Unique and not null column : Unique « Constraints « PostgreSQL

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PostgreSQL » Constraints » 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

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