🔥 SQL INSERT, UPDATE, DELETE Explained | CREATE, ALTER & Transactions

Published: 01 January 1970
on channel: CODE WITH NM

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SQL INSERT, UPDATE, DELETE, CREATE, ALTER, SQL Transactions, SQL Data Manipulation, SQL for Data Analysts, MySQL Tutorial, and SQL Commands explained with practical examples. Learn how to create, modify, insert, update, and delete data in SQL safely.

🔥 SQL for Data Analysts #6 | Data Manipulation & Transactions

So far, we've learned how to read and analyze data using SQL.

Now we're going to learn how to change the data itself. 🚀

In today's LIVE session, we'll enter the Data Manipulation & Database Management phase and learn the SQL commands used to create database structures, modify tables, insert records, update existing data, delete records, and work with transactions.

This is an important step for anyone learning SQL, MySQL, Data Analytics, Data Engineering, or Backend Development.

📚 Today's Topics

✅ CREATE DATABASE
✅ CREATE TABLE
✅ ALTER TABLE
✅ Adding & Modifying Columns
✅ INSERT INTO
✅ UPDATE
✅ DELETE
✅ SQL CRUD Concepts
✅ COMMIT
✅ ROLLBACK
✅ SQL Transactions
✅ Transaction Control
✅ Safe Data Modification
✅ Real-World SQL Examples
✅ Data Analyst Practice Questions
✅ SQL Interview Questions
✅ Live Coding
✅ Real-Time Doubt Solving

💡 WHY THIS SESSION MATTERS

As a Data Analyst, you will often work with databases where data changes over time.

A business may need to:

📌 Add new employees
📌 Update employee salaries
📌 Correct incorrect records
📌 Remove invalid data
📌 Add new columns to a table
📌 Safely apply multiple changes

📌 Chapters

00:00 – Live Start
03:18 – Introduction
05:57 – Session 5 Recap
08:18 – Today’s Roadmap
09:59 – Golden Rule
35:39 – ALTER TABLE & INSERT
46:33 – INSERT INTO ... SELECT
54:40 – UPDATE
01:13:24 – DELETE
01:23:49 – Transactions
01:35:32 – Real-World Business Use Case
02:05:10 – Practice Questions — Easy, Medium & Hard
02:11:55 – SQL Interview Questions & Answers
02:17:55 – Today’s Recap
02:19:06 – Homework
02:20:39 – Next LIVE Topic
02:21:23 – Live Q&A
03:10:43 – Outro 🚀

You'll learn how SQL handles these operations and why transactions, COMMIT, and ROLLBACK are important when modifying data.

🔥 REAL-WORLD EXAMPLE

Imagine an HR team discovers that several employee salaries were entered incorrectly.

You need to update multiple records.

But what happens if one update succeeds and another fails?

That's where SQL Transactions become extremely important.

We'll understand:

➡️ What is COMMIT?
➡️ What is ROLLBACK?
➡️ Why should you use transactions?
➡️ How can you safely modify database records?
➡️ What's the difference between DELETE and DROP?
➡️ What's the difference between ALTER and UPDATE?

🎯 PRACTICE CORNER

We'll solve practical SQL problems based on:

✅ Real-world database scenarios
✅ Data Analyst use cases
✅ SQL interview questions
✅ INSERT / UPDATE / DELETE challenges
✅ Transaction-based problems

📅 Date: 21 August 2026 (Friday)
⏰ Time: 8:00 PM IST

📚 Playlist

SQL for Data Analysts | Live Learning with codewithnm

🚀 SQL Course Roadmap

🔵 Phase 1 — SQL Foundations

✅ DBMS & RDBMS
✅ SELECT
✅ WHERE
✅ ORDER BY
✅ LIMIT

🔵 Phase 2 — Filtering & Aggregation

✅ COUNT()
✅ SUM()
✅ AVG()
✅ MIN()
✅ MAX()
✅ GROUP BY
✅ HAVING

🔵 Phase 3 — JOINs & Relationships

✅ INNER JOIN
✅ LEFT JOIN
✅ RIGHT JOIN
✅ UNION

🔵 Phase 4 — Subqueries & CTEs

✅ Subqueries
✅ CTEs

🔵 Phase 5 — Window Functions

✅ ROW_NUMBER()
✅ RANK()
✅ LEAD()
✅ LAG()

🔵 Phase 6 — Data Manipulation

🔥 CREATE
🔥 ALTER
🔥 INSERT
🔥 UPDATE
🔥 DELETE
🔥 Transactions

🔜 Phase 7 — Advanced SQL
🔜 Phase 8 — Real Datasets, Interview Questions & Portfolio Project

━━━━━━━━━━━━━━━━━━━━

👨‍💻 About codewithnm

Welcome to codewithnm — a live-learning platform founded by Nilesh Maurya, helping students and professionals become industry-ready through structured roadmaps, real-world projects, and community-driven learning.

🌟 Join the codewithnm Family

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Inside Discord:

✅ Session Notes
✅ Doubt Corner
✅ Code Sharing
✅ Learning Resources
✅ Weekly Challenges
✅ Community Support

👨‍💻 Founder

Nilesh Maurya

🌐 Website

https://codewithnm.com

📸 Instagram

  / codewithnm

💻 GitHub

https://github.com/codewithnm

🚀 Learning Journey

Python Developer → Data Analyst → Data Science → Machine Learning → Artificial Intelligence → LLM Applications

💬 Have questions? Drop them in the live chat or comments.

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