L7 : DQL Theory (Part 1) — SELECT, Projection & Selection | Complete SQL Course

Description:
In this video, we begin DQL (Data Query Language) and focus on the most important SQL command — SELECT. This lesson explains how data is retrieved from tables using clear theory before moving to practical queries.

You’ll also understand two core database concepts used in DQL: projection and selection, which form the foundation of every SQL query you will write.

⏱️ Video Timestamps

00:00 – Intro
00:20 – What Is DQL?
01:15 – Overview of SQL Query Language
02:10 – Introduction to SELECT Statement
03:30 – What Is Projection in SQL?
04:45 – What Is Selection in SQL?
06:10 – Projection vs Selection
07:20 – How These Concepts Work in Queries
08:10 – Summary & Outro

In this video, you will learn:

What DQL is and where it is used
Purpose of the SELECT statement
What projection means in SQL
What selection means in SQL
Difference between projection and selection
How these concepts apply to real SQL queries

This lesson builds the base for writing effective SELECT queries in the upcoming videos.

Stay tuned for DQL Part 2, where we start writing practical SELECT queries.


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