Answer Posted / inder kumar singh

1) If all coumns are duplicate
create tablet tbl_deleteDuplicate
(
emp_id numeric,emp_name varchar(100)
)

insert into tbl_deleteDuplicate values(1,'a')
insert into tbl_deleteDuplicate values(1,'a')
insert into tbl_deleteDuplicate values(2,'b')
insert into tbl_deleteDuplicate values(3,'c')
insert into tbl_deleteDuplicate values(4,'d')
insert into tbl_deleteDuplicate values(4,'d')
insert into tbl_deleteDuplicate values(5,'e')
insert into tbl_deleteDuplicate values(5,'e')
insert into tbl_deleteDuplicate values(6,'f')

set rowcount 1
while @@rowcount > 0
delete a from tbl_deleteDuplicate a where
(select count(*) from tbl_deleteDuplicate b
where a.emp_id = b.emp_id)>1
set rowcount 0
select * from tbl_deleteDuplicate
set nocount off

2) if value column is duplicate

truncate table tbl_deleteDuplicate
insert into tbl_deleteDuplicate values(1,'a')
insert into tbl_deleteDuplicate values(2,'a')
insert into tbl_deleteDuplicate values(3,'b')
insert into tbl_deleteDuplicate values(4,'c')
insert into tbl_deleteDuplicate values(5,'d')
insert into tbl_deleteDuplicate values(6,'d')
insert into tbl_deleteDuplicate values(7,'e')
insert into tbl_deleteDuplicate values(8,'e')
insert into tbl_deleteDuplicate values(9,'f')
insert into tbl_deleteDuplicate values(10,'f')
insert into tbl_deleteDuplicate values(11,'f')

delete tbl_deleteDuplicate where emp_id not in
(
select max(emp_id) from tbl_deleteDuplicate group by
emp_name having count(emp_name)>1
)
and emp_id not in
(
select max(emp_id) from tbl_deleteDuplicate group by
emp_name having count(emp_name)=1
)

select * from tbl_deleteDuplicate

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