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length [Oracle SQL]

length(string)
lengthb(string)
lengthc(string)
length2(string)
length4(string)
length returns the length of the string passed.
If string is a number, it first converts the number into a string and then returns its length.
As Oracle treats an empty string as null, the length of an empty string is also null. 
select
       length('hello world'),
       length(42),
       length(9.0),
       length(10.1),
       length(-8),
       length('')
from 
       dual;

LENGTH('HELLOWORLD') LENGTH(42) LENGTH(9.0) LENGTH(10.1) LENGTH(-8) LENGTH('')
-------------------- ---------- ----------- ------------ ---------- ----------
                  11          2           1            4          2