auto-increment

I start build my first local database (Service-Based Database) here Write line to Service-Based Database with textbox , need your help with setup, so I want to set my auto increment in my Properties Identity Specification which is True now, or use some sorting method, thus if any row is removed, second one (next after deleted) must take index of deleted line, and of course same step back for all subsequent rows, and also important, if I have to use any sorting, to keep original order of lines as it was inserted. For example: line 1 line 2 line 3 line 4 If line2 is deleted this result: line 1

I ran the command as root: set @@auto_increment_offset = 2; But the effect cannot be seen from other connections. Why not? It is global. From http://dev.mysql.com/doc/refman/5.1/en/replication-options-master.html : "If the global value of either variable is set, its effects persist until the global value is changed or overridden by setting the session value, or until mysqld is restarted." That doesn't seem to agree with what I am seeing. Ultimately, I would like to know if there any way to permanently set the offset for all clients without restarting mysqld? As per MySQL documentation you need

I have got a table which has an id (primary key with auto increment), uid (key refering to users id for example) and something else which for my question won’t matter. I want to make, lets call it, different auto-increment keys on id for each uid entry. So, I will add an entry with uid 10, and the id field for this entry will have a 1 because there were no previous entries with a value of 10 in uid . I will add a new one with uid 4 and its id will be 3 because I there were already two entried with uid 4 . ...Very obvious explanation, but I am trying to be as explainative an clear as I can to

i got a function in sql that generate sequential series of alphanumeric no.like (c000,c0001 .......) , which is working good . but when i deleted all data in table , it starts from last generated no. i want it to reset its value from "c0000" . code is as follows :- create table Customers ( dbID int identity not null primary key, CustomerName varchar(100) ) create function CustomerNumber (@id int) returns char(5) as begin return 'C' + right('0000' + convert(varchar(10), @id), 4) end alter table Customers add CustomerNumber as dbo.CustomerNumber(dbID) thanks in advance.... EDIT 1 - how to update

I have a table with bills. Every bill has an id that comes from the DB after I insert a new record. The field is an INTEGER with AUTO_INCREMENT set. If I insert a new record as part of a transaction and I have to rollback this transaction, the ID is taken and gone. So the next record becomes the ID one higher, even though this ID is not in use. It would be better for the bills to have a linear numbering, so the accounting can figure out if something is wrong. For concurrency reasons, the auto increment value cannot "rollback" with your transaction. If another process had inserted records while