Is there a way to find the length of a line, not a column

I'm trying to find the length of a particular line in a table... is it possible?
I don't mean length of the column value... I can get by using LENGTH (COLUMNNAME)
I'm not average line length, I can get extended calculation or using the trace file.
Please let me know if there is a function, that allows to calculate or any other solution.

Thank you!

>
(1) select avg_row_len from dba_tables
where table_name = 'abc ';
I got the length of the average line like 65
That means 65... It is 65 bytes/KB/MB, or what exactly is 65?
>
This means that 65 bytes - see ALL_TABLES in doc database
http://docs.Oracle.com/CD/B19306_01/server.102/b14237/statviews_2105.htm#i1592091
>
(2) also a member of the team of mine use this query:
SELECT sum (data_length) FROM ALL_TAB_COLUMNS WHERE
table_name = 'ABC ';
and divided the result above with the number of rows in this table

Suppose that gives only the length of the average column type... is not our requirement?
>
At best, that would give you the MAXIMUM length that COULD be a line. It will not help at all. For example all columns defined as NUMBER (with any precision or scale) appears in the form of bytes 22 since they can take a lot. And a VARCHAR2 (4000) will be listed as 4000 even if it is NULL or if the average length is 2 bytes.

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