如何返回具有最新日期的行？

Question

我的查詢返回的數據，如：

ID | ProcessID | Type| Value | Date 
-------------------------------------------------- 
1 |  2  | A | 10 | 2/23/2016 10:10:42 AM 
1 |  2  | B | 20 | 2/23/2016 10:10:42 AM 
1 |  2  | C | 30 | 2/23/2016 10:10:42 AM 
1 |  1  | A | 11 | 1/6/2016 12:48:04 PM 
1 |  1  | B | 21 | 1/6/2016 12:48:04 PM 
1 |  1  | C | 31 | 1/6/2016 12:48:04 PM 
2 |  4  | A | 10 | 7/21/2016 11:28:22 AM 
2 |  4  | B | 20 | 7/21/2016 11:28:22 AM 
2 |  4  | C | 30 | 7/21/2016 11:28:22 AM 
2 |  3  | A | 11 | 6/21/2016 09:41:07 AM 
2 |  3  | B | 21 | 6/21/2016 09:41:07 AM 
2 |  3  | C | 31 | 6/21/2016 09:41:07 AM 

可是，我真的只在乎獲取最新的類型的A，B和C這樣的數據，我的回報應該是這樣的：

ID | ProcessID | Type| Value | Date 
-------------------------------------------------- 
1 |  2  | A | 10 | 2/23/2016 10:10:42 AM 
1 |  2  | B | 20 | 2/23/2016 10:10:42 AM 
1 |  2  | C | 30 | 2/23/2016 10:10:42 AM 
2 |  4  | A | 10 | 7/21/2016 11:28:22 AM 
2 |  4  | B | 20 | 7/21/2016 11:28:22 AM 
2 |  4  | C | 30 | 7/21/2016 11:28:22 AM 

我試過在select子句中使用max，但那不起作用。

這裏是我的SQL，限制例如一個 「ID」 的緣故，實際回報樣品一起：

select f.folderrsn,fpi.processrsn,fpi.infocode, fpi.infovalue, fp.enddate 
from folderprocessinfo fpi 
join folderprocess fp on fp.processrsn = fpi.processrsn 
join folder f on f.folderrsn = fp.folderrsn 
where fpi.infocode in (51437,51438,51439) 
and trunc(f.issuedate) > '01-JAN-16' 
and not fpi.infovalue is null 
and f.folderrsn = 11179547 --limited to one "ID" for example 
order by fp.enddate asc 

返回：

"FOLDERRSN","PROCESSRSN","INFOCODE","INFOVALUE","ENDDATE" 
"11179547","37159700","51437","91","6/2/2015 10:27:46 AM" 
"11179547","37159700","51438","0","6/2/2015 10:27:46 AM" 
"11179547","37159700","51439","145.5","6/2/2015 10:27:46 AM" 
"11179547","37540455","51437","91","7/24/2015 6:44:08 AM" 
"11179547","37540455","51438","0","7/24/2015 6:44:08 AM" 
"11179547","37540455","51439","145.5","7/24/2015 6:44:08 AM" 

Answer 1

您可以使用row_number() ：

with f as (
     select f.folderrsn, fpi.processrsn, fpi.infocode, 
      fpi.infovalue, fp.enddate 
     from folderprocessinfo fpi join 
      folderprocess fp 
      on fp.processrsn = fpi.processrsn join 
      folder f 
      on f.folderrsn = fp.folderrsn 
     where fpi.infocode in (51437, 51438, 51439) and 
      trunc(f.issuedate) > '01-JAN-16' and 
      fpi.infovalue is not null 
    ) 
select f.* 
from (select f.*, 
      row_number() over (partition by processid, type order by enddate desc) as seqnum 
     from f 
    ) f 
where seqnum = 1 
order by enddate asc;