Thursday, October 13, 2011

Informatica Question: Given a transaction log in which each line contains a transaction detail (Customer Id, Customer name, Price), Find out the average price given by a customer.


1. Read each line, extract customer id and price.

2. Maintain a hash in which key is customer id and value is pointer to struct defined as below -
    struct details
       long totalPrice;
       int count;

3. For each transaction do
    i.  hash[customerId]->totalPrice += extractedPrice;
    ii. hash[customerId]->count++;

4. Now for given customer, average price = hash[customerId]->totalPrice / hash[customerId]->count;

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