Oracle Interview Questions | Duplicate Rows

Question

If a table contains duplicate rows, does a query result display the duplicate values by default? How can you eliminate duplicate rows from a query result?

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Dhruv2301 55 years 1 Answer 1382 views Great Grand Master 0

Answer ( 1 )

  1. swap007
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    Yes, the query will display duplicate rows.
    To eliminate duplicate rows, you can try the following query:

    WITH cte as (
    Selec contact_id, first_name, last_name, email,
    Row_number() OVER (PARTITION BY
    first_name,last_name,email
    ORDER BY
    first_name,last_name,email)row_num
    FROM Contacts
    )
    DELETE from cte where row_num > 1

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