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PostgreSQL - select rows with max value of column
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In this article, we would like to show you how to select rows with the max value of a column in PostgreSQL.
Quick solution
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SELECT "column1", MAX("column2")2
FROM "table_name"3
GROUP BY "column1";To show how to select rows with the max value of a column, 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 the maximum salary value for each department.
Query:
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SELECT "department_id", MAX("salary")2
FROM "users"3
GROUP BY "department_id";Result:
create_tables.sql file:
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CREATE TABLE "users" (2
"id" SERIAL,3
"name" VARCHAR(50) NOT NULL,4
"surname" VARCHAR(50) NOT NULL,5
"email" VARCHAR(100),6
"department_id" INTEGER,7
"salary" DECIMAL(15,2) NOT NULL,8
PRIMARY KEY ("id")9
);insert_data.sql file:
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INSERT INTO "users"2
( "name", "surname", "email", "department_id", "salary")3
VALUES4
('John', 'Stewart', 'john@email.com', 1, '3512.00'),5
('Chris', 'Brown', 'chris@email.com', 2, '1344.00'),6
('Kate', 'Lewis', NULL, 3, '6574.00'),7
('Ailisa', 'Gomez', 'ailisa@email.com', 3, '6500.00'),8
('Gwendolyn', 'James', NULL, 2, '4200.00'),9
('Simon', 'Collins', NULL, 1, '3320.00'),10
('Taylor', 'Martin', NULL, 2, '1500.00'),11
('Andrew', 'Thompson', 'andrew@email.com', 1, '2100.00');