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PostgreSQL - SELECT DISTINCT statement
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In this article, we would like to show you how to use SELECT DISTINCT statement in PostgreSQL.
Quick solution:
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SELECT DISTINCT "column1", "column2", "columnN"2
FROM "table_name";To show how the SELECT DISTINCT statement works, we will use the following table:
Note:
At the end of this article you can find database preparation SQL queries.
In this example, we will display unique countries from the users table.
Query:
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SELECT DISTINCT "country"2
FROM "users";Output:
create_tables.sql file:
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CREATE TABLE "users" (2
"id" SERIAL PRIMARY KEY,3
"name" VARCHAR(100) NOT NULL,4
"country" VARCHAR(15) NOT NULL5
); insert_data.sql file:
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INSERT INTO "users"2
("name", "country")3
VALUES4
('Tom', 'Poland'),5
('Chris', 'Belgium'),6
('Jack', 'Belgium'),7
('Kate', 'Algeria'),8
('Denis', 'Germany'),9
('Matt', 'Germany');