Deletion of duplicates in the table with out using rowid

How can I delete duplicates in the table with out using ROWID .

hi
sleect count(coulmnname),columnname from table
group by columnname
having count(columnname) > 1;
find the primary key of the table
apply the below query
delete from table
where (primary key,repeated column name )
not in
( select min(primary key), repeated column
from employee group by repeated column );
use this in the primary key column use empid ,,,the repated column is ename
empid ename
1 sankar
2 sankar
try this one

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Message was edited by:
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In addition:
You might want to think about the 'upper-/lowercase-thing' and still being/being not duplicate in these cases.
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MHO%xe> select * from
2 (
3 with all_your_data_are_belong_to_us -- generate some data on the fly here
4 as (
5      select 1 Id, 'Xyz' empfirstname, 'Abc' emplastname, 'Software Eng' empdesig from dual uni
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7      select 3, 'aaa', 'AAA', 'Fairy' from dual union all
8      select 4, 'AAA', 'aaa', 'Fairy' from dual union all
9      select 5, 'Zlad', 'Molvania', 'Electrician' from dual union all
10      select 6, 'Kkk', 'Ddd', 'Architect' from dual
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         4 AAA aaa      Fairy                 2
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         1 Xyz Abc      Software Eng          2
Verstreken: 00:00:00.68
MHO%xe> select * from
2 (
3 with all_your_data_are_belong_to_us -- generate some data on the fly here
4 as (
5      select 1 Id, 'Xyz' empfirstname, 'Abc' emplastname, 'Software Eng' empdesig from dual uni
on all
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7      select 3, 'aaa', 'AAA', 'Fairy' from dual union all
8      select 4, 'AAA', 'aaa', 'Fairy' from dual union all
9      select 5, 'Zlad', 'Molvania', 'Electrician' from dual union all
10      select 6, 'Kkk', 'Ddd', 'Architect' from dual
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15 ,      empdesig
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18 from   all_your_data_are_belong_to_us --<< this could be YOUR table name, if so, omit the with-clause! ;-)
19 )
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Assuming that there may be other columns in the table;
with t as (
select 123 empcode, 'xyz' firstname, 'pk' lastname, 10 col4 from dual union all
select 456, 'yzz', 'pk', 20 from dual union all
select 456, 'yzz', 'pk', 30 from dual union all
select 101, 'kkk', 'jk', 40 from dual)
select empcode, firstname, lastname, col4
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       456 yzz       pk               20

Deletion of duplicates in the table with out using rowid

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