Question

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How to delete duplicate rows with SQL?

I have a table with records and I want to delete all duplicate records

DELETE FROM 'table'
WHERE 'field' IN 
(
SELECT 'field' FROM 'table' GROUP BY 'field'
HAVING (COUNT('field')>1)
)

Why isn’t this working?

Answer 1

Maybe you can explore with the command DISTINCT to select only unique records based in a field.

You can create a new table with the unique entries based.
As an example…

CREATE TABLE nonDuplicates  
SELECT DISTINCT * FROM yourTable group by field