A key is a set of attributes that is irreducibly unique and non-nullable within a table.
I was watching a screencast where the author said it is not good to have a primary key on a …
ruby-on-rails database migration primary-key junction-tableI have a MySQL database with a MyISAM table with 4 million rows. I update this table about once a week …
mysql primary-key alterI have a table TestTable with columns ID as binary(16) and name as varchar(50) I've been trying to store an …
java mysql primary-key uuid sql2oI'm creating a simple form that stores entered data in an extremely simple Oracle database table via a Java Servlet …
oracle jdbc primary-key constraints ora-00001In SQL Server 2005 I am inserting a row into a table using a stored procedure and I want to fetch …
sql-server-2005 stored-procedures primary-key insert-updateWhat is the limit of the length of primary key column? I'm going to use varchar as primary key. I've …
postgresql primary-key varcharI would like to see an example of: When this is appropriate When this is not appropriate Is there a …
sql primary-key composite-primary-keyI have a list of items. Most of these items will not be in stock. The item table has id, …
sql key primary-key composite-key composite-primary-keyI have a really huge table, with ~200 million rows. It had no index/pk at all. Selects in this table …
oracle indexing primary-key composite-primary-keyI would like to create a bigint (or string or whatever that is not int) typed primary key field under …
ruby-on-rails ruby-on-rails-3 primary-key bigint