Calculate no.of rows in block/blocks in schema

Question

Hi,
Database :10.2.0.4 RAC ASM
OS: AIX 5.2/5.3
I want to calculate no. of rows exists in a block or in all blocks.
I went to google and found some calculation to get ,but not able to understand in analyzing with minextens,etc.,
Here i am giving my schema dba_segments output for analysis.
SQL>select segment_type,bytes,blocks,extents,initial_extent,min_extents,max_extents from * dba_segments * where owner='SUNAND';
segment_type     bytes      blocks     extents     initial_extent     min_extents     max_extents     
INDEX     65536     *8*     1     *65536*     1     *2147483645*     
INDEX     65536     *8*     1     *65536*     1     *2147483645*     
TABLE     65536     *8*     1     *65536*     1     *2147483645*     
TABLE     65536     *8*     1     *65536*     1     *2147483645*
INDEX     84934656     *10368*     82     *65536*     1     *2147483645*     
I have separated the output with bold identification.
Could you tell me , * how do i have to find the no. of rows in a table or rows in blocks * ?.
Please tell me , if you need any further information for analysis.
Thanks & Regards,
Sunand

Answer 1

I've found an answer in "Ask Tom" site:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:707430700346624722
create table t ( x int ) pctfree 0;
insert into t select null from all_objects where rownum <= 10000;
select count(*)
from t
where dbms_rowid.rowid_block_number(rowid) = (select min(dbms_rowid.rowid_block_number(rowid)) from t);
COUNT(*)
734
Hope it helps.
Roni.