LOG10() Function in MySQL

LOG10() function in MySQL is used to calculate the natural logarithm of a specific number with base 10. The number must be greater than 0, otherwise it will return NULL.

Syntax :

LOG10(X)

Parameter : This method accepts one parameter as mentioned above in the syntax and described below :

• X – A number whose logarithm value with base 10 we want to calculate. It should be positive number.

Returns : It returns the natural logarithm of given number x with base 10.

Example-1 :
The logarithm of the given number with base 10 using the LOG10() function.

SELECT LOG10(1000) AS Log10_Val ;

Output :

Log10_Val
3

Example-2 :
The logarithm of 0 using LOG10() function.

SELECT LOG10(0) AS Log10_Val ;

Output :

Log10_Val
NULL

Example-3 :
The LOG10 function can also be used to find the logarithmic value with base 10 of a column data. To demonstrate create a table named Product.

CREATE TABLE Product(
Product_id INT AUTO_INCREMENT,  
Product_name VARCHAR(100) NOT NULL,
Buying_price DECIMAL(13, 2) NOT NULL,
Selling_price DECIMAL(13, 2) NOT NULL,
Service_grade Decimal(6, 2) NOT NULL,
PRIMARY KEY(Product_id)
);

Now inserting some data to the Product table –

INSERT INTO  
Product(Product_name, Buying_price, Selling_price, Service_grade)
VALUES
('Touring Bike', 2019.00, 3009.6, 5.89 ),
('Mountain Bike', 3019.50, 4000.56, 10.00 ),
('Road Bike', 1019.20, 2000.56, -0.89 ),
('Road Bicycle', 1419.50, 1800.56, -1.50 ),
('Racing Bicycle', 3000.50, 4500.56, 5.00) ;

Showing all data in Product Table –

Select * from Product;

PRODUCT_ID	PRODUCT_NAME	BUYING_PRICE	SELLING_PRICE	SERVICE_GRADE
1	Touring Bike	2019.00	3009.6	5.89
2	Mountain Bike	3019.50	4000.56	10.00
3	Road Bike	1019.20	2000.56	-0.89
4	Road Bicycle	1419.50	1800.56	-1.50
5	Racing Bicycle	3000.50	4500.56	5.00

Now, we are going to find the logarithmic values with base 10 for all the records present in the Service_grade column.

Select Product_id, Product_name, Buying_price, 
Selling_price, Service_grade,
LOG10(Service_grade) AS GRADELOG10  
FROM Product;

Output :

PRODUCT_ID	PRODUCT_NAME	BUYING_PRICE	SELLING_PRICE	SERVICE_GRADE	GRADELOG10
1	Touring Bike	2019.00	3009.6	5.89	0.7701152947871016
2	Mountain Bike	3019.50	4000.56	10.00	1
3	Road Bike	1019.20	2000.56	-0.89	NULL
4	Road Bicycle	1419.50	1800.56	-1.50	NULL
5	Racing Bicycle	3000.50	4500.56	5.00	0.6989700043360189