Oracle PL/SQL Tutorial/Numerical Math Functions/LN

select ln(32)

SQL>
SQL>
SQL>
SQL> select ln(32)
  2  from   dual;
    LN(32)
----------
 3.4657359
SQL>
SQL>

SIN(30*3.14159ANH(EXP(4) LOG(LN(32)

SQL>
SQL>
SQL> select sin(30*3.14159265/180), tanh(0.5)
  2  ,      exp(4), log(2,32), ln(32)
  3  from   dual;
SIN(30*3.14159265/180)  TANH(0.5)     EXP(4)  LOG(2,32)     LN(32)
---------------------- ---------- ---------- ---------- ----------
            .499999999 .462117157   54.59815          5  3.4657359
SQL>

Using the LN function

SQL> -- create demo table
SQL> create table myTable(
  2    id           NUMBER(2),
  3    value        NUMBER(6,2)
  4  )
  5  /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into myTable(ID,  value)values (1,9)
  2  /
1 row created.
SQL> insert into myTable(ID,  value)values (2,2.11)
  2  /
1 row created.
SQL> insert into myTable(ID,  value)values (3,3.44)
  2  /
1 row created.
SQL> insert into myTable(ID,  value)values (5,10)
  2  /
1 row created.
SQL> insert into myTable(ID,  value)values (6,3)
  2  /
1 row created.
SQL> insert into myTable(ID,  value)values (8,123.45)
  2  /
1 row created.
SQL> insert into myTable(ID,  value)values (9,98.23)
  2  /
1 row created.
SQL>
SQL> select * from myTable
  2  /
        ID      VALUE
---------- ----------
         1          9
         2       2.11
         3       3.44
         5         10
         6          3
         8     123.45
         9      98.23
7 rows selected.
SQL>
SQL>
SQL>
SQL> SELECT LN(value) FROM myTable
  2  /
 LN(VALUE)
----------
2.19722458
.746687947
1.23547147
2.30258509
1.09861229
4.81583622
4.58731167
7 rows selected.
SQL>
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table myTable
  2  /
Table dropped.
SQL>