Find rows that have the same value on a column in MySQL

Question

In a [member] table, some rows have the same value for the email column.

login_id | email
---------|---------------------
john     | john123@hot         


        

Answer 1

I know this is a very old question but this is more for someone else who might have the same problem and I think this is more accurate to what was wanted.

SELECT * FROM member WHERE email = (Select email From member Where login_id = john123@hotmail.com) 

This will return all records that have john123@hotmail.com as a login_id value.

Answer 2

select email from mytable group by email having count(*) >1