AVG() Function in MySQL
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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