03_Data Transformation – Variablz Academy

Skip to content

Variablz Academy

Step into High-Paying AI & Analytics Careers

Home
Blog
Interview Prep

Variablz Academy

Step into High-Paying AI & Analytics Careers

Power BI Essentials

117

Data Extraction
Data Transformation
Data Modeling
Data Visualization
Dashboard Building
Performance Optimization
Project Knowledge
Domain Knowledge

SQL

153

Basics
Queries
Joins
Functions
Subqueries
DML
DDL
DCL/TCL
Indexes and Performance
Stored Procedures
Views
- What is a VIEW in SQL?
Window Funcions
Date and Time
- How do you retrieve the current date and time in SQL?
- How do you write a SQL query to find all employees who joined in the last 6 months?
Error Handling
- How do you handle error handling in stored procedures?
Best Practices
- How can you avoid SQL injection attacks?
Architecture
Data Warehousing
- What is data warehousing, and how is it different from transactional databases?
Distributed Systems
Replication | Backup | Recovery
Normalization
Security
- How can you avoid SQL injection attacks?
Common Table Expression (CTE)
- What are recursive queries, and how can they be used?
- What is the WITH clause used for in SQL?
Performance
Modeling
Admin
Concurrency

Data Analysis Expression (DAX)

29

DAX Basics
DAX Functions
- What is the difference between SUM and SUMX?
- What is the use of the DIVIDE function?
Measures
- What is a measure in DAX?
Row Context
- How does the EARLIER Function work?
- What is a row context in DAX?
Filter Context
- What is a filter context in DAX?
- What is the difference between CALCULATEand CALCULATE TABLE?
Context Transition
- How does the EARLIER Function work?
- What is the difference between CALCULATEand CALCULATE TABLE?
Time Intelligence
- How do you calculate a running total in DAX?
- How does the SAME PERIOD LAST YEAR function work?
Table Functions
Iterator Functions
- How does the RANKX function work?
- What is the difference between SUM and SUMX?
Relationship
Performance Optimization
Advanced DAX Patterns

Dart & Flutter

107

Asynchronous Programming
Build System
- How do you configure custom build systems in Dart?
Collections
Compilation
- How does Dart manage compilation and deployment for mobile (Flutter) apps?
- How does Dart’s just-in-time (JIT) and ahead-of-time (AOT) compilation work?
Concurrency
Conditional Statements
- How do you write a switch-case statement in Dart?
Data Types
- How do you interact with SQLite in Dart, and what packages do you use?
Debugging & Profiling
- Can you describe a time when you had to debug a complex issue in Dart?
- How would you approach debugging performance bottlenecks in Dart applications?
Dependency Injection
- 02_Can you explain how dependency injection works in Dart?
- How do you implement Dependency Injection (DI) in Dart?
Design Patterns
- How do you define a singleton pattern in Dart?
- How do you implement a factory pattern in Dart?
Exception Handling
FFI
File Handling
- How do you perform file I/O operations in Dart?
- How does the dart:io library interact with files in Dart?
Flutter Animations
- How do you implement complex animations in Flutter using Dart?
Flutter Async Widgets
- How do you use StreamBuilder in Flutter to handle data streams?
- What is a FutureBuilder widget in Flutter (Dart)?
Flutter Widgets
- Can you describe how you would implement a custom widget in Flutter using Dart?
Functional Programming
Generics
- How do you handle generics in Dart?
Internationalization
- How do you handle internationalization and localization in Flutter/Dart?
Language Features
- What are extension methods in Dart, and when should you use them?
Loop Control Statement
- How do you write a basic for loop in Dart?
- What is the difference between for and while loops in Python?
Memory Management
Mixins
Networking
- How can you perform HTTP requests in Dart?
- What is the difference between http and dio package in Flutter/Dart?
Null Safety
Object Oriented Programming
Operators
- What is the difference between == and identical() in Dart?
Package Management
- How do you manage and version your Dart dependencies using pubspec.yaml?
Performance Optimization
Program Structure
- How does the Dart VM differ from the JavaScript VM (in the context of Flutter)?
State Management
Type Checking
Type System
Variables
Web Programming
- Can you explain the concept of dart:html and how Dart interacts with the web?

Python Programming

70

Advanced Functions
- What is decorator in python?
- What is lambda function?
Built-in Functions
Coding Standards
- What is the use of pep 8 in python?
Collections
Comprehensions
- What are Python comprehensions?
- What is list comprehension in Python?
Concurrency
- What is the Global Interpreter Lock (GIL) in Python?
- What is the Global Interpreter Lock (GIL) in Python?
Conditional Statements
- What are control statements in Python?
- What is a ternary operator in Python?
Data Types
Environment Setup
- What is PYTHON PATH?
Exception Handling
- How do you handle exceptions in Python?
File Handling
- How can you handle file operations in Python?
- What is the with statement(Context Manager) in Python and why is it used?
Functional Programming
Functions
Generators
- What is the difference between yield and return in Python?
Introduction
Iterators
- What are Python iterators?
Loop Control Statement
- What is the use of the break, continue, and pass statements in Python?
Memory Management
- How does memory management work in Python?
- What is the difference between deepcopy() and copy()?
Modules
OOPS
Operators
- What is the difference between is and == in Python?
Program Execution
- What is the if name == ‘main’ statement used for?
Type Hints
- What are Python annotations?

Business Analyst

585

09_Business Scenario
01_Fundamentals
02_Data Extraction
03_Data Transformation
04_Data Modeling
05_Data Visualization
06_Dashboard Building
07_Performance Optimization
08_Advanced Analytics

App Developer

2

08_Advanced Development
- How is advanced analytics different from basic reporting?
- What types of business problems require advanced analytics?

View Categories

Home
Interview Questions
Business Analyst
03_Data Transformation

03_Data Transformation

How does poor transformation affect reporting accuracy?
What are common data quality issues addressed during transformation?
What are common string transformation operations?
What does data transformation mean in analytics projects?
What is append queries during transformation?
What is Applied Steps in Power Query?
What is business rule implementation during transformation?
What is calculated column conceptually?
What is case standardization in text fields?
What is CASE WHEN logic in SQL used for?

1
2
3
...
7
❯

Copyright © 2026 Variablz Academy

17, Nanban Nagar, Kammiyampet, Cuddalore-02.

Scroll to Top

Website security powered by MilesWeb