auto-increment

I am using SQL Server 2008 and a primary key of a database table I am using is not an IDENTITY column (not sure why). I need to change that. I am in SQL Server Management Studio in design view, under column properties and for some reason I can't change the identity specifications to Yes . Is there something that I am missing.. I am new to SQL Server - any ideas on what I am missing?? Here is the create table CREATE TABLE [dbo].[AR_Transactions]( [Trans_ID] [bigint] NOT NULL, [DateTime] [datetime] NOT NULL, [Cashier_ID] [nvarchar](50) NULL, [CustNum] [nvarchar](12) NOT NULL, [Trans_Type]

All the documentation I read about reseeding suggests something along the lines of: SET @maxIdentityValue = (SELECT MAX(id) FROM tablename) run DBCC CHECKIDENT('tablename', RESEED, @maxIdentityValue) And yet it appears to me that a simple DBCC CHECKIDENT('tablename', RESEED) is all that's needed, and it will automatically determine the correct identity value from the table without supplying a max value. Is there a reason (performance or otherwise) that extracting the value using MAX first is preferred? Piggyback question: the reason I need to reseed is because I'm using replication and

In a RoR migration, how do I auto increment a non-primary-key field? I'd like to do this in the db definition, and not in the model. user386660 You need to execute an SQL statement. statement = "ALTER TABLE `users` CHANGE `id` `id` SMALLINT( 5 ) UNSIGNED NOT NULL AUTO_INCREMENT" ActiveRecord::Base.connection.execute(statement) you can entry manually in your migration Note this is just an example. The final SQL statement syntax depends on the database. 来源： https://stackoverflow.com/questions/3220473/auto-increment-a-non-primary-key-field-in-ruby-on-rails

I have a table with a SERIAL primary key, and also an ltree column, whose value I want to be the concatenation of those primary keys. e.g. id | path ---------- 1 1 2 1.2 3 1.2.3 4 1.4 5 1.5 I'm curious if there's a way to do such an insert in one query, e.g. INSERT INTO foo (id, ltree) VALUES (DEFAULT, THIS.id::text) I'm probably overreaching here and trying to do in one query what I should be doing in two (grouped in a transaction). You could use a subquery or a writable CTE to retrieve the value from the sequence once and use it repeatedly : WITH i AS ( SELECT nextval('foo_id_seq') AS id )

for example i have about 500 lines. in the beginning of each line i want to add a number. so in line 1 i would want "1)" and then line 2 i would want "2)" i know i can do a macro in n++, but it wouldn't be incremental. is there any possible way to do this? Notepad++ Macros only playback keyboard actions. They can't do anything dynamic. However there is a built-in(?) plugin that can do this for you. Highlight all the code, then choose "TextFX / TextFX Tools / Insert Line Numbers" One thing to be aware of is that it is the absolute line number within the file. You can't start numbering on line