How to divide distinct records in a table into batches

Hi all,
I need a small help . I have some 3 to 4 lakhs of records in table . I want to divide these records into batches by assigning some batchno to some set of records. i.e i'll query some distinct records those distinct records should be assigned to one batchno . i.e when i query there may be some 100 records of one unique value in a column and 1000 next and so on . I want to make these records to one one batchno . Can any one help in this regard.
Regards,
rakesh

May below given SQL help you...
WITH T AS
SELECT 'A' COL1 FROM DUAL UNION ALL
SELECT 'B' COL1 FROM DUAL UNION ALL
SELECT 'D' COL1 FROM DUAL UNION ALL
SELECT 'A' COL1 FROM DUAL UNION ALL
SELECT 'X' COL1 FROM DUAL UNION ALL
SELECT 'P' COL1 FROM DUAL UNION ALL
SELECT 'B' COL1 FROM DUAL
SELECT COL1 , 'BTCH_'||DENSE_RANK() OVER (ORDER BY COL1) BATCH_NO
FROM   T;
COL1     BATCH_NO
A     BTCH_1
A     BTCH_1
B     BTCH_2
B     BTCH_2
D     BTCH_3
P     BTCH_4
X     BTCH_5
7 rows returned in 0.00 seconds     *009*

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Hi Naren,
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143/52   PLS-00306: wrong number or types of arguments in call to
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