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

# Multiple Triggers
It is possible to create triggers on a table whose action time and event are the same. Such triggers are fired in a sequence that is specified at the time of creation of the triggers. The __FOLLOWS__ and __PRECEDES__ keywords are used to define the sequence in which triggers associated with a table having the same action time and event execute.

## Syntax

>CREATE TRIGGER **trigger_name** 
[BEFORE | AFTER] [INSERT | UPDATE | DELETE]
>
>ON **table_name**
>
>[FOLLOWS | PRECEDES] **existing_trigger_name**
>
>FOR EACH ROW
>
>**trigger_body**

>Connect to the terminal below by clicking in the widget. Once connected, the command line prompt will show up. Enter or copy-paste the command **./DataJek/Lessons/50lesson.sh** and wait for the mysql prompt to start-up.


In this lesson, we will see how to write multiple triggers for a table which  have the same action time and event.

Introduction

Basic SQL

Joins

Nested Queries

Multi Table Operations

Views

Stored Procedures

Triggers

Miscellaneous

Practice & Prep

Epilogue

Multiple Triggers

Multiple Triggers

Syntax