Finding Duplicates data in one Table with SQLsql server

Kapildalke
Posted by Kapildalke under Sql Server category on | Points: 40 | Views : 1082
duplicates in a table. Suppose you want to find all email addresses in a table that exist more than once:

SELECT email,
COUNT(email) AS NumOccurrences
FROM users
GROUP BY email
HAVING ( COUNT(email) > 1 )

You could also use this technique to find rows that occur exactly once:

SELECT email
FROM users
GROUP BY email
HAVING ( COUNT(email) = 1 )

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