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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