QUERY HELP NEEDED

Hi All,
i need ur help this is the query i have written now what i want is the maximum value from EXPR1 column i try to use use MAX(Count(COL1)) but it give error pls help me to achieve this task. i hope u understand my question. thanku.

SELECT COUNT(TABLE1.COL1) AS Expr1, TABLE2.COL2 FROM TABLE1,TABLE2 where TABLE1.COL1 = TABLE2.COL1 GROUP BY TABLE2.COL2
ORDER BY expr1 DESC

RESULT

EXPR1      COL2
6             1212131
6             1212131
4             121121
2             1212121

what i want is the maximum values

RESULT

EXPR1         COL2
6                 1212131
6                 1212131