Identify a table with maximum rows in Oracle

Question

I have a set of tables in Oracle and I would like to identify the table that contains the maximum number of rows.

So if, A has 200 rows, B has 345 rows and C has 120

Answer 1

You could get the same result with one trawl of the data like so:

SELECT     DISTINCT
           FIRST_VALUE ( t.owner )
             OVER ( ORDER BY t.num_rows DESC NULLS LAST )
                                                 owner,
           FIRST_VALUE ( t.table_name )
             OVER ( ORDER BY t.num_rows DESC NULLS LAST )
                                                 table_name,
           FIRST_VALUE ( t.num_rows )
             OVER ( ORDER BY t.num_rows DESC NULLS LAST )
                                                 num_rows
FROM       all_tables                            t