I want to find the max(id) whose sts is 0 but whose id is not referenced by ref_id.
On Thu, Jun 2, 2016 at 4:07 PM, Dann Corbit <DCorbit@connx.com> wrote:
This is your request, translated directly into SQL
select max(id) from sometable where sts=0 and ref_id IS NULL
Looking at your sample, it seems that sts is always 1 when ref_id exists, so it may possibly simplify to:
select max(id) from sometable where sts=0
Please don't top-post.
Your query would select "id=6", which is disqualified due to id=7...
For the record one reads: "whose id is not referenced by ref_id" AS "id NOT IN (ref_ids....)"; ref_id IS NULL means "that lacks a ref_id" and is evaluated independent of the id.
