PostgreSQL Create Table: Create a table to allow one of the columns of a table to contain only an auto-incremented value
11. Write a SQL statement to create a table countries including columns country_id, country_name and region_id and make sure that the column country_id will be unique and store an auto-incremented value.
CREATE TABLE IF NOT EXISTS countries ( COUNTRY_ID SERIAL PRIMARY KEY, COUNTRY_NAME varchar(40) NOT NULL, REGION_ID decimal(10,0) NOT NULL );
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