SELECT name, COUNT(email)
FROM users
GROUP BY email
HAVING COUNT(email) > 1
-- copy values from old column to new column
UPDATE tablename SET new_column = old_column
• SELECT first_name, COUNT (first_name) FROM employees
GROUP BY first_name
HAVING (COUNT(first_name) > 1);
SELECT columnName, COUNT(columnName)
FROM tableName
GROUP BY columnName
HAVING COUNT(columnName)>1
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')
SELECT
name,email, COUNT(*) AS CountOf
FROM @YourTable
GROUP BY name,email
HAVING COUNT(*)>1