Working with exponential functions
The exponential functions are useful when you need to perform calculations in the database. For databases storing real estate information, for example, you may need to calculate areas. In this case, these functions may come in handy:
POWER(number, power)
: raises the number to the specified powerSQUARE(number)
: raises the number to the power of 2
Or, if you need to calculate the distance between two cities, whose coordinates are known, you could use this function:
SQRT(number)
: calculates the square root of a positive number.
In this exercise, you will play with the exponential functions and analyze the values they return.
This exercise is part of the course
Functions for Manipulating Data in SQL Server
Exercise instructions
- Raise the number stored in the
@number
variable to the power from the@power
variable. - Calculate the square of the
@number
variable (square means the power of 2). - Calculate the square root of the number stored in the
@number
variable.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
DECLARE @number DECIMAL(4, 2) = 4.5;
DECLARE @power INT = 4;
SELECT
@number AS number,
@power AS power,
-- Raise the @number to the @power
___ AS number_to_power,
-- Calculate the square of the @number
___ num_squared,
-- Calculate the square root of the @number
___ num_square_root;