SQL: Find table with max no. of rows

Question

I have a table containing list of table names for each owner; as
## Table: db_tables
OWNER TABLE_NAME
a ta_1
a ta_2
a ta_3
b tb_1
b tb_2
c tc_1
Now, i want to know the table with max. no. of rows for each owner
Plz....can anyone gimme a solution for the above ......

Answer 1

Assuming 10g and above:
SQL>  SELECT owner,
             MAX(table_name) KEEP (DENSE_RANK FIRST ORDER BY XMLQUERY (t RETURNING CONTENT).getnumberval() DESC) table_name,
             MAX(XMLQUERY (t RETURNING CONTENT).getnumberval()) cnt
    FROM (SELECT owner,table_name,    'count(ora:view("' || table_name || '"))' t
            FROM all_tables
           WHERE owner IN ('MICHAEL','SCOTT'))
           GROUP BY owner
OWNER                          TABLE_NAME                            CNT
MICHAEL                        SERVICE_ZIP                       1000000
SCOTT                          EMP                                    14
2 rows selected.