How do I delete duplicate rows and keep the first row?

Question

I made a mistake and I have unwanted duplicates.

I have a table with 4 key fields. A1, k1, k2, k3.

Answer 1

Someting like this?

DELETE FROM myviews WHERE EXISTS(SELECT CONCAT(k1, k2, k) AS dup_value
FROM myviews
GROUP BY dup_value
HAVING (COUNT(dup_value) > 1));