Delete duplicate records from oracle table

Ahmed S — Mon, 03 Jun 2013 06:33:00 +0000

Delete duplicate records from oracle table

Note: please before executing this query take data backup.

Example I:

Delete from employees

where rowid in

(select rowid

from

(select first_name, last_name, rowid,

row_number() over

(partition by first_name, last_name order by employee_id)

stf_row

from employees)

where stf_row > 1);

Example II :

Delete FROM

Employees A

WHERE

a.rowid >

ANY (

SELECT

B.rowid

FROM

Employees B

WHERE

A.First_name = B.First_Name

AND

A.last_name = B.Last_Name

);

Example III :

Delete from

Employees A

Where rowid <> (

SELECT

Max(rowid)

From

Employees B

Where

B.First_Name = A.First_Name

AND

B.Last_Name = A.Last_Name )

Result

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