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

# Nested Queries
In this lesson we'll examine nested queries, a query within another query. With the ability to _nest_ a query, we can combine queries to get the desired result in a single uber query rather than executing each constituent query individually. Nested queries are generally slower but more readable and expressive than equivalent join queries. Also, in some situations nested queries are the only way to retrieve desired information from a database.


>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/30lesson.sh** and wait for the MySQL prompt to start-up.

This lesson discusses nested queries that result in a single value.

Introduction

Basic SQL

Joins

Nested Queries

Multi Table Operations

Views

Stored Procedures

Triggers

Miscellaneous

Practice & Prep

Epilogue

Nested Scalar Queries

Nested Queries