Count Unique Values

Create Table

-- Create table called adventurers
CREATE TABLE adventurers (
    -- string variable
    name varchar(255),
    -- integer variable
    age int,
    -- string variable
    race varchar(255),
    -- string variable
    weapon varchar(255)
)

Insert Rows

-- Insert into the table adventurers
INSERT INTO adventurers (name, age, race, weapon)
VALUES ('Fjoak Doom-Wife', 28, 'Human', 'Axe'),
       ('Alooneric Cortte', 29, 'Elf', 'Bow'),
       ('Piperel Ramsay', 35, 'Elf', 'Sword'),
       ('Casimir Yardley', 14, 'Elf', 'Magic')

Count Unique Values In Race

-- Count the number of unique values in the race column
SELECT COUNT (DISTINCT race) FROM adventurers
count
2