Returns all rows which have same column value based on other column value

Question

Consider I have the following table:

Id      | sid          | email
___________________________________________________
1       | 10           | john@yahoo.com
2       | 11           | elsa@gmail.com
3       | 10           | johnconnor@gmail.com
4       | 10           | john.smith@gmail.com
5       | 12           | ninjamutant@yahoo.com

I would like to query all rows which have same "sid" by passing known "email" So if I pass the email as "john.smith@gmail.com", it should return rows with id number 1, 3, and 4.

Answer 1

Try this :

select * from yourtable a
inner join (
    select sid 
    from yourtable
    where email = "john.smith@gmail.com"
) b on b.sid = a.sid

Answer 2

select T2.*
from my_table T1 join my_table T2
on T1.sid = T2.sid
where T1.email = 'xxx'