sql select min or max based on condition

Question

Hi all I'm trying to find a way to select min or max from a range of data based on these conditions:

• If setuptime and processtime cols are all 0 select MIN(oprNum) (operation hasn't started yet so get first oprnum)
• If setuptime and process time are not 0, get max oprnum (active operation).

Based on either of these I want ONE row... Please see attached example of data. Thanks! This is part of a much larger query so i need 1 output row per prodid...

+------------+--------+---------+--------------------+--------------------+
| ProdId     | OprNum | Company | SetupTime          | ProcessTime        |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 10     | 12      | 1.3400000000000000 | 1.6100000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 10     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 15     | 12      | 1.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 50     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 60     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 60     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 70     | 12      | 0.0700000000000000 | 0.0400000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 70     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+

Answer 1

updated query: based on last comment

if the max record has 0 times, i want to select the last record that has a setuptime or process time. If I add this row to your fiddle ('12M0003381',80,12,0.00,0.00) I get this row when i want the last one with a setuptime or process time

logic used by this query is to simply calculate an additional column weighted_value. In outer query we use min over value and max over weighted value like before.

select 
  t.prodId,
  case when MAX(t.setuptime+ t.processtime)>0 then MAX(t.weighted_value) else MIN(t._value) end as value
from (
    select 
         prodID,
         oprnum as _value,
         setuptime,
         processtime,
         case 
           when setuptime+processtime>0 
           then oprnum 
           else NULL 
           end as weighted_value from tbl
    ) t
group by t.prodID

updated fiddle link: http://sqlfiddle.com/#!6/b7ecb/20

please try this query

select t1.ProdId, case when exists(
select 1 from tbl  t2 where t2.setuptime >0 or t2.Processtime>0 and t2.prodId=t1.prodId
)  then MAX(t1.oprNum) ELSE MIN(t1.oprNum) END
from tbl t1
group by ProdId

sql fiddle link http://sqlfiddle.com/#!6/c52e22/1

Answer 2

One way:

SELECT 
    ProdId, 
    CASE WHEN SUM(SetupTime) + SUM(ProcessTime) = 0 THEN MIN(oprNum) ELSE MAX(oprNum) END 
FROM T
GROUP BY ProdId