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Editorial Team
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Asked: 2026-05-31T05:10:00+00:00

I am using the following query to find duplicate records and have verified it

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I am using the following query to find duplicate records and have verified it runs correctly. 

SELECT MLS_LISTING_ID, STREET_NUMBER, STREET_NAME, UNIT_NUMBER, MLS_ID, SALE_PRICE, ZIP_CODE, TLN_REALTOR_ID, COUNT(mls_id)
FROM idx_FM_BO_NA
GROUP BY TLN_REALTOR_ID, STREET_NUMBER, STREET_NAME, UNIT_NUMBER, SALE_PRICE
HAVING COUNT(distinct MLS_ID) > 1;

How do I alter this query to delete duplicates so that there is only one instance of the record? I don’t worried which record(s) get deleted, but I need one of them to stay.

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1 Answer

  1. Editorial Team

    I think this answer is correct:

    delete from table1 USING table1, table1 as vtable 
WHERE table1.ID<vtable.ID AND table1.field_name=vtable.field_name

    The only difference between this one and paulsm4’s answer that the ids are compared using less-than rather than not-equals. That way, later are not compared with earlier records (which means that one and only one of the identical records will be kept). I tested this out with my own data that I needed this for, and it worked.

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