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sql query to find duplicates in column

By Unusual UnicornUnusual Unicorn on Jun 01, 2020
SELECT name, COUNT(email) 
FROM users
GROUP BY email
HAVING COUNT(email) > 1

Source: stackoverflow.com

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get duplicate records in sql

By Obedient OcelotObedient Ocelot on Jan 28, 2021
Multiple field=
SELECT username, email, COUNT(*)
FROM users
GROUP BY username, email

Single field=
SELECT _column, COUNT(*) 
FROM _table
GROUP BY _column

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By Motionless MantisMotionless Mantis on Aug 17, 2020
declare @YourTable table (id int, name varchar(10), email varchar(50))

INSERT @YourTable VALUES (1,'John','John-email')
INSERT @YourTable VALUES (2,'John','John-email')
INSERT @YourTable VALUES (3,'fred','John-email')
INSERT @YourTable VALUES (4,'fred','fred-email')
INSERT @YourTable VALUES (5,'sam','sam-email')
INSERT @YourTable VALUES (6,'sam','sam-email')

    name,email, COUNT(*) AS CountOf
    FROM @YourTable
    GROUP BY name,email

Source: stackoverflow.com

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