Oracle PL/SQL Tutorial/Numerical Math Functions/LN

select ln(32)

   <source lang="sql">

SQL> SQL> SQL> SQL> select ln(32)

 2  from   dual;
   LN(32)

---

3.4657359

SQL> SQL></source>

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

   <source lang="sql">

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></source>

Using the LN function

   <source lang="sql">

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></source>