You need some SQL here. The following query will show you which questions have a duplicate value.

SELECT 
    questions, 
    CONCAT(option_a, option_b, option_c, option_d) AS options, 
    COUNT(*) AS howmany
FROM 
    yourtable
GROUP BY
    questions, options
HAVING
    howmany > 1

[download]

But if you simply want to delete the duplicates, then use ALTER TABLE to add a unique index to your table. Notice that you may need to qualify your columns with the number of characters to include. (See the appropriate manual page for details.) 

ALTER IGNORE TABLE yourtable 
    ADD UNIQUE KEY (questions, option_a, option_b, option_c, option_d)
+;

[download]

This will also prevent duplicates to happen in the future.

In reply to Re: OT: routine for finding duplicate entries from a MySQL Table by Caron
in thread OT: routine for finding duplicate entries from a MySQL Table by soon_j

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