Question

I want to project the pid indexes for all products which have the same title, as I’m using the following as a sub query.

Product(pid, title)

SELECT p.title
FROM product p
group by title
HAVING ( COUNT(p.title) > 1 )

this outputs the duplicate titles fine, but how do I project the pid‘s instead?

Answer 1

SELECT p.pid, p.title
FROM product p 
     INNER JOIN 
     (SELECT p.title
      FROM product p
      GROUP BY title
      HAVING (COUNT(p.title) > 1)) t ON t.title = p.title

here is an example of it working with sqlfiddle:

http://sqlfiddle.com/#!3/25e77/1