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
what is flow of project?
On which interface you will be working as a developer?
How do y read Sequential file from job control?
Give an idea of system variables.
What are the types of hashed files in data stage
What are the different type of jobs in datastage?
How to write a expression to display the first letter in Caps in each word using transformer stage ? Please let me know ASAP Thanks in advance...
what is use of SDR function?
how can we validate the flat files using the date in the header and number of records in the flat file? Using both conditions at a time.
In Informatica,for the table I can find coreesponding dependent mappings.Likewise can I find the dependent jobs with all the information by using the table name
What are the functionalities of link partitioner?
What is the use of datastage director?
Demonstrate experience in maintaining quality process standards?
Which warehouse using in your datawarehouse
Difference between in process and inter process?