) ENGINE = MYISAM ;Is it that simple with Oracle? Probably not!
Any advice much appreciated.
Thanks

There is no auto increment column in Oracle. However, you can create a sequence.
CREATE TABLE APPS.XX_DEBUG_TMP
TEMP_ID     NUMBER NOT NULL PRIMARY KEY,
TEMP_VALUE VARCHAR2(255 BYTE),
TEMP_DATE   DATE
CREATE SEQUENCE APPS.XX_DEBUG_TMP_SEQ;Then in your insert statement do this:
INSERT INTO XX_DEBUG_TMP (TEMP_ID,TEMP_VALUE,TEMP_DATE) VALUES (APPS.XX_DEBUG_TMP_SEQ.NEXTVAL,'line 740 l_username value check:' || l_username,SYSDATE); Another possible solution to your problem would be to use a TIMESTAMP data type instead of a DATE data type. It has fractional second resolution (up to 9 places I believe).

Auto increment pseudo column

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