Number of rows in all of your tables.

Question

Hello,
If I want to discover the number of rows in all of my tables (e.g. I own 20 tables and each table has 50 rows), why is the following code not providing the answer:
SELECT count(*)
FROM (SELECT table_name
FROM all_tables
WHERE owner = 'SHIRISH');
Thanks in advance,
Shirish

Answer 1

Yes, EXTEND, FIRST and LAST are related to using collections. Actually, I think you're wrong about using 0 to indx. Looking at his code, I believe that would need to be 1 to indx. Which of course, demonstrates the reason to use FIRST and LAST. That way you don't have to make assumptions about the index range. I wouldn't have kept the index separately. I would have use the COUNT attribute when adding elements to the collection. Actually, I probably wouldn't have used the extra collection at all given what that code does ...
declare
    type ttab_table_name is table of user_tables.table_name%type;
    tab_table_name ttab_table_name;
    vint_cnt integer;
begin
    select table_name
    bulk collect into tab_table_name
    from user_tables;
    for i in tab_table_name.first .. tab_table_name.last loop
        execute immediate 'SELECT COUNT (*) FROM '
            || tab_table_name(i) into vint_cnt;
        dbms_output.put_line(rpad(tab_table_name(i), 35, ' ')
            || '- ' || to_char(vint_cnt, '999,999,999'));
    end loop;
end;
/