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5 frequently Asked SQL Interview Questions with Answers in Data Engineering interviews:
𝐃𝐢𝐟𝐟𝐢𝐜𝐮𝐥𝐭𝐲 - 𝐌𝐞𝐝𝐢𝐮𝐦

⚫️Determine the Top 5 Products with the Highest Revenue in Each Category.
Schema: Products (ProductID, Name, CategoryID), Sales (SaleID, ProductID, Amount)

WITH ProductRevenue AS (
SELECT p.ProductID,
p.Name,
p.CategoryID,
SUM(s.Amount) AS TotalRevenue,
RANK() OVER (PARTITION BY p.CategoryID ORDER BY SUM(s.Amount) DESC) AS RevenueRank
FROM Products p
JOIN Sales s ON p.ProductID = s.ProductID
GROUP BY p.ProductID, p.Name, p.CategoryID
)
SELECT ProductID, Name, CategoryID, TotalRevenue
FROM ProductRevenue
WHERE RevenueRank <= 5;

⚫️ Identify Employees with Increasing Sales for Four Consecutive Quarters.
Schema: Sales (EmployeeID, SaleDate, Amount)

WITH QuarterlySales AS (
SELECT EmployeeID,
DATE_TRUNC('quarter', SaleDate) AS Quarter,
SUM(Amount) AS QuarterlyAmount
FROM Sales
GROUP BY EmployeeID, DATE_TRUNC('quarter', SaleDate)
),
SalesTrend AS (
SELECT EmployeeID,
Quarter,
QuarterlyAmount,
LAG(QuarterlyAmount, 1) OVER (PARTITION BY EmployeeID ORDER BY Quarter) AS PrevQuarter1,
LAG(QuarterlyAmount, 2) OVER (PARTITION BY EmployeeID ORDER BY Quarter) AS PrevQuarter2,
LAG(QuarterlyAmount, 3) OVER (PARTITION BY EmployeeID ORDER BY Quarter) AS PrevQuarter3
FROM QuarterlySales
)
SELECT EmployeeID, Quarter, QuarterlyAmount
FROM SalesTrend
WHERE QuarterlyAmount > PrevQuarter1 AND PrevQuarter1 > PrevQuarter2 AND PrevQuarter2 > PrevQuarter3;

⚫️ List Customers Who Made Purchases in Each of the Last Three Years.
Schema: Orders (OrderID, CustomerID, OrderDate)

WITH YearlyOrders AS (
SELECT CustomerID,
EXTRACT(YEAR FROM OrderDate) AS OrderYear
FROM Orders
GROUP BY CustomerID, EXTRACT(YEAR FROM OrderDate)
),
RecentYears AS (
SELECT DISTINCT OrderYear
FROM Orders
WHERE OrderDate >= CURRENT_DATE - INTERVAL '3 years'
),
CustomerYearlyOrders AS (
SELECT CustomerID,
COUNT(DISTINCT OrderYear) AS YearCount
FROM YearlyOrders
WHERE OrderYear IN (SELECT OrderYear FROM RecentYears)
GROUP BY CustomerID
)
SELECT CustomerID
FROM CustomerYearlyOrders
WHERE YearCount = 3;


⚫️ Find the Third Lowest Price for Each Product Category.
Schema: Products (ProductID, Name, CategoryID, Price)

WITH RankedPrices AS (
SELECT CategoryID,
Price,
DENSE_RANK() OVER (PARTITION BY CategoryID ORDER BY Price ASC) AS PriceRank
FROM Products
)
SELECT CategoryID, Price
FROM RankedPrices
WHERE PriceRank = 3;

⚫️ Identify Products with Total Sales Exceeding a Specified Threshold Over the Last 30 Days.
Schema: Sales (SaleID, ProductID, SaleDate, Amount)

WITH RecentSales AS (
SELECT ProductID,
SUM(Amount) AS TotalSales
FROM Sales
WHERE SaleDate >= CURRENT_DATE - INTERVAL '30 days'
GROUP BY ProductID
)
SELECT ProductID, TotalSales
FROM RecentSales
WHERE TotalSales > 200;

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Important Data Engineering Concepts for Interviews

1. ETL Processes: Understand the ETL (Extract, Transform, Load) process, including how to design and implement efficient pipelines to move data from various sources to a data warehouse or data lake. Familiarize yourself with tools like Apache NiFi, Talend, and AWS Glue.

2. Data Warehousing: Know the fundamentals of data warehousing, including the star schema, snowflake schema, and how to design a data warehouse that supports efficient querying and reporting. Learn about popular data warehousing solutions like Amazon Redshift, Google BigQuery, and Snowflake.

3. Data Modeling: Master data modeling concepts, including normalization and denormalization, to design databases that are optimized for both read and write operations. Understand entity-relationship (ER) diagrams and how to use them to model data relationships.

4. Big Data Technologies: Gain expertise in big data frameworks like Apache Hadoop and Apache Spark for processing large datasets. Understand the roles of HDFS, MapReduce, Hive, and Pig in the Hadoop ecosystem, and how Spark’s in-memory processing can accelerate data processing.

5. Data Lakes: Learn about data lakes as a storage solution for raw, unstructured, and semi-structured data. Understand the key differences between data lakes and data warehouses, and how to use tools like Apache Hudi and Delta Lake to manage data lakes efficiently.

6. SQL and NoSQL Databases: Be proficient in SQL for querying and managing relational databases like MySQL, PostgreSQL, and Oracle. Also, understand when and how to use NoSQL databases like MongoDB, Cassandra, and DynamoDB for storing and querying unstructured or semi-structured data.

7. Data Pipelines: Learn how to design, build, and manage data pipelines that automate the flow of data from source systems to target destinations. Familiarize yourself with orchestration tools like Apache Airflow, Luigi, and Prefect for managing complex workflows.

8. APIs and Data Integration: Understand how to integrate data from various APIs and third-party services into your data pipelines. Learn about RESTful APIs, GraphQL, and how to handle data ingestion from external sources securely and efficiently.

9. Data Streaming: Gain knowledge of real-time data processing using streaming technologies like Apache Kafka, Apache Flink, and Amazon Kinesis. Learn how to build systems that can process and analyze data in real time as it flows through the system.

10. Cloud Platforms: Get familiar with cloud-based data engineering services offered by AWS, Azure, and Google Cloud. Understand how to use services like AWS S3, Azure Data Lake, Google Cloud Storage, AWS Redshift, and BigQuery for data storage, processing, and analysis.

11. Data Governance and Security: Learn best practices for data governance, including how to implement data quality checks, lineage tracking, and metadata management. Understand data security concepts like encryption, access control, and GDPR compliance to protect sensitive data.

12. Automation and Scripting: Be proficient in scripting languages like Python, Bash, or PowerShell to automate repetitive tasks, manage data pipelines, and perform ad-hoc data processing.

13. Data Versioning and Lineage: Understand the importance of data versioning and lineage for tracking changes to data over time. Learn how to use tools like Apache Atlas or DataHub for managing metadata and ensuring traceability in your data pipelines.

14. Containerization and Orchestration: Learn how to deploy and manage data engineering workloads using containerization tools like Docker and orchestration platforms like Kubernetes. Understand the benefits of using containers for scaling and maintaining consistency across environments.

15. Monitoring and Logging: Implement logging for data pipelines to ensure they run smoothly and efficiently. Familiarize yourself with tools like Prometheus, Grafana, etc. for real-time monitoring and troubleshooting.

Pyspark Interview Questions!!


Interviewer: "How would you remove duplicates from a large dataset in PySpark?"

Candidate: "To remove duplicates from a large dataset in PySpark, I would follow these steps:

Step 1: Load the dataset into a DataFrame

df = spark.read.csv("path/to/data.csv", header=True, inferSchema=True)

Step 2: Check for duplicates

duplicate_count = df.count() - df.dropDuplicates().count()
print(f"Number of duplicates: {duplicate_count}")

Step 3: Partition the data to optimize performance
df_repartitioned = df.repartition(100)
Step 4: Remove duplicates using the dropDuplicates() method
df_no_duplicates = df_repartitioned.dropDuplicates()
Step 5: Cache the resulting DataFrame to avoid recomputing
df_no_duplicates.cache()
Step 6: Save the cleaned dataset

df_no_duplicates.write.csv("path/to/cleaned/data.csv", header=True)

Interviewer: "That's correct! Can you explain why you partitioned the data in Step 3?"

Candidate: "Yes, partitioning the data helps to distribute the computation across multiple nodes, making the process more efficient and scalable."

Interviewer: "Great answer! Can you also explain why you cached the resulting DataFrame in Step 5?"

Candidate: "Caching the DataFrame avoids recomputing the entire dataset when saving the cleaned data, which can significantly improve performance."

Interviewer: "Excellent! You have demonstrated a clear understanding of optimizing duplicate removal in PySpark."

𝗜𝗕𝗠 𝗙𝗥𝗘𝗘 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗖𝗼𝘂𝗿𝘀𝗲𝘀 😍

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How to become a data analyst/engineer -

Practice these daily:

➡️ SQL
➡️ Excel
➡️ Python
➡️ Power BI
➡️ ETL/ELT
➡️ Power Query
➡️ Data modelling
➡️ Data warehouse
➡️ Exception handling
➡️ Logging + debugging

#DataEngineering

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Pyspark interview questions for Data Engineer

1. How do you handle data transfer between PySpark and external systems? 2. How do you deal with missing or null values in PySpark DataFrames?
3. Are there any specific strategies or functions you prefer for handling missing data?
4. What is broadcasting, and how is it useful in PySpark?
5. What is Spark and why is it preferred over MapReduce?
6. How does Spark handle fault tolerance?
7. What is the significance of caching in Spark?
8. Explain the concept of broadcast variables in Spark
9. What is the role of Spark SQL in data processing?
10. How does Spark handle memory management?
11. Discuss the significance of partitioning in Spark.
12. Explain the difference between RDDs, DataFrames, and Datasets.
13. What are the different deployment modes available in Spark?
14. What is PySpark, and how does it differ from Python Pandas?
15. Explain the difference between RDD, DataFrame, and Dataset in PySpark. 16. How do you create a DataFrame in PySpark?
17. What is lazy evaluation in PySpark and why is it important?
18. How can you handle missing or null values in PySpark DataFrames?
19. What are transformations and actions in PySpark, and can you give examples of each?
20. How do you perform joins between two DataFrames in PySpark? What are the joins available in PySpark?

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DATA SCIENTIST vs DATA ENGINEER vs DATA ANALYST

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- get a Snowflake or BigQuery free trial account.  Update the Python script to dump the data there

- build aggregations on top of the data in SQL using things like GROUP BY keyword

- set up an Astronomer account to build an Airflow pipeline to automate this data  ingestion

- connect something like Tableau to your data warehouse and build a fancy chart that updates to show off your hard work!

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𝗚𝗼𝗼𝗴𝗹𝗲’𝘀 𝗙𝗥𝗘𝗘 𝗠𝗮𝗰𝗵𝗶𝗻𝗲 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗖𝗼𝘂𝗿𝘀𝗲😍

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➤ 𝗣𝗿𝗲-𝗿𝗲𝗾𝘂𝗶𝘀𝗶𝘁𝗲𝘀
- SQL is very important
- Learn Python Funddamentals

➤ 𝗢𝗻-𝗣𝗿𝗲𝗺 𝘁𝗼𝗼𝗹𝘀
- Learn Pyspark - In Depth (Processing tool)
- Hadoop (Distrubuted Storage)
- Hive (Datawarehouse)
- Airflow (Orchestration)
- Kafka (Streaming platform)
- CICD for production readiness

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What fundamental axioms and unchangeable principles exist in data engineering and data modeling?

Consider Euclidean geometry as an example. It's an axiomatic system, built on universal "true statements" that define the entire field. For instance, "a line can be drawn between any two points" or "all right angles are equal." From these basic axioms, all other geometric principles can be derived.

So, what are the axioms of data engineering and data modeling?

I asked ChatGPT about that and it gave this list:
▪️ Data exists in multiple forms and formats
▪️ Data can and should be transformed to serve the needs
▪️ Data should be trustworthy
▪️ Data systems should be efficient and scalable

Classic ChatGPT, pretty standard, pretty boring 🥱. Yes, these are universal and fundamental rules, but what can we learn from them?

Here is what I'd call axioms for myself:
🔹 Every table should have a primary key which is unique and not empty (dbt tests for life 🙂)
🔹 Every column should have strong types and constraints (storing data as STRING or JSON is ouch)
🔹 Data pipelines should be idempotent (I don't want to deal with duplicates and inconsistencies)
🔹 Every data transformation has to be defined in code (otherwise what are we doing here)

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Here are few Interview questions that are often asked in PySpark interviews to evaluate if candidates have hands-on experience or not !!

𝐋𝐞𝐭𝐬 𝐝𝐢𝐯𝐢𝐝𝐞 𝐭𝐡𝐞 𝐪𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬 𝐢𝐧 4 𝐩𝐚𝐫𝐭𝐬

1. Data Processing and Transformation
2. Performance Tuning and Optimization
3. Data Pipeline Development
4. Debugging and Error Handling

𝐃𝐚𝐭𝐚 𝐏𝐫𝐨𝐜𝐞𝐬𝐬𝐢𝐧𝐠 𝐚𝐧𝐝 𝐓𝐫𝐚𝐧𝐬𝐟𝐨𝐫𝐦𝐚𝐭𝐢𝐨𝐧:

1. Explain how you would handle large datasets in PySpark. How do you optimize a PySpark job for performance?
2. How would you join two large datasets (say 100GB each) in PySpark efficiently?
3. Given a dataset with millions of records, how would you identify and remove duplicate rows using PySpark?
4. You are given a DataFrame with nested JSON. How would you flatten the JSON structure in PySpark?
5. How do you handle missing or null values in a DataFrame? What strategies would you use in different scenarios?

𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐓𝐮𝐧𝐢𝐧𝐠 𝐚𝐧𝐝 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧:

6. How do you debug and optimize PySpark jobs that are taking too long to complete?
7. Explain what a shuffle operation is in PySpark and how you can minimize its impact on performance.
8. Describe a situation where you had to handle data skew in PySpark. What steps did you take?
9. How do you handle and optimize PySpark jobs in a YARN cluster environment?
10. Explain the difference between repartition() and coalesce() in PySpark. When would you use each?

𝐃𝐚𝐭𝐚 𝐏𝐢𝐩𝐞𝐥𝐢𝐧𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭:

11. Describe how you would implement an ETL pipeline in PySpark for processing streaming data.
12. How do you ensure data consistency and fault tolerance in a PySpark job?
13. You need to aggregate data from multiple sources and save it as a partitioned Parquet file. How would you do this in PySpark?
14. How would you orchestrate and manage a complex PySpark job with multiple stages?
15. Explain how you would handle schema evolution in PySpark while reading and writing data.

𝐃𝐞𝐛𝐮𝐠𝐠𝐢𝐧𝐠 𝐚𝐧𝐝 𝐄𝐫𝐫𝐨𝐫 𝐇𝐚𝐧𝐝𝐥𝐢𝐧𝐠:

16. Have you encountered out-of-memory errors in PySpark? How did you resolve them?
17. What steps would you take if a PySpark job fails midway through execution? How do you recover from it?
18. You encounter a Spark task that fails repeatedly due to data corruption in one of the partitions. How would you handle this?
19. Explain a situation where you used custom UDFs (User Defined Functions) in PySpark. What challenges did you face, and how did you overcome them?
20. Have you had to debug a PySpark (Python + Apache Spark) job that was producing incorrect results?

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Pre-Interview Checklist for Big Data Engineer Roles.

➤ SQL Essentials:
- SELECT statements including WHERE, ORDER BY, GROUP BY, HAVING
- Basic JOINS: INNER, LEFT, RIGHT, FULL
- Aggregate functions: COUNT, SUM, AVG, MAX, MIN
- Subqueries, Common Table Expressions (WITH clause)
- CASE statements, advanced JOIN techniques, and Window functions (OVER, PARTITION BY, ROW_NUMBER, RANK)

➤ Python Programming:
- Basic syntax, control structures, data structures (lists, dictionaries)
- Pandas & NumPy for data manipulation: DataFrames, Series, groupby

➤ Hadoop Ecosystem Proficiency:
- Understanding HDFS architecture, replication, and block management.
- Mastery of MapReduce for distributed data processing.
- Familiarity with YARN for resource management and job scheduling.

➤ Hive Skills:
- Writing efficient HiveQL queries for data retrieval and manipulation.
- Optimizing table performance with partitioning and bucketing.
- Working with ORC, Parquet, and Avro file formats.

➤ Apache Spark:
- Spark architecture
- RDD, Dataframe, Datasets, Spark SQL
- Spark optimization techniques
- Spark Streaming

➤ Apache HBase:
- Designing effective row keys and understanding HBase’s data model.
- Performing CRUD operations and integrating HBase with other big data tools.

➤ Apache Kafka:
- Deep understanding of Kafka architecture, including producers, consumers, and brokers.
- Implementing reliable message queuing systems and managing data streams.
- Integrating Kafka with ETL pipelines.

➤ Apache Airflow:
- Designing and managing DAGs for workflow scheduling.
- Handling task dependencies and monitoring workflow execution.

➤ Data Warehousing and Data Modeling:
- Concepts of OLAP vs. OLTP
- Star and Snowflake schema designs
- ETL processes: Extract, Transform, Load
- Data lake vs. data warehouse
- Balancing normalization and denormalization in data models.

➤ Cloud Computing for Data Engineering:
- Benefits of cloud services (AWS, Azure, Google Cloud)
- Data storage solutions: S3, Azure Blob Storage, Google Cloud Storage
- Cloud-based data analytics tools: BigQuery, Redshift, Snowflake
- Cost management and optimization strategies

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𝗦𝘁𝗿𝘂𝗴𝗴𝗹𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗣𝗼𝘄𝗲𝗿 𝗕𝗜? 𝗧𝗵𝗶𝘀 𝗖𝗵𝗲𝗮𝘁 𝗦𝗵𝗲𝗲𝘁 𝗶𝘀 𝗬𝗼𝘂𝗿 𝗨𝗹𝘁𝗶𝗺𝗮𝘁𝗲 𝗦𝗵𝗼𝗿𝘁𝗰𝘂𝘁!😍

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