A key is a set of attributes that is irreducibly unique and non-nullable within a table.
SQL Server 2008: DECLARE @MyTable TABLE( PersonID INT NOT NULL, Person2ID INT NOT NULL, Description NVARCHAR(100), CONSTRAINT PK PRIMARY KEY …
sql-server-2008 variables primary-keyHow to provide primary key for multiple column in a single table using PostgreSQL? Example: Create table "Test" ( "SlNo" int …
postgresql database-design primary-key ddl composite-primary-keyI have been working on an offline version of my Django web app and have frequently deleted model instances for …
django primary-key models instancesIs it bad to have text as a primary key in an SQLite database? I heard that it's bad for …
android database sqlite primary-key rowidCurrently we're using INT(21)* for all autoincrement id columns in out 30+ table database. We are a blogging site, and have …
mysql primary-key auto-incrementIn the databases course that I did during my education (approx. 4 years ago), I thought that it is recommended avoiding …
sql foreign-keys primary-key postgresql-9.1 sqldatatypesWhen I try to run the following code in Rails using Mysql2 as database manager: rake db:migrate I obtain …
mysql ruby-on-rails primary-key mysql2I have a table that stores some extra data for some rows of a table like: public class QuoteExtra { [Key] …
ef-code-first primary-key entity-framework-5 entity-framework-migrationsI was told by a friend: What unique key do you use? I hope you are not saving the entire …
mysql database-design primary-key unique-keyI am using NAVICAT to make tables for MYSQL and I am unable to find the auto-increment attribute option for …
mysql primary-key increment navicat