Question

I’m having trouble with a query doing other than what I intend for it to do.
employer ID’s(eh_id) for each of the employee ID’s (pmt_id) I have in my database.

My query as it stands is as follows:

 SELECT *
  FROM employer_history table1
  WHERE eh_id =
    (
      SELECT eh_id
      FROM employer_history table2
      WHERE table1.eh_id = table2.eh_id
      group by table2.eh_id
    )
  and table1.eh_pmt_id in (131,3725)

What I’m getting is:

eh_id ¦ eh_pmt_id
123 ¦ 131
124 ¦ 131
125 ¦ 3725
126 ¦ 3725

What I’m expecting is:

eh_id ¦ eh_pmt_id

124 ¦ 131
126 ¦ 3725

I would appreciate any help on this as I am getting nowhere with it myself

Cheers

Answer 1

You can use an analytical function for this:

SELECT *
FROM (  SELECT *, ROW_NUMBER() OVER(PARTITION BY peh_pmt_id ORDER BY eh_id DESC) Corr
        FROM employer_history 
        WHERE eh_pmt_id in (131,3725)) t1
WHERE Corr = 1