A key is a set of attributes that is irreducibly unique and non-nullable within a table.
I'm on the cusp of starting work on a new webapp. Part of this will give users pages that they …
django url django-models primary-keyI have a table in SQL Server 2005 containing 10000054 records; these records are inserted through a bulk insert operation. The table …
sql-server primary-key bulkinsertI have two tables with a many to many relationship that I am using has_and_belongs_to_many to …
ruby-on-rails join primary-key has-and-belongs-to-manyThis is one strange, unwanted behavior I encountered in Postgres: When I create a Postgres table with composite primary keys, …
postgresql database-design null unique primary-keyI have two already-existing tables which look (in part) roughly like this: CREATE TABLE parent ( old_pk CHAR(8) NOT NULL …
mysql foreign-keys primary-key constraints mysql-error-1025I have 3 tables: dentists, groups, and groupdentlink. Many dentists link to many groups through the groupdentlink table. So I'm trying …
mysql primary-key overwriteIt could be kind of lame but in cassandra has the primary key to be unique? For example in the …
cassandra primary-key create-tableMy version of rails is 4.0.0, my version of mysql is Ver 14.14 Distrib 5.7.9, for Win64 (x86_64). I am operating of an …
mysql ruby-on-rails rake primary-key dbmigrateI am inserting many records using JDBC batch inserts. Is there any way to get the generated key for each …
java oracle jdbc primary-key batch-insertI am working on the design of a database that will be used to store data that originates from a …
sql database primary-key composite