Data Analyst Interview Resources
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Avoid directly copying YouTube projects onto your resume because if everyone looks the same, recruiters might discard resumes.

Instead, for eg, let's say you are working on a SQL case study, download a dataset from Kaggle (usually a CSV file), set up a Postgre/MySQL database, connect it with the data, and prompt ChatGPT with questions ranging from basic to advanced SQL.

Solve the questions step by step. When using PowerBI, connect to the database and create a compelling dashboard. Don't just upload the dataset; employ DAX queries, statistical functions, and avoid relying solely on drag-and-drop features. Use Formatting section to do creative stuff and add your unique element in the project.

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One of the most common interview question in #sql round. What is the order of execution of the below #query:

""""Query""""""

Select product_id,
product_rank
(
SELECT product_id,
rank() over(order by total_sales_amount desc) as product_rank
FROM sales_info
)
WHERE product_rank <= 5
order by product rank desc;
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๐Ÿฅณ๐Ÿš€When delving into data analytics and initiating your SQL journey, prioritize mastering the fundamental concepts that address the majority of problems before delving into other topics.

๐Ÿ‘‰๐Ÿป Basic Aggregation function:
1๏ธโƒฃ AVG
2๏ธโƒฃ COUNT
3๏ธโƒฃ SUM
4๏ธโƒฃ MIN
5๏ธโƒฃ MAX

๐Ÿ‘‰๐Ÿป JOINS
1๏ธโƒฃ Left
2๏ธโƒฃ Inner
3๏ธโƒฃ Self (Important, Practice questions on self join)

๐Ÿ‘‰๐Ÿป Windows Function (Important)
1๏ธโƒฃ Learn how partitioning works
2๏ธโƒฃ Learn the different use cases where Ranking/Numbering Functions are used? ( ROW_NUMBER,RANK, DENSE_RANK, NTILE)
3๏ธโƒฃ Use Cases of LEAD & LAG functions
4๏ธโƒฃ Use cases of Aggregate window functions

๐Ÿ‘‰๐Ÿป GROUP BY
๐Ÿ‘‰๐Ÿป WHERE vs HAVING
๐Ÿ‘‰๐Ÿป CASE STATEMENT
๐Ÿ‘‰๐Ÿป UNION vs Union ALL
๐Ÿ‘‰๐Ÿป LOGICAL OPERATORS

Other Commonly used functions:
๐Ÿ‘‰๐Ÿป IFNULL
๐Ÿ‘‰๐Ÿป COALESCE
๐Ÿ‘‰๐Ÿป ROUND
๐Ÿ‘‰๐Ÿป Working with Date Functions
1๏ธโƒฃ EXTRACTING YEAR/MONTH/WEEK/DAY
2๏ธโƒฃ Calculating date differences

๐Ÿ‘‰๐ŸปCTE
๐Ÿ‘‰๐ŸปViews & Triggers (optional)

Amazing resources to learn & practice SQL: https://t.iss.one/sqlanalyst/195

Hope it helps in your SQL learning ๐Ÿ“š
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Thank you so much everyone for the awesome response. I have created an entire checklist to learn SQL, Power BI, Excel, Python & Tableau.

You can access Free Checklist here.

Like this post if it helps ๐Ÿ‘โค๏ธ

I'll try bringing more resources like these in the future to help you as much as I can.

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To become a successful data analyst, you need a combination of technical skills, analytical skills, and soft skills. Here are some key skills required to excel in a data analyst role:

1. Statistical Analysis: Understanding statistical concepts and being able to apply them to analyze data sets is essential for a data analyst. Knowledge of probability, hypothesis testing, regression analysis, and other statistical techniques is important.

2. Data Manipulation: Proficiency in tools like SQL for querying databases and manipulating data is crucial. Knowledge of data cleaning, transformation, and preparation techniques is also important.

3. Data Visualization: Being able to create meaningful visualizations using tools like Tableau, Power BI, or Python libraries like Matplotlib and Seaborn is essential for effectively communicating insights from data.

4. Programming: Strong programming skills in languages like Python or R are often required for data analysis tasks. Knowledge of libraries like Pandas, NumPy, and scikit-learn in Python can be beneficial.

5. Machine Learning(optional): Understanding machine learning concepts and being able to apply algorithms for predictive modeling, clustering, and classification tasks is becoming increasingly important for data analysts.

6. Database Management: Knowledge of database systems like MySQL, PostgreSQL, or MongoDB is useful for working with large datasets and understanding how data is stored and retrieved.

7. Critical Thinking: Data analysts need to be able to think critically and approach problems analytically. Being able to identify patterns, trends, and outliers in data is important for drawing meaningful insights.

8. Business Acumen: Understanding the business context and objectives behind the data analysis is crucial. Data analysts should be able to translate data insights into actionable recommendations for business decision-making.

9. Communication Skills: Data analysts need to effectively communicate their findings to non-technical stakeholders. Strong written and verbal communication skills are essential for presenting complex data analysis results in a clear and understandable manner.

10. Continuous Learning: The field of data analysis is constantly evolving, so a willingness to learn new tools, techniques, and technologies is important for staying current and adapting to changes in the industry.

By developing these skills and gaining practical experience through projects or internships, you can build a strong portfolio for a successful career as a data analyst.
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NoSQL vs SQL

NoSQL databases provide flexible data models ideal for diverse data structures and scalability.

1. Key-Value: Simple, uses key-value pairs (e.g., Redis).
2. Document: Stores data in JSON/BSON documents (e.g., MongoDB).
3. Graph: Manages complex relationships with nodes and edges (e.g., Neo4j).
4. Column Store: Optimized for analytics, organizes data by columns (e.g., Cassandra).

SQL databases, like RDBMS and OLAP, provide structured, relational storage for traditional and analytical needs

1. RDBMS: Traditional relational databases with tables (e.g., PostgreSQL & MySQL).
2. OLAP: Designed for complex analysis and multidimensional data (e.g., SQL Server Analysis Services).
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Data Analyst Interview Questions.pdf
81.4 KB
Data Analyst Interview Questions
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What to do and What to avoid!

When sitting in front of an interviewer, your actions and words can make or break your chances.

Itโ€™s more than just answering questions, it's about presenting yourself as the ideal candidate.

Here are some clear do's and don'ts to keep in mind.

๐Ÿ“ŒDo:

1. Be Prepared.
2. Dress Appropriately.
3. Be Punctual.
4. Maintain Good Posture.
5. Listen Carefully.
6. Ask Thoughtful Questions.
7. Be Honest.

๐Ÿ“ŒDon't:

1. Donโ€™t Fidget.
2. Donโ€™t Speak Negatively About Past Employers.
3. Donโ€™t Interrupt.
4. Donโ€™t Overshare.
5. Donโ€™t Forget to Follow Up.

By keeping these dos and donโ€™ts in mind, youโ€™ll be better prepared to make a strong impression in your interview.

Good luck!

Hope this helps you ๐Ÿ˜Š
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Here are few Important SQL interview questions with topics

Basic SQL Concepts:

Explain the difference between SQL and NoSQL databases.
What are the common data types in SQL?

Querying:

How do you retrieve all records from a table named "Customers"?
What is the difference between SELECT and SELECT DISTINCT in a query?
Explain the purpose of the WHERE clause in SQL queries.

Joins:
Describe the types of joins in SQL (INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN).
How would you retrieve data from two tables using an INNER JOIN?

Aggregate Functions:
What are aggregate functions in SQL? Can you name a few?
How do you calculate the average, sum, and count of a column in a SQL query?

Grouping and Filtering:
Explain the GROUP BY clause and its use in SQL.
How would you filter the results of an SQL query using the HAVING clause?

Subqueries:
What is a subquery, and when would you use one in SQL?
Provide an example of a subquery in an SQL statement.

Indexes and Optimization:
Why are indexes important in a database?
How would you optimize a slow-running SQL query?

Normalization and Data Integrity:
What is database normalization, and why is it important?
How can you enforce data integrity in a SQL database?

Transactions:
What is a SQL transaction, and why would you use it?
Explain the concepts of ACID properties in database transactions.

Views and Stored Procedures:
What is a database view, and when would you create one?
What is a stored procedure, and how does it differ from a regular SQL query?

Advanced SQL:
Can you write a recursive SQL query, and when would you use recursion?
Explain the concept of window functions in SQL.

These questions cover a range of SQL topics, from basic concepts to more advanced techniques, and can help assess a candidate's knowledge and skills in SQL :)

Like this post if you need more ๐Ÿ‘โค๏ธ

Hope it helps :)
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How Data Analytics Helps to Grow Business to Best
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https://datasimplifier.com/data-analytics-helps-to-grow/
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Why is Excel Often the Starting Point for SQL ?


Here's how Excel can help you before you dive into SQL:

โœ”๏ธ ๐•๐‹๐Ž๐Ž๐Š๐”๐ = ๐’๐๐‹ ๐‰๐Ž๐ˆ๐๐’
In Excel, we use VLOOKUP to bring together data from different sheets. It's just like using JOINS in SQL to get data from more than one table.

โœ”๏ธ ๐’๐”๐Œ ๐š๐ง๐ ๐‚๐Ž๐”๐๐“ ๐Ÿ๐จ๐ซ ๐’๐๐‹ ๐๐ฎ๐ž๐ซ๐ข๐ž๐ฌ
Excel's SUM and COUNT functions are like practice for SQL queries. They help you add up and count things, which is what you often do in SQL.

โœ”๏ธ ๐…๐ˆ๐‹๐“๐„๐‘ ๐’๐ญ๐š๐ญ๐ž๐ฆ๐ž๐ง๐ญ๐ฌ & ๐–๐‡๐„๐‘๐„ ๐ข๐ง ๐’๐๐‹
Excel's ๐…๐ˆ๐‹๐“๐„๐‘ statements let you make choices with your data. This is similar to using WHERE in SQL to pick specific data.

โœ”๏ธ ๐‡๐š๐ง๐๐ฅ๐ข๐ง๐  ๐ƒ๐š๐ญ๐ž๐ฌ ๐š๐ง๐ ๐“๐ž๐ฑ๐ญ
Both Excel and SQL have ways to work with dates and text. Learning these in Excel first can make it easier when you switch to SQL.

โœ”๏ธ ๐๐ข๐ฏ๐จ๐ญ ๐“๐š๐›๐ฅ๐ž๐ฌ & ๐†๐‘๐Ž๐”๐ ๐๐˜ ๐ข๐ง ๐’๐๐‹
Ever used pivot tables in Excel? They're a good start for understanding the GROUP BY function in SQL, which helps you organize and summarize data.

โœ”๏ธ ๐—๐‹๐Ž๐Ž๐Š๐”๐ & ๐‡๐ฒ๐ฉ๐ž๐ซ๐ฅ๐ข๐ง๐ค๐ฌ
Excel's XLOOKUP and hyperlinks are like SQL's ways of finding and linking data. They give you a peek into how SQL finds and connects information.

Learning Excel first makes SQL easier to understand. It's not just about learning a tool, it's about getting ready for the bigger world of data!

You will be asked questions on SQL in interviews for sure! Make sure to practice 2-3 questions daily, it can't be mastered overnight!

Share our channel link with your true friends: https://t.iss.one/excel_analyst

Hope this helps you ๐Ÿ˜Š
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Free Programming and Data Analytics Resources ๐Ÿ‘‡๐Ÿ‘‡

โœ… Data science and Data Analytics Free Courses by Google

https://developers.google.com/edu/python/introduction

https://grow.google/intl/en_in/data-analytics-course/?tab=get-started-in-the-field

https://cloud.google.com/data-science?hl=en

https://developers.google.com/machine-learning/crash-course

https://t.iss.one/datasciencefun/1371

๐Ÿ” Free Data Analytics Courses by Microsoft

1. Get started with microsoft dataanalytics
https://learn.microsoft.com/en-us/training/paths/data-analytics-microsoft/

2. Introduction to version control with git
https://learn.microsoft.com/en-us/training/paths/intro-to-vc-git/

3. Microsoft azure ai fundamentals
https://learn.microsoft.com/en-us/training/paths/get-started-with-artificial-intelligence-on-azure/

๐Ÿค– Free AI Courses by Microsoft

1. Fundamentals of AI by Microsoft

https://learn.microsoft.com/en-us/training/paths/get-started-with-artificial-intelligence-on-azure/

2. Introduction to AI with python by Harvard.

https://pll.harvard.edu/course/cs50s-introduction-artificial-intelligence-python

๐Ÿ“š Useful Resources for the Programmers

Data Analyst Roadmap
https://t.iss.one/sqlspecialist/94

Free C course from Microsoft
https://docs.microsoft.com/en-us/cpp/c-language/?view=msvc-170&viewFallbackFrom=vs-2019

Interactive React Native Resources
https://fullstackopen.com/en/part10

Python for Data Science and ML
https://t.iss.one/datasciencefree/68

Ethical Hacking Bootcamp
https://t.iss.one/ethicalhackingtoday/3

Unity Documentation
https://docs.unity3d.com/Manual/index.html

Advanced Javascript concepts
https://t.iss.one/Programming_experts/72

Oops in Java
https://nptel.ac.in/courses/106105224

Intro to Version control with Git
https://docs.microsoft.com/en-us/learn/modules/intro-to-git/0-introduction

Python Data Structure and Algorithms
https://t.iss.one/programming_guide/76

Free PowerBI course by Microsoft
https://docs.microsoft.com/en-us/users/microsoftpowerplatform-5978/collections/k8xidwwnzk1em

Data Structures Interview Preparation
https://t.iss.one/crackingthecodinginterview/309?single

๐Ÿป Free Programming Courses by Microsoft

โฏ JavaScript
https://learn.microsoft.com/training/paths/web-development-101/

โฏ TypeScript
https://learn.microsoft.com/training/paths/build-javascript-applications-typescript/

โฏ C#
https://learn.microsoft.com/users/dotnet/collections/yz26f8y64n7k07

Join @free4unow_backup for more free resources.

ENJOY LEARNING ๐Ÿ‘๐Ÿ‘
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