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

# Multi-Table Delete
We know how to delete data from a single table, however, if you are confronted with a situation where you want to delete data from one table and also any related data from other tables, you can employ the multi-table delete queries. An example scenario can be that when we delete an actor from our __Actors__ table we also want all rows in the __DigitalAssets__ table belonging to the deleted actor removed too.

## Older Syntax
>
>
>DELETE **T1**, **T2**   
>
>FROM **T1**, **T2**, **T3** 
>
>WHERE **\<condition>**



## Newer Syntax
Use the newer syntax as it reads better:

>DELETE FROM **T1**, **T2** 
>
>USING **T1**, **T2**, **T3** 
>
>WHERE **\<condition>**
>



>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/36lesson.sh** and wait for the MySQL prompt to start-up.

This lesson demonstrates how to delete data from multiple tables.

Introduction

Basic SQL

Joins

Nested Queries

Multi Table Operations

Views

Stored Procedures

Triggers

Miscellaneous

Practice & Prep

Epilogue

Multi-Table Delete

Multi-Table Delete

Older Syntax

Newer Syntax