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MS SQL Server - average value for grouped rows
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In this article, we would like to show you how to find avg value for grouped rows in MS SQL Server.
Quick solution:
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SELECT [column1], AVG([column2])2
FROM [table_name]3
GROUP BY [column1];To show how to find avg value for grouped rows, 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 average salary value for each department.
Query:
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SELECT department_id, AVG(salary) AS 'avg_salary'2
FROM [users]3
GROUP BY [department_id];Result:
create_tables.sql file:
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CREATE TABLE [users] (2
[id] INT IDENTITY(1,1),3
[name] VARCHAR(50) NOT NULL,4
[surname] VARCHAR(50) NOT NULL,5
[email] VARCHAR(100),6
[department_id] INT,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');