duplicate records in sql

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1SELECT username, email, COUNT(*)
2FROM users
3GROUP BY username, email
4HAVING COUNT(*) > 1
5

1SELECT name, COUNT(email) 
2FROM users
3GROUP BY email
4HAVING COUNT(email) > 1

1Multiple field=
2SELECT username, email, COUNT(*)
3FROM users
4GROUP BY username, email
5HAVING COUNT(*) > 1
6
7Single field=
8SELECT _column, COUNT(*) 
9FROM _table
10GROUP BY _column
11HAVING COUNT(*) > 1

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