Oracle PL/SQL/Numeric Math Functions/LN
LN: Returns natural logs, that is, logs with respect to base e
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SQL> SQL> -- create demo table SQL> create table TestTable(
2 ID VARCHAR2(4 BYTE) NOT NULL, 3 MyName VARCHAR2(10 BYTE), 4 MyDate DATE, 5 MyNumber Number(8,2) 6 ) 7 /
Table created. SQL> SQL> SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19960711","YYYYMMDD"),12.12); 1 row created. SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19970622","YYYYMMDD"),2.12); 1 row created. SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19980513","YYYYMMDD"),22.1); 1 row created. SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19990624","YYYYMMDD"),2.12); 1 row created. SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("20000415","YYYYMMDD"),2.1); 1 row created. SQL> SQL> SQL> select * from TestTable
2
SQL> SQL> SQL> --LN: Returns natural logs, that is, logs with respect to base e. SQL> SELECT LN(MyNumber) FROM TestTable; LN(MYNUMBER)
2.49485698 .751416089 3.09557761 .751416089 .741937345
SQL> SQL> SQL> SQL> SQL> drop table TestTable;
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LN(x):Returns the natural logarithm of x
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SQL> -- SQL> SQL> --LN(x):Returns the natural logarithm of x. SQL> SQL> select LN(2.71828183) from dual; LN(2.71828183)
1
SQL>
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