SQL

Step 1: Master the Basics

Start with the foundation:

SQL syntax & data types

Understand the 3 core SQL categories:

DDL – Data Definition Language

(CREATE, ALTER, DROP)

DML – Data Manipulation Language

(SELECT, INSERT, UPDATE, DELETE)

DCL – Data Control Language

(GRANT, REVOKE)

Step 2: Core Queries & Joins

These are interview favorites:

SELECT, WHERE, ORDER BY, GROUP BY

Joins:

INNER JOIN

LEFT JOIN

RIGHT JOIN

FULL JOIN

If you don’t understand joins clearly, interviews become painful.

Step 3: Advanced SQL

This is where candidates usually struggle — and where you can stand out:

Subqueries & nested queries

CTEs (Common Table Expressions)

Views

Indexing & performance basics

Pro Tip (Very Important)

Don’t just study SQL — practice interview-style questions

Time yourself while solving

Focus on logic + query optimization

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