Welcome to the Future – AI Hints Today
Keyword is AI– This is your go-to space to ask questions, share programming tips, and engage with fellow coding enthusiasts. Whether you’re a beginner or an expert, our community is here to support your journey in coding. Dive into discussions on various programming languages, solve challenges, and exchange knowledge to enhance your skills.
SQL Tricky Conceptual Interview Questions
Perfect—now I understand! You’re looking for tricky, high-quality SQL interview questions like: “What’s the difference between DELETE, DROP, and TRUNCATE?” These are concept-based, real-world, and interview-style—not just syntax exercises. 🔥 Top Tricky SQL Interview Questions (with Answers) Below is a carefully curated list covering real-world understanding, edge cases, performance, and design: ✅ 1. What is…
Data Engineer Interview Questions Set4
Perfect! Here’s everything inline, right in this window: ✅ Part 1: Spark Cluster Simulation Notebook (Inline Code) This Jupyter/Databricks notebook simulates how Spark behaves across cluster components: 🧠 Use .explain(True) at any step to inspect execution plan. ✅ Part 2: Spark Execution Flow — Mindmap Style Summary (Inline) ✅ Optional: Mindmap Format You Can Copy…
Data Engineer Interview Questions Set3
Let’s visualize how Spark schedules tasks when reading files (like CSV, Parquet, or from Hive), based on: ⚙️ Step-by-Step: How Spark Schedules Tasks from Files 🔹 Step 1: Spark reads file metadata When you call: 🔹 Step 2: Input Splits → Tasks File Size Block Size Input Splits Resulting Tasks 1 file, 1 GB 128…
Data Engineer Interview Questions Set2
Let’s directly compare Partitioning vs Bucketing in Spark from an optimization point of view. ✅ TL;DR Answer Purpose Best Choice Filtering / Scanning ✅ Partitioning Joining Large Tables ✅ Bucketing 🧠 Key Differences Feature Partitioning Bucketing Definition Splits data into directory-based partitions Splits data into fixed number of hash buckets Best For Optimizing filters and…
What is Hive? Important Points, Interview Questions
Absolutely! Let’s break down the different Hive Table Types, their definitions, and the key differences with practical examples and a comparison table. 🧠 Hive Tables and Their Types Hive provides logical abstraction over data in HDFS or compatible storage systems. There are 4 major types of Hive tables: 1️⃣ Managed Tables (Internal Tables) ✅ What…
How SQL queries execute in a database, using a real query example.
We should combine both perspectives—the logical flow (SQL-level) and the system-level architecture (engine internals)—into a comprehensive, step-by-step guide on how SQL queries execute in a database, using a real query example. 🧠 How a SQL Query Executes (Combined Explanation) ✅ Example Query: This query goes through the following four high-level stages, each containing deeper substeps.…
Comprehensive guide to important Points and tricky conceptual issues in SQL
Let me explain why NOT IN can give incorrect results in SQL/Spark SQL when NULL is involved, and why LEFT ANTI JOIN is preferred in such cases—with an example. 🔥 Problem: NOT IN + NULL = Unexpected behavior In SQL, when you write: This behaves differently if any value in last_week.user_id is NULL. ❌ What…
RDD and Dataframes in PySpark- Code Snipppets
Where to Use Python Traditional Coding in PySpark Scripts Using traditional Python coding in a PySpark script is common and beneficial for handling tasks that are not inherently distributed or do not involve large-scale data processing. Integrating Python with a PySpark script in a modular way ensures that different responsibilities are clearly separated and the…
Azure Databricks tutorial roadmap (Beginner → Advanced), tailored for Data Engineering interviews in India
Here’s your complete advanced tutorial covering: ✅ Concepts Explained 1. Medallion Architecture (Bronze → Silver → Gold) 2. Auto Loader vs Batch Load Auto Loader Batch Load Incremental file detection One-time or scheduled loads Uses cloud file notification Manual or cron-based Scalable & schema-evolving Static schema mostly 3. Databricks Workflows (Jobs) 4. CI/CD in Databricks…
Spark SQL Join Types- Syntax examples, Comparision
Here are Spark SQL join questions that are complex, interview-oriented, and hands-on — each with sample data and expected output to test real-world logic. ✅ Setup: Sample DataFrames 🔹 Employee Table (emp) 🔹 Department Table (dept) 🧠 1. Find all employees, including those without a department. Show department name as Unknown if not available. 🧩…