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Finding length of numeric datatype field

I want to find the length of a numeric datatype field in my table. How can I find it?

I want to find the length of a numeric datatype field in my table. How can I find it?
Here is an example; use the vsize function:
SQL> create table test (col1 number);

Table created.

SQL> insert into test values (123456789)
SQL> /

1 row created.

SQL> commit;

Commit complete.

SQL> select length(col1) from test
SQL> /

LENGTH(COL1)
------------
           9

SQL> select vsize(col1) from test;

VSIZE(COL1)
-----------
          6

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