LOG10 (SQL)

A scalar numeric function that returns the base-10 logarithm of a given numeric expression.

Synopsis

{fn LOG10(expression)}

Description

LOG10 returns the base-10 logarithm value of expression. LOG10 returns a value with a precision of 21 and a scale of 18.

LOG10 can only be used as an ODBC scalar function (with the curly brace syntax).

Arguments

expression

A numeric expression.

LOG10 returns either the NUMERIC or DOUBLE data type. If expression is data type DOUBLE, LOG10 returns DOUBLE; otherwise, it returns NUMERIC.

Examples

The following example returns the base-10 logarithm of an integer:

SELECT {fn LOG10(5)} AS Log10

returns .69897000433...

The following Embedded SQL example returns the base-10 logarithm values for the integers 1 through 10:

   SET a=1
   WHILE a<11 {
   &sql(SELECT {fn LOG10(:a)} INTO :b)
   IF SQLCODE'=0 {
     WRITE !,"Error code ",SQLCODE 
     QUIT }
   ELSE {
     WRITE !,"Log-10 of ",a," = ",b
     SET a=a+1 }
   }