Solution for a SQL Query needed immediately

Dear Friends...
I am in help of a solution for the Query which has been asked me in an interview..I failed to find the solution for the query mention below..
Query...
col1 col2
a 0
a 0
a 0
a 0
b 0
b 0
b 0
c 0
c 0
d 0
write a query to get the output as
col2 value shud be the no of occurences of col1 values...
Solution shud be like this
col1 col2
a 4
a 4
a 4
a 4
b 3
b 3
b 3
c 2
c 2
d 1
Kindly anybody plz do give me the solution immediately..
Srinivas

Set up the table
SQL> create table a ( col1 CHAR(1) );
Table created.
<< insert data >>
SQL> select * from a;
C
a
a
a
a
b
b
b
c
c
d
10 rows selected.A SELECT statement with a simple GROUP BY will get counts for each letter
1 select col1, count(*)
2    from a
3* group by col1
SQL> /
C   COUNT(*)
a          4
b          3
c          2
d          1Now, join that GROUP BY statement to the original table
SQL> ed
Wrote file afiedt.buf
1 select a.col1, grp_a.cnt
2    from a,
3         (select col1, count(*) cnt
4            from a
5           group by col1) grp_a
6* where a.col1 = grp_a.col1
SQL> /
C        CNT
a          4
a          4
a          4
a          4
b          3
b          3
b          3
c          2
c          2
d          1
10 rows selected.Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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