Can we specify prefix for an auto increment column

Hi all,
I want to create an auto increment column in oracle using oracle sequences.
But i want to specify a prefix for the value appearing after increment.
Prefix will remain constant.
If we can how can i do that.
And one more thing is i will call the sequence using a trigger only for a specified condition.My doubt here is can i allow nulls for auto incrementing column
With Regards

<s></s>
-- Samples.
create table tab1
(id varchar2(6) constraint p_tab1 primary key
,data varchar2(255)
create sequence seq_tab1;
create or replace
trigger trg_tab1
before insert on tab1
for each row
declare
p_prefix varchar2(2) := 'AA';
begin
if (:new.id is null) then
select p_prefix||to_char(seq_tab1.nextval,'fm0009') into :new.id from dual;
end if;
end
-- Test
SQL> insert into tab1(data) values('abc');
1 row created.
SQL> insert into tab1(id,data) values('BB9999','xyz');
1 row created.
SQL> select * from tab1;
ID
DATA
AA0001
abc
BB9999
xyz

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Auto Increment column query

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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):
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What does the setting "auto increment column templates"

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Version 3.0.
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this is my query.
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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.
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id number not null,
name varchar2(30)
alter table example
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user13566109 wrote:
Thanks All,
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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.

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Hi,
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Take care.

How can I automatically increment an auto incremented column?

Hello!
I have a table with an auto incremented "id" field.
It looks like this:
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I would like to make an insertion like:
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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)
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If I use PHPMyAdmin to insert a new row, then this query works:
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I have tried this (but got the error that the "Field 'id' doesn't have a default value"):
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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.
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Auto-increment column increase performance in this case ?

hi.
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null

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lisavs12686 wrote:
Whould it also be possible to send the sender the submited data (looking like the filled in form or so)?
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Hi Tam,
How did you set the workflow to assign an auto-increment column to a list?
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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
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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

Can we specify prefix for an auto increment column

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