clean double rooms

Hello, I have a table called film with the title of the columns and title_original witch contains about ~ 500 movies.

The problem: some of the movies are in the table twice, double. Their id (pk) is different.

I don't know how to clean it. I would like a statement that the first of me watch witch films are included in the table twice, and then I would have an update feature that search for double and remove one of them, where I want a condition (ex, keep the film with id lowest)

Regards, Johan

Hi, Johan.

What is your definition as duplicates? I guess that's two or more lines with the same title. If a role title_original, adapt the code below, or explain.

To see the duplicates:

SELECT    *
FROM      movie
GROUP BY  title
HAVING    COUNT (*) > 1
;

To remove duplicates:

DELETE FROM  movie  m
WHERE   id !=
        (
        SELECT  MIN (id)
        FROM    movie
        WHERE   title = m.title
        )
;

Tags: Database

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