How can count Duplicate value in column?

Regards:
M K SINGH

Like this:
SQL> create table t(a number);
Table created.
SQL> insert into t values (1);
1 row created.
SQL> insert into t values (2);
1 row created.
SQL> insert into t values (2);
1 row created.
SQL> insert into t values (3);
1 row created.
SQL> insert into t values (4);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t;
         A
         1
         2
         2
         3
         4
SQL> select a, count(*) from t group by a;
         A   COUNT(*)
         1          1
         2          2
         4          1
         3          1
SQL>

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Sigh. I answered this in your other How can I convert table object into table record format?.
Please do not open multiple threads. It just confuses people and makes the trreads hard to follow. Also, please remember we are not Oracle employees, we are all volunteers here. We answer questions if we can, when we can. There is no SLA so please be patient.
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Reference : http://www.oracle.com/technology/oramag/oracle/04-mar/o24tech_data.html
Topic : When to Use Table Compression
Bug
Reference : http://dba.ipbhost.com/lofiversion/index.php/t147.html
BUG:<2421054>
Affects: RDBMS (9-A0)
NB: FIXED
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[email protected]

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in below query docno no is repeated again and again
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How can count Duplicate value in column?

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