Deesa Technologies

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Deesa Technologies is built around a simple belief — the best way to learn engineering is from people who actually build systems, not just teach concepts. I’...

Latest Videos

SQL Set Operators Explained (UNION, UNION ALL, INTERSECT, MINUS)

SQL Operators Explained (Arithmetic, Comparison & Logical)

RANK vs DENSE_RANK in SQL Explained (With Real Examples)

Enable & Disable Constraints in Oracle SQL (Step-by-Step Guide)

How to ALTER Constraints in SQL (Add, Modify, Drop Explained)

JOIN vs SUBQUERY in SQL (Which is Better & When to Use)

CROSS JOIN in SQL Explained (Cartesian Product Made Easy)

SELF JOIN in SQL Explained (With Examples)

Bad Database Design Why One Table for Everything is a Mistake (Amazon Example)

FULL OUTER JOIN in SQL Explained (With Examples)

How to Install Oracle Database & SQL Developer (Step-by-Step Guide)

SQL Joins Explained (Beginner Friendly Introduction)

Oracle SQL Users & Privileges Explained (Beginner Guide)

SQL WHERE Clause Explained (Filter Data Like a Pro)

INNER JOIN in SQL Explained (With Examples)

Oracle SQL SELECT Basics + ALTER TABLE Explained (Beginner Friendly)

Create Tables in Oracle SQL (Hands-On Practice for Beginners)

LEFT JOIN in SQL Explained (With Examples)

SQL ORDER BY Explained (Sort Data Ascending & Descending)

ROWNUM vs ROWID in Oracle SQL (Key Differences Explained)

RIGHT JOIN in SQL Explained (With Examples)

SQL DISTINCT Explained (Remove Duplicate Rows Easily)

Foreign Key in SQL Explained (With Real Examples)

What are Constraints in SQL (With Real Examples - Beginner Guide)

UNIQUE Constraint in SQL Explained (With Real Examples)

Primary Key in SQL Explained (With Real Examples)

NOT NULL Constraint in SQL Explained (With Real Examples)

DEFAULT Constraint in SQL Explained (With Real Examples)

Amazon SQL Project Overview

CHECK Constraint in SQL Explained (With Real Examples)