Gain insights into SQL by exploring database creation, data manipulation, and advanced queries. Learn about practical applications and practice for SQL interviews to build confidence and readiness.

sql.tar.gz

The ability to work SQL is becoming an increasingly in-demand skill, both for software developers and people in less technical roles. If you’re interested in learning SQL and have no prior experience with it, then this course will be your light in a dark tunnel.

You’ll start by covering the basics of SQL such as how to create a database, how to insert, query, and update data. You’ll also learn fundamental concepts that developers and data scientists use everyday such as multi-table operations, nested queries, and how to set up views. 

Throughout, you’ll get to execute SQL queries in your browser and see results in real-time - you won’t need to worry about set-up.

At the end of this course, you’ll also get some hands-on practice with common SQL interview questions, so when the time comes, you’ll be ready and confident to answer any question that comes your way. Let’s get started!

An Introductory Guide to SQL

# DISTINCT CLAUSE
We'll work with the __DISTINCT__ clause in this lesson. This clause can be used to output unique rows in a result set. Remember __DISTINCT__ is a post processing filter, meaning it is applied to the resulting rows of a query.


## Example Syntax
> SELECT DISTINCT **col1** 
>
> FROM **table**;
>



>Connect to the terminal below by clicking in the widget. Once connected, the command line prompt will show up. Enter or copy and paste the command **./DataJek/Lessons/21lesson.sh** and wait for the MySQL prompt to start-up.

This lesson demonstrates how to remove duplicates from a result set using the DISTINCT clause.

Introduction

Basic SQL

Joins

Nested Queries

Multi Table Operations

Views

Stored Procedures

Triggers

Miscellaneous

Practice & Prep

Epilogue

DISTINCT

DISTINCT CLAUSE

Example Syntax