AVG() :
This function in SQL Server is used to return the average value of the specified expression.
Features :
- This function is used to find the average value of the specified expression.
- This function comes under Numeric Functions.
- This function accepts only one parameter, namely expression.
- This function ignores NULL values.
Syntax :
AVG(expression)
Parameter :
This method accepts one parameter.
- expression – A specified numeric value may be either a stated field or a stated formula.
Returns :
It returns the average value of the specified expression.
Example-1 :
Using AVG() function and getting the output.
CREATE TABLE product ( user_id int IDENTITY(100, 2) NOT NULL, product_1 VARCHAR(10), product_2 VARCHAR(10), price int ); INSERT product(product_1, price) VALUES ('rice', 400); INSERT product(product_2, price) VALUES ('grains', 600); SELECT AVG(price) FROM product;
Output :
500
Here, the average of the first product’s price and second product’s price is returned.
Example-2 :
Using AVG() function and getting the average of float values.
CREATE TABLE floats ( user_id int IDENTITY(100, 2) NOT NULL, float_val float ); INSERT floats(float_val) VALUES (3.5); INSERT floats(float_val) VALUES (2.5); SELECT AVG(float_val) FROM floats;
Output :
3
Example-3 :
Using AVG() function and getting the output where MRP is greater than the average MRP of the products.
CREATE TABLE package ( user_id int IDENTITY(100, 4) NOT NULL, item VARCHAR(10), mrp int ); INSERT package(item, mrp) VALUES ('book1', 250); INSERT package(item, mrp) VALUES ('book2', 350); INSERT package(item, mrp) VALUES ('book3', 400); SELECT * FROM package WHERE mrp > (SELECT AVG(mrp) FROM package);
Output :
| user_id | item | mrp -------------------------------- 1 | 104 | book2 | 350 -------------------------------- 2 | 108 | book3 | 400
Example-4 :
Using AVG() function and getting the average of the (MRP-sales price).
CREATE TABLE package ( user_id int IDENTITY(100, 4) NOT NULL, item VARCHAR(10), mrp int, sp int ); INSERT package(item, mrp, sp) VALUES ('book1', 250, 240); INSERT package(item, mrp, sp) VALUES ('book2', 350, 320); INSERT package(item, mrp, sp) VALUES ('book3', 400, 350); SELECT AVG(mrp-sp) FROM package;
Output :
30
Application :
This function is used to find the average of the expression specified.