Add a column if it doesn't exist to all tables?

Question

I\'m using SQL Server 2005/2008. I need to add a column to a table if it does not yet exist. This will apply to all tables in a given database. I hoped I was close, but I\'m h

Answer 1

You cannot use variables, like @tableName, in DDL. Besides, splinting the name into part and ignoring the schema can only result in bugs. You should just use the ''?'' replacement in the SQL batch parameter and rely on the MSforeachtable replacement:

EXEC sp_MSforeachtable '
if not exists (select * from sys.columns 
               where object_id = object_id(''?'')
               and name = ''CreatedOn'') 
begin
    ALTER TABLE ? ADD CreatedOn datetime NOT NULL DEFAULT getdate();
end';