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 power
SQUARE(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.

Cet exercice fait partie du cours

Functions for Manipulating Data in SQL Server

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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.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de 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;

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