AVG() Function in MySQL
Last Updated :
21 Jan, 2021
AVG() function :
This function in MySQL 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 only one parameter as follows.
- expression –The 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.
Creating table –
CREATE TABLE item13
(
user_id int,
product01 VARCHAR(4),
product02 VARCHAR(10),
price int
);
Inserting data –
INSERT item13(product01, price)
VALUES ('rice', 500);
INSERT item13(product02, price)
VALUES ('grains', 700);
Reading Data –
SELECT AVG(price) FROM item13;
Output :
600
Here, the average of the first product’s price and the second product’s price is returned.
Example-2 :
Using AVG() function and getting the average of float values.
Creating table –
CREATE TABLE floats
(
user_id int,
float_val float
);
Inserting Data –
INSERT floats(float_val)
VALUES (3.5);
INSERT floats(float_val)
VALUES (2.5);
Reading Data –
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.
Creating table –
CREATE TABLE package01
(
user_id int NOT NULL AUTO_INCREMENT,
item VARCHAR(10),
mrp int,
PRIMARY KEY(user_id)
);
Inserting Data –
INSERT package01(item, mrp)
VALUES ('book1', 250);
INSERT package01(item, mrp)
VALUES ('book2', 350);
INSERT package01(item, mrp)
VALUES ('book3', 400);
Reading Data –
SELECT * FROM package01
WHERE mrp > (SELECT AVG(mrp) FROM package01);
Output :
user_id |
item |
mrp |
2 |
book2 |
350 |
3 |
book3 |
400 |
Example-4 :
Using AVG() function and getting the average of the (MRP-sales price).
Creating table –
CREATE TABLE package011
(
user_id int NOT NULL AUTO_INCREMENT,
item VARCHAR(10) NOT NULL,
mrp int NOT NULL,
sp int NOT NULL,
PRIMARY KEY(user_id)
);
Inserting Data –
INSERT package011(item, mrp, sp)
VALUES ('book1', 250, 240);
INSERT package011(item, mrp, sp)
VALUES ('book2', 350, 320);
INSERT package011(item, mrp, sp)
VALUES ('book3', 400, 350);
Reading Data –
SELECT AVG(mrp-sp) FROM package011;
Output :
30
Application :
This function is used to find the average of the expression specified.
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