DEXP function - Amazon Redshift
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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.





The input parameter is a DOUBLE PRECISION number.

Return type



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 | +-------------------+