auto-increment

I was just creating a new table using MySQL Query Browser, and noticed there's a tick under Auto Increment Column. How does that work? When adding to the database programatically, do I just add a number, and then the database automatically increments that number? Everytime a NEW user registers on my site, I want their Customer ID (integer only) to auto increment, so I don't have to try and randomly generate a unique number. Can this be done simply? Thank you! When adding to the database programatically, do I just add a number, and then the database automatically increments that number? Yes,

I've got a strange situation with some tables in my database starting its IDs from 0, even though TABLE CREATE has IDENTITY(1,1). This is so for some tables, but not for others. It has worked until today. I've tried resetting identity column: DBCC CHECKIDENT (SyncSession, reseed, 0); But new records start with 0. I have tried doing this for all tables, but some still start from 0 and some from 1. Any pointers? (i'm using SQL Server Express 2005 with Advanced Services) From DBCC CHECKIDENT DBCC CHECKIDENT ( table_name, RESEED, new_reseed_value ) If no rows have been inserted to the table since

Is it possible to have a non-primary key to be auto-incremented with every insertion? For example, I want to have a log, where every log entry has a primary key (for internal use), and a revision number ( a INT value that I want to be auto-incremented). As a workaround, this could be done with a sequence, yet I believe that sequences are not supported in SQLite. Icarus You can do select max(id)+1 when you do the insertion. For example: INSERT INTO Log (id, rev_no, description) VALUES ((SELECT MAX(id) + 1 FROM log), 'rev_Id', 'some description') Note that this will fail on an empty table since

I have the following problem, I want to have Composite Primary Key like: PRIMARY KEY (`base`, `id`); for which when I insert a base the id to be auto-incremented based on the previous id for the same base Example: base id A 1 A 2 B 1 C 1 Is there a way when I say: INSERT INTO table(base) VALUES ('A') to insert a new record with id 3 because that is the next id for base 'A'? The resulting table should be: base id A 1 A 2 B 1 C 1 A 3 Is it possible to do it on the DB exactly since if done programmatically it could cause racing conditions. EDIT The base currently represents a company, the id

I have a basic table with columns: id (primary with AI) name (unique) etc If the unique column doesn't exist, INSERT the row, otherwise UPDATE the row.... INSERT INTO pages (name, etc) VALUES 'bob', 'randomness' ON DUPLICATE KEY UPDATE name = VALUES(name), etc = VALUES(etc) The problem is that if it performs an UPDATE, the auto_increment value on the id column goes up. So if a whole bunch of UPDATES are performed, the id auto_increment goes through the roof. Apparently it was a bug: http://bugs.mysql.com/bug.php?id=28781 ...but I'm using InnoDB on mySQL 5.5.8 on shared hosting. Other people