How do I find duplicate values in a SQL table?

DEdevcircle_editorialasked Sep 23, 2026

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I want to identify email addresses that appear in more than one row.

Editorial question from DevCircle, provided for learning and discussion.

1 answerHelpful solutions from the community

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Use SELECT email, COUNT(*) FROM users GROUP BY email HAVING COUNT(*) > 1;. Define normalization and NULL handling according to your requirements before treating matching groups as duplicate accounts.

Reference: Official documentation.

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