Unique and not null column : Unique « Constraints « PostgreSQL






  1. PostgreSQL
  2. Constraints
  3. Unique

Unique and not null column


postgres=#
postgres=# CREATE TABLE products (
postgres(#    product_no integer UNIQUE NOT NULL,
postgres(#    name text,
postgres(#    price numeric
postgres(# );
NOTICE:  CREATE TABLE / UNIQUE will create implicit index "products_product_no_key" for table "products"
CREATE TABLE
postgres=#
postgres=# drop table products;
DROP TABLE
postgres=#
postgres=#








Related examples in the same category

1.Unique Constraints
2.Specifying the unique column using Unique function
3.Unique constraint refers to a group of columns, the columns are listed separated by commas
4.Assign your own name for a unique constraint