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AlexanderMike/SQL deduplicate

Created May 4, 2016 17:35
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SQL deduplicate
Here's a handy query for finding duplicates in a table. Suppose you want to find all email addresses in a table that exist more than once:
http://www.petefreitag.com/item/169.cfm
SELECT email,
COUNT(email) AS NumOccurrences
FROM users
GROUP BY email
HAVING ( COUNT(email) > 1 )
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