Monday, November 26, 2012

Exponential function in SQL

In mathematics, the exponential function is the function ex, where e is the number (approximately 2.718281828) such that the function ex is its own derivative. The exponential function is used to model a relationship in which a constant change in the independent variable gives the same proportional change (i.e. percentage increase or decrease) in the dependent variable. The function is often written as exp(x), especially when it is impractical to write the independent variable as a superscript. The exponential function is widely used in physics, chemistry and mathematics.

When working with mathematical equations in Oracle you will come into contact with this exponential function at one point in time. Using it is quite simple, you can use it by calling the exp function in a way shown below;

SELECT 
      exp(1) AS exp_result 
FROM dual;


EXP_RESULT
----------
2.71828182845904523536028747135266249776 

The above example also shows the precision of exp as it is implemented in the Oracle database.


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