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

Data from table B is deleted but not from table A

Consider we have two tables A and B each with one only one column.



Table A

| ID  |
| - | 
|  1 | 
|  5 |

Table B

|  Name |
| - |
| Alex  |
| John  |

What will be the output of running the below query:

```mysql
DELETE A, B FROM A, B WHERE A.id in (-7);
```

<p>Consider we have two tables A and B each with one only one column.</p>
<p>Table A</p>
<table>
<thead>
<tr>
<th>ID</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
</tr>
<tr>
<td>5</td>
</tr>
</tbody>
</table>
<p>Table B</p>
<table>
<thead>
<tr>
<th>Name</th>
</tr>
</thead>
<tbody>
<tr>
<td>Alex</td>
</tr>
<tr>
<td>John</td>
</tr>
</tbody>
</table>
<p>What will be the output of running the below query:</p>
<pre><code class="language-mysql">DELETE A, B FROM A, B WHERE A.id in (-7);
</code></pre>


Question # 1

<p>Question # 1</p>


Quiz yourself on MySQL commands, including DELETE, JOIN, and INDEX.

Introduction

Basic SQL

Joins

Nested Queries

Multi Table Operations

Views

Stored Procedures

Triggers

Miscellaneous

Practice & Prep

Epilogue

Quiz 2