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ZS ETL Developer Interview Questions, Process, and Tips

Updated 2 Feb 2025

Top ZS ETL Developer Interview Questions and Answers

  • Q1. What is the process flow of Slowly Changing Dimension Type 2 (SCD 2), and what are the associated post commands?
  • Q2. What is the SQL query using PIVOT to transform the given input table into the expected output?
  • Q3. What is the process flow for implementing an incremental load?

ZS ETL Developer Interview Experiences

3 interviews found

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I was interviewed before Feb 2024.

Round 1 - Technical 

(5 Questions)

  • Q1. What is the SQL query using PIVOT to transform the given input table into the expected output?
  • Ans. 

    Using PIVOT in SQL to transform input table into expected output

    • Use the PIVOT keyword followed by the aggregation function and column to pivot on

    • Specify the values to pivot on as columns in the output table

    • Include the FOR clause to specify the values to pivot on

    • Example: SELECT * FROM input_table PIVOT (SUM(value) FOR category IN ('A', 'B', 'C')) AS output_table

  • Answered by AI
  • Q2. What is the process flow for implementing an incremental load?
  • Ans. 

    Incremental load process flow involves identifying new/updated data, extracting, transforming, and loading it into the target system.

    • Identify the source data that has changed since the last load

    • Extract only the new/updated data from the source system

    • Transform the data as needed (e.g. applying business rules, data cleansing)

    • Load the transformed data into the target system, either appending to existing data or updating e

  • Answered by AI
  • Q3. What are the steps involved in query optimization?
  • Ans. 

    Query optimization involves steps to improve the performance of database queries.

    • Identify slow queries using tools like query logs or profiling.

    • Analyze query execution plans to understand how queries are being processed.

    • Optimize queries by adding indexes, rewriting queries, or restructuring data.

    • Consider factors like data distribution, join types, and query complexity.

    • Test and benchmark optimized queries to ensure perf

  • Answered by AI
  • Q4. What is the process flow of Slowly Changing Dimension Type 2 (SCD 2), and what are the associated post commands?
  • Ans. 

    SCD Type 2 is used to track historical changes in data by creating new records for changes.

    • Identify changes in source data

    • Insert new record with updated data

    • Update end date of previous record

    • Add post commands like updating flags or triggers

    • Example: If a customer changes their address, a new record is created with the updated address while the previous record is marked as expired.

  • Answered by AI
  • Q5. Difference Between dimension tables and fact tables.Which one loaded firs?
  • Ans. 

    Dimension tables store descriptive attributes while fact tables store quantitative data. Dimension tables are loaded first.

    • Dimension tables contain attributes like customer name, product category, etc.

    • Fact tables contain quantitative data like sales revenue, quantity sold, etc.

    • Dimension tables are typically loaded first as they provide context for the quantitative data in fact tables.

  • Answered by AI

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ETL Developer Interview Questions & Answers

user image Aatmikta Sirothiya

posted on 25 Oct 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Situation based questions, by giving some data and about the dedup logic by using sql

ETL Developer Interview Questions Asked at Other Companies

asked in Ciber
Q1. What are the content of APT_CONFIG_FILE? Can you brief on the rel ... read more
asked in ZS
Q2. What is the process flow of Slowly Changing Dimension Type 2 (SCD ... read more
asked in Ciber
Q3. What is RCP? In What scenario you have used this in your project?
Q4. What is trigger . Do Implementation of types of trigger?
asked in Ciber
Q5. What are the methods available in Aggregator stage?

ETL Developer Interview Questions & Answers

user image Anonymous

posted on 19 Sep 2024

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Job Portal and was interviewed in Mar 2024. There was 1 interview round.

Round 1 - Coding Test 

On the sql, python and other puzzles

Interview Preparation Tips

Interview preparation tips for other job seekers - asked on the sql problems like joins, group, window function, database and warehouse diff

ETL Developer Jobs at ZS

View all

Interview questions from similar companies

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Campus Placement and was interviewed before Jan 2022. There were 4 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all Resume tips
Round 2 - Assignment 

It's an assignment for apti, verbal

Round 3 - Technical 

(1 Question)

  • Q1. It's like an what are u mentioned in resume skills.
Round 4 - HR 

(1 Question)

  • Q1. Just like interaction with candidate like personal details.

Interview Preparation Tips

Interview preparation tips for other job seekers - Be prepare on what u mentioned in resume skills and self confidence..

I applied via Naukri.com and was interviewed in Mar 2022. There was 1 interview round.

Round 1 - Technical 

(1 Question)

  • Q1. Oracle DWH concept Informatica

Interview Preparation Tips

Interview preparation tips for other job seekers - Just apply .you may not be the best candidate or have all the require qulification ,but you 'll never
get a job you don't try
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Naukri.com and was interviewed in Dec 2023. There was 1 interview round.

Round 1 - Technical 

(1 Question)

  • Q1. Explain the difference between ETL and ELT?
  • Ans. 

    ETL is Extract, Transform, Load where data is extracted, transformed, and loaded into a data warehouse. ELT is Extract, Load, Transform where data is extracted, loaded into a data warehouse, and then transformed.

    • ETL involves extracting data from source systems, transforming it according to business rules, and loading it into a data warehouse.

    • ELT involves extracting data from source systems, loading it into a data wareh...

  • Answered by AI

Skills evaluated in this interview

Interview experience
2
Poor
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. What is loads in informatica
  • Ans. 

    Loads in Informatica refer to the process of moving data from source to target in a data warehouse.

    • Loads involve extracting data from source systems

    • Transforming the data as needed

    • Loading the data into the target data warehouse or database

    • Loads can be full, incremental, or delta depending on the requirements

    • Example: Loading customer data from a CRM system into a data warehouse for analysis

  • Answered by AI
  • Q2. Query to find duplicates in table
  • Ans. 

    Use GROUP BY and HAVING clause to find duplicates in a table.

    • Use GROUP BY to group rows with same values together

    • Use HAVING COUNT(*) > 1 to filter out duplicates

    • Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name HAVING COUNT(*) > 1;

  • Answered by AI

Skills evaluated in this interview

ETL Developer Interview Questions & Answers

TCS user image Vikash Kumar

posted on 21 Oct 2024

Interview experience
5
Excellent
Difficulty level
Easy
Process Duration
-
Result
Selected Selected

I applied via Campus Placement and was interviewed before Oct 2023. There was 1 interview round.

Round 1 - Technical 

(2 Questions)

  • Q1. Lookup transformation
  • Q2. Joiner transformation
Interview experience
5
Excellent
Difficulty level
Hard
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed before Aug 2022. There were 3 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all Resume tips
Round 2 - Technical 

(1 Question)

  • Q1. Self introduction
Round 3 - HR 

(1 Question)

  • Q1. Package discussion
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed before Apr 2023. There was 1 interview round.

Round 1 - Technical 

(1 Question)

  • Q1. SQL query and informatica scenario based questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Learn data warehousing concepts, SQL query and informatica scenario based questions
Contribute & help others!
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ZS Interview FAQs

How many rounds are there in ZS ETL Developer interview?
ZS interview process usually has 1 rounds. The most common rounds in the ZS interview process are Technical and Coding Test.
How to prepare for ZS ETL Developer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at ZS. The most common topics and skills that interviewers at ZS expect are Business Intelligence, Cognos, ETL, ETL Informatica and Informatica.
What are the top questions asked in ZS ETL Developer interview?

Some of the top questions asked at the ZS ETL Developer interview -

  1. What is the process flow of Slowly Changing Dimension Type 2 (SCD 2), and what ...read more
  2. What is the SQL query using PIVOT to transform the given input table into the e...read more
  3. What is the process flow for implementing an incremental lo...read more

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ZS ETL Developer Interview Process

based on 5 interviews

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ZS ETL Developer Salary
based on 22 salaries
₹6 L/yr - ₹18.1 L/yr
82% more than the average ETL Developer Salary in India
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ZS ETL Developer Reviews and Ratings

based on 3 reviews

3.4/5

Rating in categories

3.7

Skill development

2.0

Work-life balance

4.3

Salary

3.4

Job security

4.6

Company culture

3.7

Promotions

3.3

Work satisfaction

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Etl Developer

Pune,

Gurgaon / Gurugram

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