The EXP function implements the exponential function for a numeric expression, or the base of the natural logarithm, e, raised to the power of expression.
The EXP function is the inverse of LN function.
Syntax
EXP(expression)
Argument
- expression
-
The expression must be an
INTEGER,DECIMAL, orDOUBLE PRECISIONdata type.
Return type
DOUBLE PRECISION
Example
The following example uses the TICKIT sample database. For more information, see Sample database.
Use the EXP 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 EXP 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) * EXP((7::FLOAT/100)*10) qty2018;
+-------------------+
| qty2018 |
+-------------------+
| 695447.4837722216 |
+-------------------+