Hi Friends,
I have a input data like,
class_id Marks
101 50
101 60
101 40
102 90
102 35
And i want my output data like
class_id Marks Rank
101 50 2
101 60 1
101 40 3
102 90 1
102 35 2
how to do this in datastage?
Answer Posted / ankit gosain
Hi friends,
This question is a trick and as i found in every answer
given previously, there is a slight miss-queue.
Check out my solution for this question:
I/p File(Primary)
!
I/p
file---->Sort---->Sort---->transformer---->join/lookup---->O/p
File
(1). In the first sort stage, make class_id and marks fields
as keys, sort by descending and then create a Key change column.
(2). In second sort stage, make class_id only as a key
(don't sort previously sorted) and create a cluster key
change column.
(3). You will get the o/p as given below:
Class_Id, Marks, KeyChange, ClusterKeyChange
102,90,1,1
102,35,1,0
101,60,1,1
101,50,1,0
101,40,1,0
(4). In transformer stage take a integer type variable say
var1 and create one column say Rank.
Now, derive Var1 as :
if ClusterKeyChange=1 then 1 else Var1
And, derive Rank as :
if ClusterKeyChange=1 then 1 elseif (ClusterKeyChange=0 and
KeyChange=0) then Var1 else Var1+1
(5). Take only class_id, marks & rank as an o/p of the
transformer, so that you will have the o/p as given below:
Class_id, Marks, Rank
102,90,1
102,35,2
101,60,1
101,50,2
101,40,3
(6). Now finally, apply join/lookup and take this o/p as a
Reference data and Primary data will be the Source I/p File.
Take Class_id and Marks as keys and derive Rank to the o/p,
so that you will get the finally o/p as given below:
class_id Marks Rank
101 50 2
101 60 1
101 40 3
102 90 1
102 35 2
If you have any other doubt, you can mail me at
ankitgosain@gmail.com
Cheers,
Ankit :)
Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
How to manage date conversion in Datastage?
What is the command line function to import and export the ds jobs?
Define data aggregation?
Source has 2 columns: USA,NewYork INDIA,MUMBAI INDIA,DELHI UDS,CHICAGO INDIA,PUNE i want data in target like below: INDIA,MUMBAI1 INDIA,DELHI2 INDIA,PUNE3 USA,NEWYORK1 USA,CHICAGO2
What are transforms and what is the differenece between routines and transforms?
What are constraints and derivations?
What are the features of datastage flow designer?
How many types of hash files are there?
what should be ensure to run the sequence job so that if its get aborted in 10th job before 9job should get succeeded?
DB2 connector> transformer > sequential file Data will be exported into a csv format in a sequential file. This file will be send in a email using a sequence job. Problem here is, how to avoid sending a blank csv file? When I ran the job there are chances that it might return zero records but in the sequence job csv file is going blank. how can I avoid this? thanks
Explain entity, attribute and relationship in datastage?
Why do you need stage variables?
If we take 2 tables(like emp and dept),we use join stage and how to improve the performance?
How we can covert server job to a parallel job?
How many areas for files does datastage have?