Concatenate attributes/fields from multiple records based(group by) on a key column

Input data

Acc_num	Transaction_Type_ID	Transaction_type
2156	1	Cash deposit
2156	3	Pin change
8463	2	Cash Withdraw
8463	4	Balance enquiry
8463	1	Cash deposit

Output structure should be group by customer_id and concatenate notes from the multiple records.

Acc_num	Transaction_type_out
2156	1 Cash deposit 3 Pin change
8463	2 Cash Withdraw 4 Balance enquiry 1 Cash deposit

Solution:

Step 1: Sort the input records based on Acc_num

Step 2: Create a variable (v_type) in expression transformation to concatenate Transaction_type_id and Transaction_type: Transaction_type_id || Transaction_type.

Step 3: Create another variable holding the value of v_type (v_type_curr) and another variable to hold the value of previous v_type (v_type_prev). loop through the Acc_num and as long as it reads the same Acc_num, output Transaction_type_out (Target column) = v_type_curr || v_type_prev.

Transformations to be used:
SQ/Sorter for step 1
Expression for step 2

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