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DEXP function

The DEXP function returns the exponential value in scientific notation for a double precision number. The only difference between the DEXP and EXP functions is that the parameter for DEXP must be a DOUBLE PRECISION.

Syntax

DEXP(number)

Argument

Return type

DOUBLE PRECISION

Example

The following example uses the TICKIT sample database. For more information, see Sample database.

Use the DEXP function to forecast ticket sales based on a continuous growth pattern. In this example, the subquery returns the number of tickets sold in 2008. That result is multiplied by the result of the DEXP function, which specifies a continuous growth rate of 7% over 10 years.

SELECT (SELECT SUM(qtysold) 
FROM sales, date
WHERE sales.dateid=date.dateid
AND year=2008) * DEXP((7::FLOAT/100)*10) qty2010;

+-------------------+
|      qty2010      |
+-------------------+
| 695447.4837722216 |
+-------------------+