Returning a result from multiple columns based on the last date that the column has a value.

Question

I have this table named (pmtable)
ctrlno        jobid           docdate       work1      work2       work3
1                7              2/12/2014     20 hrs       
10 hrs
2                7             2/22/2014      35 hrs                       
15 hrs
3               7              2/28/2014                                       
12 hrs
4               8              1/17/2014      15 hrs        
13hrs
I want the result to be like this
jobid  work1    work2    work3
7        35hrs    10 hrs     12 hrs
Is this possible?

Answer 1

Hi serenace,
To achieve your requirement, you can reference the below.
DECLARE @Tbl TABLE(ctrlno INT,jobid INT,docdate DATE,work1 INT,work2 INT,work3 INT);
INSERT INTO @Tbl VALUES(1,7,'2/12/2014',20,10,NULL);
INSERT INTO @Tbl VALUES(2,7,'2/22/2014',35,NULL,15);
INSERT INTO @Tbl VALUES(3,7,'2/28/2014',NULL,NULL,12);
INSERT INTO @Tbl VALUES(4,8,'1/17/2014',15,13,23);
INSERT INTO @Tbl VALUES(4,8,'2/17/2014',15,NULL,NULL);
INSERT INTO @Tbl VALUES(4,8,'3/17/2014',NULL,16,NULL);
;WITH cte AS(
SELECT jobid,docdate,attr,value FROM
@Tbl
UNPIVOT
(value FOR attr IN(work1,work2,work3)) AS UT
cte2 AS(
SELECT jobid,attr,value , ROW_NUMBER() OVER(PARTITION BY jobid,attr ORDER BY docdate DESC) AS rn
from cte
SELECT jobid,ISNULL([work1],0) [work1],ISNULL([work2],0) [work2],ISNULL([work3],0) [work3] FROM
cte2
PIVOT
(SUM(value) FOR attr IN([work1],[work2],[work3])) AS PT
WHERE rn=1
If you have any question, feel free to let me know.
Eric Zhang
TechNet Community Support