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🔰 SQL Roadmap for Beginners 2025
├── 🗃 Introduction to Databases & SQL
├── 📄 SQL vs NoSQL (Just Basics)
├── 🧱 Database Concepts (Tables, Rows, Columns, Keys)
├── 🔍 Basic SQL Queries (SELECT, WHERE)
├── ✏️ Filtering & Sorting Data (ORDER BY, LIMIT)
├── 🔢 SQL Operators (IN, BETWEEN, LIKE, AND, OR)
├── 📊 Aggregate Functions (COUNT, SUM, AVG, MIN, MAX)
├── 👥 GROUP BY & HAVING Clauses
├── 🔗 SQL JOINS (INNER, LEFT, RIGHT, FULL, SELF)
├── 📦 Subqueries & Nested Queries
├── 🏷 Aliases & Case Statements
├── 🧾 Views & Indexes (Basics)
├── 🧠 Common Table Expressions (CTEs)
├── 🔄 Window Functions (ROW_NUMBER, RANK, PARTITION BY)
├── ⚙️ Data Manipulation (INSERT, UPDATE, DELETE)
├── 🧱 Data Definition (CREATE, ALTER, DROP)
├── 🔐 Constraints & Relationships (PK, FK, UNIQUE, CHECK)
├── 🧪 Real-world SQL Scenarios & Challenges

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SQL is one of the core languages used in data science, powering everything from quick data retrieval to complex deep dive analysis. Whether you're a seasoned data scientist or just starting out, mastering SQL can boost your ability to analyze data, create robust pipelines, and deliver actionable insights.

Let’s dive into a comprehensive guide on SQL for Data Science!

I have broken it down into three key sections to help you:

𝟭. 𝗦𝗤𝗟 𝗖𝗼𝗻𝗰𝗲𝗽𝘁𝘀:
Get a handle on the essentials -> SELECT statements, filtering, aggregations, joins, window functions, and more.

𝟮. 𝗦𝗤𝗟 𝗶𝗻 𝗗𝗮𝘆-𝘁𝗼-𝗗𝗮𝘆 𝗗𝗮𝘁𝗮 𝗦𝗰𝗶𝗲𝗻𝗰𝗲:
See how SQL fits into the daily data science workflow. From quick data queries and deep-dive analysis to building pipelines and dashboards, SQL is really useful for data scientists, especially for product data scientists.

𝟯. 𝗗𝗮𝘁𝗮 𝗦𝗰𝗶𝗲𝗻𝗰𝗲 𝗦𝗤𝗟 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄𝘀:
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SQL Tricks to Level Up Your Database Skills 🚀

SQL is a powerful language, but mastering a few clever tricks can make your queries faster, cleaner, and more efficient. Here are some cool SQL hacks to boost your skills:

1️⃣ Use COALESCE Instead of CASE
Instead of writing a long CASE statement to handle NULL values, use COALESCE():

SELECT COALESCE(name, 'Unknown') FROM users;

This returns the first non-null value in the list.

2️⃣ Generate Sequential Numbers Without a Table
Need a sequence of numbers but don’t have a numbers table? Use GENERATE_SERIES (PostgreSQL) or WITH RECURSIVE (MySQL 8+):

SELECT generate_series(1, 10);

3️⃣ Find Duplicates Quickly
Easily identify duplicate values with GROUP BY and HAVING:

SELECT email, COUNT(*) 
FROM users 
GROUP BY email 
HAVING COUNT(*) > 1;

4️⃣ Randomly Select Rows
Want a random sample of data? Use:
- PostgreSQL: ORDER BY RANDOM()
- MySQL: ORDER BY RAND()
- SQL Server: ORDER BY NEWID()

5️⃣ Pivot Data Without PIVOT (For Databases Without It)
Use CASE with SUM() to pivot data manually:

SELECT 
    user_id,
    SUM(CASE WHEN status = 'active' THEN 1 ELSE 0 END) AS active_count,
    SUM(CASE WHEN status = 'inactive' THEN 1 ELSE 0 END) AS inactive_count
FROM users
GROUP BY user_id;

6️⃣ Efficiently Get the Last Inserted ID
Instead of running a separate SELECT, use:
- MySQL: SELECT LAST_INSERT_ID();
- PostgreSQL: RETURNING id;
- SQL Server: SELECT SCOPE_IDENTITY();

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SQL Tricks to Level Up Your Database Skills 🚀

1️⃣ Use COALESCE Instead of CASE
2️⃣ Generate Sequential Numbers Without a Table
3️⃣ Find Duplicates Quickly
4️⃣ Randomly Select Rows
5️⃣ Pivot Data Without PIVOT (For Databases Without It)
6️⃣ Efficiently Get the Last Inserted ID

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https://t.me/sqlresourcestp/161

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