![]() ![]() ALTER TABLE products ADD COLUMN temp SERIAL PRIMARY KEY DELETE t1. She primarily focuses on the database domain, helping clients build short and long term multi-channel campaigns to drive leads for their sales pipeline. Second solution: add temporary autoincrement, delete records using it, and drop temp field. Nupur Dave is a social media enthusiast and an independent consultant. If you need help with any SQL Server Performance Tuning Issues, please feel free to reach out at is also a CrossFit Level 1 Trainer (CF-L1) and CrossFit Level 2 Trainer (CF-L2). Pinal is an experienced and dedicated professional with a deep commitment to flawless customer service. You can express what you want by putting the logic inside the filter, e.g. Since we have identified the duplicates/triplicates as the rows where RowNumber is greater than 1 above, all we need to do is delete such records. To freely share his knowledge and help others build their expertise, Pinal has also written more than 5,500 database tech articles on his blog at. This makes sense given that you cant delete from what is essentially a logical view (a CTE). If you want to delete the duplicates, here's a much simpler way to do it than having to find even/odd rows into a triple sub-select: SELECT id, name, email FROM users u, users u2 WHERE u.name u2.name AND u.email u2.email AND u.id > u2. Pinal has authored 13 SQL Server database books and 45 Pluralsight courses. The following code is selecting duplicate rows to be deleted using the ROWNUMBER () function. Now we will delete the above selected duplicate rows using CTE by using the following code. He holds a Masters of Science degree and numerous database certifications. Both methods give the same result, but they have different costs. ![]() Pinal Dave is an SQL Server Performance Tuning Expert and independent consultant with over 17 years of hands-on experience.
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