Relating a sequence to a table

hi there
i have a table "Employee" for which I have an index column emp_no (Primary Key).
i want to write a sequence for this column, such that it starts at 1 and gets incremented by 1 everytime I insert a row in "Employee"
Any help will be great.
Mahesh.

I have to disagree with you here about the use of variables. There is nothing gained by selecting the sequence value into a variable and then assigning that variable to the :new.column_name.
Offsets? Formatting? I'm not entirely sure what you mean here since the purpose of the sequence is to give you a value - not a value in a certain range. In other words, what's the point of a sequence if you're going to turn around and change the number?
Exception handler? Recording the sequence value? Not sure why an exception factors in here, but anywhere you could use the variable you should instead just use the :new.column_name value.
Naming conventions? For what?
Using the value later in the trigger? Again, just use :new.column_name. Using a variable is totally redundant.
If there is some specific case that you feel warrants a variable, I would really like to hear about it because the reasons you mentioned here just don't necessitate the use of a variable.
I'm pushing back on this because I feel pretty strongly on this issue, but this is just a friendly discussion.

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How to CREATE SEQUENCE in one table

dear all
the one thing i want to know when i use CREATE SEQUENCE in one table like this and then at that table
CREATE SEQUENCE oproduct_sequence
START WITH 1 INCREMENT BY 1
nocache
create table oproduct(
tname varchar2(20) not null,
tid int default oproduct_sequence.nextval
the system indicat that i cannot use this way to create table , so i really want to know how can i achieve this method
becuase when i want to insert inot table oproduct only use
insert into oproduct valuse('aaaa');
and the result like
aaaaa 1
bbbb 2

Actual name is before insert trigger. Some examples are listed below:
Example Number 1 ...
create sequence product_seq start with 1 increment 1
create or replace trigger product_insert before insert for each row begin
select productseq.nextval
into :new.product_id
from dual;
end;
Example Number 2 ...
How to create an autoincrement field in a table with a sequence ...
SQLWKS> create table bob(a number , b varchar2(21));
Statement processed.
First create a sequence
SQLWKS> create sequence x ;
Statement processed.
Then create the trigger.
create trigger y before insert on bob
for each row
when (new.a is null)
begin
select x.nextval into :new.a from dual;
end;
Example Number 3 ...
First create a sequence:
create sequence emp_no_seq;By default it increments by 1 starting at 0.
Use its values when inserting data into the table:
insert into t_emp values (emp_no_seq.nexval, 'Joe Black');~ Madrid.

Count Records in Table Except If Related Record Exists in Child Table

Dear All
I have the following query that counts all of the records in the table SENAlert based upon the teacher's username in a related table.
SELECT COUNT(SENAlert.SENAlertID) AS Expr1
FROM Class INNER JOIN ClassMember ON Class.ClassClassCode = ClassMember.ClassMemberClassCode
INNER JOIN Student ON ClassMember.ClassMemberStudentID = Student.StudentID
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I need to extend this query by adding another table called SENAlertHistory. I would like to count the number of alerts (SENAlertID) for the specified teacher
but where there is no related record in the SENAlertHistory table. Here's what the relationship diagram looks like:
What's going to happen is when a teacher clicks a button to say they have read an alert, I will record this in the SENAlertHistory table. Therefore when performing a count of how many unread alerts the teacher has, I need to ignore the alerts they have
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Try below code
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SELECT COUNT(SENAlert.SENAlertID) AS Expr1
FROM Class INNER JOIN ClassMember ON Class.ClassClassCode = ClassMember.ClassMemberClassCode
INNER JOIN Student ON ClassMember.ClassMemberStudentID = Student.StudentID
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(SELECT * FROM SenAlertHistory SAH WHERE Teacher.TeacherCode = SAH.SenAlertHistoryTeacherCode and SENAlert.SENAlertID = SAH.SEMAlertHistorySENAlertID )
-- If you need the read alert count
SELECT COUNT(SENAlert.SENAlertID) - COUNT(SAH.SEMAlertHistorySENAlertID) AS Expr1,COUNT(SAH.SEMAlertHistorySENAlertID)readalert
FROM Class INNER JOIN ClassMember ON Class.ClassClassCode = ClassMember.ClassMemberClassCode
INNER JOIN Student ON ClassMember.ClassMemberStudentID = Student.StudentID
INNER JOIN SENAlert ON Student.StudentID = SENAlert.SENAlertStudentID
INNER JOIN Teacher ON Class.ClassTeacherCode = Teacher.TeacherCode
LEFT OUTER JOIN SenAlertHistory SAH ON Teacher.TeacherCode = SAH.SenAlertHistoryTeacherCode and SENAlert.SENAlertID = SAH.SEMAlertHistorySENAlertID
WHERE (Teacher.TeacherUsername = 'dsmith')
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J B

Hi Deepesh,
Try the foll. join :
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Hi
I think that you have had your question answered so if you are happy with this can you please award points if you want to but mainly can you please mark your question as answered so that it is easier to navigate around the open questions in the forum as the number of pages are growing and growing and it takes too long to go through everything especially if a satisfactory answer has already been given and people like me who want to help will give up and so some people may not get any help.
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Multiple sequences on one table?

I have a simple table with 3 columns: ID, DML_ID and VALUE. The table was designed to be a metadata table with values for certain DML_IDs. The table has been maintained by IT. However, now the users wants to have control over some of the values. Let's call it User_Maintained values. IT does DML on this table and migrate the change to acceptance and production. At the same time users do DML in production. This causes ID conflict between dev, acc and prod.
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My question here is, is it ok to use 2 sequences on one table? Is it against best practice of Oracle?
Another idea from my co-worker is, use single sequence instead of 2. The sequence will reside in production database and all the 3 databases (dev, acc and prod) will get ID from the same sequence through dblink. Personally I don't like the idea because I don't think getting sequence from production to be used in development is the "best pratice" of Oracle. Although I don't know where I can find the document to support my opinion.
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Sharon

I've discussed with the DBAs and some developers, we all have concern about the idea of one sequence on production being used by all 3 databases (dev, acc and prod). Database clone is one issue. Also making one database (dev or acc) relies on another (production) is not a good approach. Each database should be as independent as possible - only create the linkage when it's necessary. In this case I don't think it's necessary.
I will go with one sequence for user maintained values (in prod), and a manual increase number (max(id) of IT maintained value plus 1) for IT list.
I do all these because the table was a bad design from the first begining so I can't really come up with a correct solution to work around this.
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How to find the sequence for a table.

Hi Everyone,
I've got plenty of sequences. How can I identify that what are the sequences acting on a table?
Regards,
BS2012.

Greg.Spall wrote:
In my last job, we used the table/column comments to point to the sequence.
so:
CREATE SEQUENCE seq_test1;
CREATE TABLE my_table
(id number);
COMMENT ON TABLE my_table IS 'Test table for demonstration purposes on OTN';
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HI Guru's,
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regards
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Foreign keys
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Srini

Dear Srini,
Can any one throw light on Sequencing in Planning Table (MF50)?
Where do we use this?
What are pre requistites?
How is useful?
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Your old & good Forum member
so suggest you to close all your previous threads
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Madhu Kumar

Relation between Eban and Erev tables

Hi,
What is the Relation between Eban and Erev tables?
Thanks and Regards,
Parvatha Reddy

Hi,
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AND
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Santosh

Relation between vbuk and vbup tables?

relation between vbuk and vbup tables?
regards phani

Dear Phani,
http://help.sap.com/saphelp_erp2005/helpdata/en/70/a7853478616434e10000009b38f83b/frameset.htm
VBUK .... Sales Document: Header Status and Administrative Data
VBUP ....Sales Document: Item Status
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Hope this will help.
Regards,
Naveen.

Help-how can i see the sequence in the table?

Hi, i created sequence for the table. but how can i view the sequence as a column in the table? like the sequence started with 1 and increment by 1. how can i make it available as a column in the table? thanks a lot for anyone's prompt reply. much appreciated.

eg.
Create table:
create table t1 (
id number(10),
col1 varchar(2)
Create sequence:
CREATE SEQUENCE "PEMARTEN"."T1_ID" NOCYCLE NOORDER CACHE 20 NOMAXVALUE MINVALUE 1 INCREMENT BY 1 START WITH 1
You can do 2 things:
Use the sequence in your insert query:
eg.
insert into t1 (id, col1) values (t1_id.nextval, 'example');
OR
Create a before insert trigger (prefered):
CREATE OR REPLACE TRIGGER "PEMARTEN"."BI_T1" BEFORE INSERT ON "PEMARTEN"."T1"
REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
DECLARE
new_id number;
BEGIN
SELECT t1_id.nextval
INTO new_id
FROM dual;
:new.id := new_id;
END;
Now you can just insert data:
insert into t1 (col1) values ('example');
sequence.nextval increments the sequence and returns the next value
sequence.currval returns the current value of a sequence
I hope that helps.
Kind regards,
Pieter

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hi
good
use this process to know the details.
Go to SQVI transaction... Create a qucik view.. ztest.. give desc..etc
Select data source as table join.... enter
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mrutyun^

Error while relating sequence to a table

thanks for a quick reply.
i incorporated the suggestions that i got from here and i am getting the following error while i am trying to create a trigger:
ERROR at line 1:
ORA-04089: cannot create triggers on objects owned by SYS
It is pretty self-explanatory but I dont know why I am getting this error. I am connected as sys/change_on_install as SYSDBA
Help please!!
Mahesh

Mahesh,
Hehehe well I had a little chuckle here after reading that. Don't create objects as SYS, that be a bad thing, unless your an elite hax0r.
First make a new user and create that table and trigger and sequence under this new user. The create user syntax is below. It is wise to make a user also that has DBA privs, so you don't need to be connecting as SYS (The syntax below makes a DBA user). This is very helpful if your forget your SYS password (which you really should be changing).
Note that you will have to specify the new user name, password, and in particular the TABLESPACE this new user will be making objects in. I put USR as it, but check to see if you have this tablespace or find one to make objects in, because right now your makeing tables in the SYSTEM table space which is a baaad thing.
DROP USER "U_TYLER";
CREATE USER "U_TYLER" IDENTIFIED BY "MY_PASSWORD_HERE"
DEFAULT TABLESPACE "USR"
TEMPORARY TABLESPACE "TEMP"
PROFILE DEFAULT ACCOUNT UNLOCK;
GRANT "CONNECT" TO "U_TYLER";
GRANT "RESOURCE" TO "U_TYLER";
GRANT "DBA" TO "U_TYLER";
ALTER USER "STB" DEFAULT ROLE ALL;
GRANT CREATE SYNONYM TO U_TYLER;
GRANT DROP PUBLIC SYNONYM TO U_TYLER;
GRANT CREATE PUBLIC SYNONYM TO U_TYLER;
Reply back if your still having some troubles, cause we love to help people worldwide :).
Tyler

Relating a sequence to a table

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