Jay R
asked on
Finding duplicate records in tables
I have a table with some duplicate records in them
Can someone please suggest the best or most efficient way of quickly finding out duplicates in a table & print those records out.
Can someone please suggest the best or most efficient way of quickly finding out duplicates in a table & print those records out.
Vitor Montalvão
Which fields should we query to know that the record is duplicated (ID, name, ...)?
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btw I see this is your first week here, so welcome to EE.
HI Jay,
For example, If you want to check duplicate Email in one of the column in a table
SELECT email,
COUNT(email) AS NumOccurrences
FROM users
GROUP BY email
HAVING ( COUNT(email) > 1 )
For example, If you want to check duplicate Email in one of the column in a table
SELECT email,
COUNT(email) AS NumOccurrences
FROM users
GROUP BY email
HAVING ( COUNT(email) > 1 )