From: | JORGE MALDONADO <jorgemal1960(at)gmail(dot)com> |
---|---|
To: | pgsql-novice <pgsql-novice(at)postgresql(dot)org> |
Subject: | Please advice on a query |
Date: | 2018-07-11 16:05:54 |
Message-ID: | CAAY=A79xZ+pFsBmN7MdvwNEhZOd8=rY=ePo+X=Rp_XGqNC3xVg@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-novice |
I have a table more or less like this:
-----------------------------------------------------
crs_id some data req
-----------------------------------------------------
25 aaaaaaaa 21
25 aaaaaaaa 19
17 ccccccccc null
8 dddddddd null
19 eeeeeeee 15
19 xxxxxxxxx 37
15 fffffffffffffffff 10
10 gggggggg null
I need to delete rows according to the following criteria:
* Row with "crs_id = 25" must be deleted (only the second row) because "req
= 19" and there is a row with "crs_id = 19"
* Row with "crs_id = 19" must be deleted (only the first row) because "req
= 15" and there is a row with "crs_id = 15"
* Row with "crs_id = 15" must be deleted because "req = 10" and there is a
row with "crs_id = 10"
I have been struggling with this issue without a successful result.
Respectfully,
Jorge Maldonado
From | Date | Subject | |
---|---|---|---|
Next Message | David G. Johnston | 2018-07-11 16:16:46 | Re: Please advice on a query |
Previous Message | Tom Lane | 2018-07-10 22:54:35 | Re: Type of text literals |