https://dba.stackexchange.com › questions › 316026
Difference between PRIMARY KEY and SERIAL (with index)You need a primary key or unique constraint as the target of a foreign key constraint. Indexes are not part of the SQL standard, but constraints are.
https://stackoverflow.com › questions › 55300370
PostgreSQL: serial vs identity - Stack OverflowBetter to use SERIAL PRIMARY KEY or GENERATED ALWAYS AS IDENTITY for primary key in PostgreSQL
https://www.postgresqltutorial.com › postgresql-tutorial › postgresql-serial
Using PostgreSQL SERIAL to Create Auto-increment ColumnsIt is important to note that the SERIAL does not implicitly create an index on the column or make the column the primary key column. However, this can be done easily by specifying the PRIMARY KEY constraint for the SERIAL column.
Vidéos
https://sql.sh › cours › create-table › primary-key
SQL PRIMARY KEYDans le langage SQL la “PRIMARY KEY”, autrement la clé primaire, permet d’identifier chaque enregistrement dans une table de base de données. Chaque enregistrement de cette clé primaire doit être UNIQUE et ne doit pas contenir de valeur NULL.
https://www.cybertec-postgresql.com › en › uuid-serial-or-identity-columns-for-postgresql...
Auto-generated primary keys: UUID, serial or identity column? - CYBERTECNumbers generated by a sequence and UUIDs are both useful as auto-generated primary keys. Use identity columns unless you need to generate primary keys outside a single database, and make sure all your primary key columns are of type bigint.
https://www.w3schools.com › sql › sql_primarykey.ASP
SQL PRIMARY KEY Constraint - W3SchoolsThe PRIMARY KEY constraint uniquely identifies each record in a table. Primary keys must contain UNIQUE values, and cannot contain NULL values. A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).
https://www.freecodecamp.org › news › primary-key-sql-tutorial-how-to-define-a-primary-key...
Primary Key SQL Tutorial – How to Define a Primary Key in a DatabaseThis is a Composite Key. Now let's try defining Primary Keys with real code examples. There's two things to do here: first, you'll identify the Primary Key. Then, you'll learn the syntax for defining it in a database.
https://www.atlassian.com › data › admin › how-to-define-an-auto-increment-primary-key-in...
Defining Auto Increment Primary Keys in SQL Server - AtlassianBy simply setting our id column as SERIAL with PRIMARY KEY attached, Postgres will handle all the complicated behind-the-scenes work and automatically increment our id column with a unique, primary key value for every INSERT.
https://www.postgresqltutorial.com › postgresql-tutorial › postgresql-primary-key
PostgreSQL Primary Key - PostgreSQL TutorialIn this tutorial, we will show you what is the primary key is and how to manage PostgreSQL primary key constraints through SQL statements.
https://learnsql.com › blog › primary-key-sql
What is a Primary Key in SQL? - LearnSQL.comIn this article, I went over what a primary key is, the main purposes of primary keys, the different types of primary keys, and the syntax for creating primary keys in SQL. There is another concept in SQL where primary keys play an important role: foreign keys.
