Answer / sivadasan

I think simply we can do like the following..

1. First we have to transfer all data from a table to
temporary table

create table Temp_table as select * from original_table;

2. Delete all record from Original Table....

delete original_table;

3. Now we can write a query by using INSERT and UNION

If any issue let me know....

insert into original_table (select * from temp_table
UNION select * from UNION )

Answer / umadevi

--deletes records within table without changing table name
delete from temp t1 where rowid<(select max(rowid) from temp
t2 where t1.empno=t2.empno) order by empno;

or
--create new table n insert records.
create table t1 as select distinct * from temp;

or
(truncate table)
truncate table t1;
insert into t1 select distinct * from temp;

Answer / swapna

One way is to rename the original table to something else,
and copy the unique records into the original table.

rename 'Table2', 'Table1'

select distinct * into Table2 from Table1

drop table1

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