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SQL Basics for Data Analysts SQL (Structured Query Language) is used to retrieve, manipulate, and analyze data stored in databases. 1️⃣ Understanding Databases & Tables Databases store structured data in tables. Tables contain rows (records) and columns (fields). Each column has a specific data type (INTEGER, VARCHAR, DATE, etc.). 2️⃣ Basic SQL Commands Let's start with some fundamental queries: 🔹 SELECT – Retrieve Data

SELECT * FROM employees; -- Fetch all columns from 'employees' table SELECT name, salary FROM employees; -- Fetch specific columns 

🔹 WHERE – Filter Data

SELECT * FROM employees WHERE department = 'Sales'; -- Filter by department SELECT * FROM employees WHERE salary > 50000; -- Filter by salary 

🔹 ORDER BY – Sort Data

SELECT * FROM employees ORDER BY salary DESC; -- Sort by salary (highest first) SELECT name, hire_date FROM employees ORDER BY hire_date ASC; -- Sort by hire date (oldest first) 

🔹 LIMIT – Restrict Number of Results

SELECT * FROM employees LIMIT 5; -- Fetch only 5 rows SELECT * FROM employees WHERE department = 'HR' LIMIT 10; -- Fetch first 10 HR employees 

🔹 DISTINCT – Remove Duplicates

SELECT DISTINCT department FROM employees; -- Show unique departments 

Mini Task for You: Try to write an SQL query to fetch the top 3 highest-paid employees from an "employees" table. You can find free SQL Resources here 👇👇 https://t.me/mysqldata Like this post if you want me to continue covering all the topics! 👍❤️ Share with credits: https://t.me/sqlspecialist Hope it helps :) #sql

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How do you start AI and ML ? Where do you go to learn these skills? What courses are the best? There’s no best answer🥺. Everyone’s path will be different. Some people learn better with books, others learn better through videos. What’s more important than how you start is why you start. Start with why. Why do you want to learn these skills? Do you want to make money? Do you want to build things? Do you want to make a difference? Again, no right reason. All are valid in their own way. Start with why because having a why is more important than how. Having a why means when it gets hard and it will get hard, you’ve got something to turn to. Something to remind you why you started. Got a why? Good. Time for some hard skills. I can only recommend what I’ve tried every week new course lauch better than others its difficult to recommend any course You can completed courses from (in order): Treehouse / youtube( free) - Introduction to Python Udacity - Deep Learning & AI Nanodegree fast.ai - Part 1and Part 2 They’re all world class. I’m a visual learner. I learn better seeing things being done/explained to me on. So all of these courses reflect that. If you’re an absolute beginner, start with some introductory Python courses and when you’re a bit more confident, move into data science, machine learning and AI. Join for more: https://t.me/machinelearning_deeplearning Like for more ❤️ All the best 👍👍

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Complete SQL road map 👇👇 1.Intro to SQL • Definition • Purpose • Relational DBs • DBMS 2.Basic SQL Syntax • SELECT • FROM • WHERE • ORDER BY • GROUP BY 3. Data Types • Integer • Floating-Point • Character • Date • VARCHAR • TEXT • BLOB • BOOLEAN 4.Sub languages • DML • DDL • DQL • DCL • TCL 5. Data Manipulation • INSERT • UPDATE • DELETE 6. Data Definition • CREATE • ALTER • DROP • Indexes 7.Query Filtering and Sorting • WHERE • AND • OR Conditions • Ascending • Descending 8. Data Aggregation • SUM • AVG • COUNT • MIN • MAX 9.Joins and Relationships • INNER JOIN • LEFT JOIN • RIGHT JOIN • Self-Joins • Cross Joins • FULL OUTER JOIN 10.Subqueries • Subqueries used in • Filtering data • Aggregating data • Joining tables • Correlated Subqueries 11.Views • Creating • Modifying • Dropping Views 12.Transactions • ACID Properties • COMMIT • ROLLBACK • SAVEPOINT • ROLLBACK TO SAVEPOINT 13.Stored Procedures • CREATE PROCEDURE • ALTER PROCEDURE • DROP PROCEDURE • EXECUTE PROCEDURE • User-Defined Functions (UDFs) 14.Triggers • Trigger Events • Trigger Execution and Syntax 15. Security and Permissions • CREATE USER • GRANT • REVOKE • ALTER USER • DROP USER 16.Optimizations • Indexing Strategies • Query Optimization 17.Normalization • 1NF(Normal Form) • 2NF • 3NF • BCNF 18.Backup and Recovery • Database Backups • Point-in-Time Recovery 19.NoSQL Databases • MongoDB • Cassandra etc... • Key differences 20. Data Integrity • Primary Key • Foreign Key 21.Advanced SQL Queries • Window Functions • Common Table Expressions (CTEs) 22.Full-Text Search • Full-Text Indexes • Search Optimization 23. Data Import and Export • Importing Data • Exporting Data (CSV, JSON) • Using SQL Dump Files 24.Database Design • Entity-Relationship Diagrams • Normalization Techniques 25.Advanced Indexing • Composite Indexes • Covering Indexes 26.Database Transactions • Savepoints • Nested Transactions • Two-Phase Commit Protocol 27.Performance Tuning • Query Profiling and Analysis • Query Cache Optimization ------------------ END ------------------- Some good resources to learn SQL 1.Tutorial & Courses • Learn SQL: https://bit.ly/3FxxKPz • Udacity: imp.i115008.net/AoAg7K 2. YouTube Channel's • FreeCodeCamp:rb.gy/pprz73 • Programming with Mosh: rb.gy/g62hpe 3. Books • SQL in a Nutshell: https://t.me/DataAnalystInterview/158 4. SQL Interview Questions https://t.me/sqlanalyst/72?single Join @free4unow_backup for more free resourses ENJOY LEARNING 👍👍

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