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PostgreSQL - select first N rows
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In this article, we would like to show you how to find and select the first row from a table in PostgreSQL.
Quick solution:
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SELECT "column1", "column2", "columnN"2
FROM "table_name"3
LIMIT N;To show how to select the first N rows from a table, 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 select all the information (columns) about the first 3 users from the users table.
Query:
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SELECT *2
FROM "users"3
LIMIT 3;Output:
In this example, we will find the first 3 users id, name and email column information.
Query:
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SELECT "id", "name", "email"2
FROM "users"3
LIMIT 3;Output:
In this example, we will select the first row in some order.
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SELECT *2
FROM "users"3
ORDER BY "name"4
LIMIT 3;Output:
create_tables.sql file:
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CREATE TABLE "users" (2
"id" SERIAL PRIMARY KEY,3
"name" VARCHAR(100) NOT NULL,4
"email" VARCHAR(100) NOT NULL,5
"country" VARCHAR(15) NOT NULL6
);insert_data.sql file:
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INSERT INTO "users"2
("name", "email", "country")3
VALUES4
('Tom', 'tom@email.com', 'Poland'),5
('Chris', 'chris@email.com', 'Spain'),6
('Jack', 'jack@email.com', 'Spain'),7
('Kim', 'kim@email.com', 'Vietnam'),8
('Marco', 'marco@email.com', 'Italy'),9
('Kate', 'kate@email.com', 'Spain'),10
('Nam', 'nam@email.com', 'Vietnam');