Learn Firefox, Postgres and React-storybook

You've got some practice with using SQL to select, update, and join database tables.

But perhaps you've found yourself with a sneaking suspicion that you could be more efficient with your PostgreSQL.

Does your query seem slow?

A lesson on how to profile queries will point you in the direction of a fix.

Are you performing multi-step operations one at a time that are susceptible to errors?

The "all or nothing" transaction is the cure.

These are just a couple of examples of the techniques, tips, and tricks that Tyler Clark has learned in his years of experience working on large scale production applications.

Other topics in this course include working with CSV files, different techniques for aggregating & filtering, and more!

Watch Tyler's course, and continue your journey toward SQL mastery.

Check out the [**Community Notes for this course.**](https://github.com/eggheadio-projects/advanced-sql-for-professional-developers)

PostgreSQL is a powerful, open source object-relational database system.

postgres

Advanced SQL for Professional Developers

Most applications rely on databases to store data. Understanding how to create a database and communicate with it unlocks a critical power in your web development career. 

In this course, Tyler presents all the building blocks of creating and interacting with a PostgreSQL database. From creating a brand new table, up through organizing and aggregating data across multiple tables, you will learn the fundamental skills of SQL — and you’ll be prepared to apply them right away.

After completing this course, you’ll be ready to tackle more challenging SQL topics like proper data modeling, normalizing data, and exploring different database types.


Check out the [**Community Notes for this course.**](https://github.com/eggheadio-projects/sql-fundamentals)

SQL Fundamentals

You know the basics of Postgres, but most meaningful queries will require you to combine tables in novel ways to ask questions you couldn't ask with a single table alone. Joins and unions come up over and over again in interview questions -- because of how fundamental they are. This course will make you a master of your tables, and give you the power to answer questions you couldn't before. 

Understand Joins and Unions in Postgres

In this course we will show you how to wield the power behind the elusive window function. Which five movies were the highest grossing each year? Who are the highest performers in each department relative to their peers? These questions ask us to partition records into subgroups and answer questions about those groups -- that’s the power of a window function. 

Many programmers will reach for their favorite scripting language to solve problems like these, but window functions allow you to answer them with the speed and efficiency of the Postgres query planner.

Plus, with the power to further slice and dice this derivative information, there’s no limit to the questions you can answer with raw SQL.

If you’re interested in the Postgres client that is used in this course you can [download it here](https://macpostgresclient.com/?source=brett) to check it out and follow along.

Using Postgres Window Functions

It’s amazing how much you can accomplish with a basic knowledge of SQL. In this course we’ll learn how to store lots of information (many millions of things!) and answer nearly any question we might have about that information (on the order of milliseconds!) 

We’ll learn enough to make you say you “know SQL” -- table creation, inserts, selects, updates, deletes, aggregations, indexes, joins, and constraints. Along the way we’ll model real world problems so that you can see just how powerful SQL will make you!

If you’re interested in the Postgres client that is used in this course you can [download it here](https://macpostgresclient.com/?source=brett) to check it out and follow along.

Get Started With PostgreSQL

React is one of the web’s most popular frameworks for building JavaScript applications. 

If you know what you’re doing, React can drastically simplify how you build, use, and maintain code.

Whether you’re a React newbie or you’re ready for advanced techniques, you can level-up with egghead. Explore our in-depth courses, lessons, and community resources to build more powerful applications and crack open your career.

react

Storybook is a UI component development environment for React, Vue, and Angular. With that, you can develop UI components without running your app.

Here I show how best to configure a React Storybook to use [Typescript](/q/typescript) (with TSX). This lets you write your reusable components with maximal type safety. Please see the provided code for the full source.

Configure React Storybook for use with Typescript

Creating tables is actually quite simple. However before we go creating tables we need to first understand the data we want to store. To make sure our data scales appropriately we need to break down the data into its smallest form so we can easily add data and read from it. 

### Other DB Types
https://dev.mysql.com/doc/refman/8.0/en/data-types.html
https://docs.oracle.com/cd/B28359_01/server.111/b28318/datatype.htm
https://docs.microsoft.com/en-us/sql/t-sql/data-types/data-types-transact-sql?view=sql-server-2017
https://www.postgresql.org/docs/9.5/datatype.html

Create a Table with SQL Create

Tables in databases are not worth much value if they do not actually hold data. In this lesson we will use the insert statement to add rows of data to our table. We'll break down each component of the statement and review what is required for a successful insert. 


Add Data to a Table with SQL Insert

Databases are not really good for anything if we are not able to get the data out. By using the select statement, we can pull out all of the data within our database table. Let's work with different queries that pulls out all of our columns, just some of the columns, and even filters out duplicate column values. 

Query Data with the Select Command in SQL

One of the core commands in SQL is update. This is how we can modify the data that is already in our database table. Let’s update our users table and change one of our user's duplicated user handle to a new UUID. We'll even use a postgres extension to generate new UUIDs.  




**UUIDs / GUIDs**

*Postgres* - http://www.postgresqltutorial.com/postgresql-uuid/

*SQL Server*- https://docs.microsoft.com/en-us/sql/t-sql/functions/newid-transact-sql?view=sql-server-2017

*MySQL* - https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html#function_uuid

*Oracle* - https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html




Update Data in a Table with SQL Update

Deleting data within our table is easily done by using ether the delete, truncate, or just dropping the table altogether from our database. Let’s remove a user from our table using the delete command, remove everyone with truncate, then drop the entire table with the drop command. 

Removing Data with SQL Delete, Truncate, and Drop

SQL gives us the power to choose what data we pull out of our table. We will use the where clause within our select statement with many operators. These include the greater than, less than, equal, and not equal. We will also use some special operators such as "in", "between", and "is". 

Conditionally Select out Filtered Data with SQL Where

Another powerful SQL skill is understanding how to group rows together by column values.  Once the data is grouped together, it can be difficult to understand how to actually work with the groupings. In this lesson, we will use the group by clause, as well as the count, sum, avg, min, and max aggregate functions. 

### Counts with create date and first name example: 
```sql
SELECT u.total, u.create_date, first_name 
FROM Users us 
INNER JOIN (SELECT count(create_date) AS total, create_date 
   FROM Users
   GROUP BY create_date) u ON u.create_date = us.create_date;
```

### Min create date with first name example: 
```sql
SELECT create_date, first_name 
FROM Users 
WHERE create_date = (select min(create_date) FROM Users);
```
### Aggregate functions: 

https://www.postgresql.org/docs/9.5/functions-aggregate.html
https://dev.mysql.com/doc/refman/8.0/en/group-by-functions.html
https://docs.microsoft.com/en-us/sql/t-sql/functions/aggregate-functions-transact-sql
https://docs.oracle.com/database/121/SQLRF/functions003.htm

Select Grouped and Aggregated Data with SQL

When working with database tables, we want to make sure we keep our data as simple as possible. This can sometimes mean having multiple tables that share some data columns. Using the join statement, we can combine data between two tables on similar column data to gather more information in one query. Let’s work through some common join statements like left, right, inner, and cross join. 


Combining Tables Together with SQL Join Statements

This course is designed to take someone that has no experience with relational databases and teach them how to at least create, read, update, and delete. We'll explore many different aspects of SQL and what makes working in relational databases easy. This video also goes over how to install postgres on your machine so you can follow along. 


### Install Homebrew for Mac
https://brew.sh/

### Windows postgres installer
https://www.postgresql.org/download/windows/

Setup and Introduction to SQL Fundamentals

Relational databases can organize their data in a way that makes it more efficient to add/update/read/delete from. Similar to books, using SQL we can create indexes which defines how to our organize data behind the scenes. 

### More Info 
https://www.postgresql.org/docs/9.1/indexes.html

https://dev.mysql.com/doc/refman/8.0/en/mysql-indexes.html

https://docs.oracle.com/cd/E11882_01/server.112/e40540/indexiot.htm#CNCPT721

https://docs.microsoft.com/en-us/sql/relational-databases/indexes/clustered-and-nonclustered-indexes-described?view=sql-server-2017

Organize Table Data with Indexes

SQL is dynamic enough to handle queries within queries. These inner queries are called subqueries and they can be used in many different sections of another query. In this video we will use subqueries within a where clause, a join statement, and as a column value. 

### Answer to video challenge
```
select user_handle, sku, (select avg(quantity) from Purchases where user_handle = p.user_handle and sku = p.sku) from Purchases p group by user_handle, sku;
```

Subquery Dynamic Datasets in SQL

If the data in your tables do not have integrity, meaning there are missing rows, incorrect values, or duplicate rows, your table is not worth much. Data is king and there are simple ways we can make sure we keep this integrity. Constraints are ways to make sure our data stays in a healthy state. Not nulls, uniques, primary keys, and foreign keys, are all constraints we will review in this lesson to give you the tools to keep your data in check. 

Keep Data Integrity with Constraints 

The Chrome Developer Tools (DevTools for short), are a set of web authoring and debugging tools built into Google Chrome.

chrome-devtools

The axe browser extension (for Chrome and Firefox) is an immensely helpful tool for auditing web pages for accessibility defects.  This extension is powered by the same rules engine developed by Deque Labs in their axe-core open source library which also powers the react-axe development tool.  Each reported defect offers a ton of information about the defect, why it's a problem, severity level, groups impacted and ways to fix the defect.  This can be a great resource for learning more about how to write accessible code.

## Resources
* [Chrome browser extension](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd)
* [Firefox browser extension](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/)

Use the axe Browser Extension to Audit a Web Page for Accessibility Issues

WAI-ARIA, the Accessible Rich Internet Applications Suite, defines a way to make Web content and Web applications more accessible to people with disabilities. It especially helps with dynamic content and advanced user interface controls developed with Ajax, HTML, JavaScript, and related technologies. 

aria

tota11y is a great tool to add to your accessibility auditing toolkit.  tota11y is a browser extension available for Chrome and Firefox that helps visualize accessibility violations (and successes), while educating on best practices.  It can make for a really helpful supplement to other accessibility auditing tools.

## Resources
* [About tota11y](https://khan.github.io/tota11y/)
* [Chrome browser extension](https://chrome.google.com/webstore/detail/tota11y-plugin-from-khan/oedofneiplgibimfkccchnimiadcmhpe?hl=en)
* [Firefox browser extension](https://addons.mozilla.org/en-US/firefox/addon/tota11y-accessibility-toolkit/)

Use tota11y to Visualize Accessibility Issues

Using our accessibility auditing toolkit we can find issues concerning landmark regions in our web application.  The react-axe library will report findings in the JavaScript console of the browser.  We could also run the axe browser extension to see the same results.  The tota11y browser extension will annotate any landmark regions on the page and therefore if none are annotated it may indicate that they aren't any (_NOTE: tota11y will only annotate landmark regions using aria roles and not those using HTML5 elements_).  Finally using the VoiceOver Rotor in Safari will show us whatever landmark regions have been defined in the Landmarks menu. 

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