For instance, I have a table say "Name" with duplicate records in it:
Id | Firstname
--------------------
1 | John
2 | John
3 | Marc
4 | Jammie
5 | John
6 | Marc
How can I fetch duplicate records and display them with their receptive primary key ID?
Use Count()Over() window aggregate function
Select * from
(
select Id, Firstname, count(1)over(partition by Firstname) as Cnt
from yourtable
)a
Where Cnt > 1
SELECT t.*
FROM t
INNER JOIN
(SELECT firstname
FROM t
GROUP BY firstname
HAVING COUNT(*) > 1) sub
ON t.firstname = sub.firstname
A sub-query would do the trick. Select the first names that are found more than once your table, t. Then join these names back to the main table to pull in the primary key.
