SQL EXP Function

The SQL EXP function is one of the SQL Mathematical function which is used to return E raised to the power of the given float value, Where E is Euler’s number and it is approximately equal to 2.71828. For example if we specify the expression as, EXP (2). It means e² ==> 2.718² ==> 7.38. In this article we will show you, How to use/write SQL Server EXP function with example.

SQL EXP Function Syntax

The basic syntax of the SQL Server EXP Function is as shown below:

SELECT EXP (Float_Expression)
FROM [Source]

SQL EXP Function Example 1

The SQL server EXP Function is used to calculate the power of Euler’s number E. In this example, We are going to check the same with different data (both positive and negative values) and display the output

T-SQL CODE

DECLARE @i float
SET @i = 2

SELECT EXP(@i)AS [Exponent Result 1]

-- Calculating Exp directly
SELECT EXP(1) AS [Exponent Result 2]

SELECT EXP(62.9876) AS [Exponent Result 3]

SELECT EXP(108.65 + 231.1237 - 213.32 + 15.09) AS [Exponent Result 4]

-- Calculating Exp for Negative Values
SELECT EXP(-1) AS [Exponent Result 5]
SELECT EXP(-6.579) AS [Exponent Result 6]

OUTPUT

ANALYSIS

Below lines of code is used to declare float variable and assigning the random value.

DECLARE @i float
SET @i = 2

Next, we are calculating the exponential value of @i. We also assigned new name to the result as ‘Exponent Result 1’ using SQL ALIAS Column.

SELECT EXP(@i)AS [Exponent Result 1]

In the below statement, We used EXP function directly on the positive float values. Here, EXP(1) means e¹ ==> 2.718¹ ==> 2.718

SELECT EXP(1) AS [Exponent Result 2]
SELECT EXP(62.9876) AS [Exponent Result 3]
SELECT EXP(108.65 + 231.1237 - 213.32 + 15.09) AS [Exponent Result 4]

Next, We used EXP function directly on the negative float values

SELECT EXP(-1) AS [Exponent Result 5]
SELECT EXP(-6.579) AS [Exponent Result 6]

SQL EXP Function Example 2

In this example, We are going to calculate the E raised to the power of the all the records present in the [Tax Amount] column using EXP Function.

T-SQL CODE

SELECT [EnglishProductName]
      ,[Color]
      ,[StandardCost]
      ,[ListPrice]
      ,[DealerPrice]
      ,[SalesAmount]
      ,[TaxAmt]
      ,EXP([TaxAmt]) AS [Tax_Exponent result]
  FROM [SQL Tutorial].[dbo].[Prod Sales]

OUTPUT

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