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Relational Databases With SQLAlchemy

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What Does Relational Mean?

1:45 with Megan Amendola

Learn what a relational database is.

Prerequisites

Terms

  • Relational Database - A database structured to recognize relationships between items

SQLAlchemy Docs

Tutorial Docs

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    [MUSIC] 0:00
    Hi, my name is Megan, and I'm a teacher here at Treehouse. 0:09
    In this workshop we're going to dive into relational databases using SQLAlchemy. 0:13
    Make sure you're familiar with SQLAlchemy before moving on. 0:18
    Check the prerequisites and teacher's notes below. 0:22
    Before we jump into the code, let's chat about what relational means. 0:26
    Let's think about a real-life scenario. 0:32
    Let's say you work for a small business, you probably have a list, or 0:34
    spreadsheet, or database of your customers. 0:39
    Now, if a customer makes a purchase, 0:42
    you might think about adding on to the table like this. 0:44
    But over time, this would probably get confusing and hard to follow. 0:49
    Instead, you can break this up into two tables, and 0:56
    then create a relationship between the two. 1:00
    In the second table, you can see there is a column for the customers ID. 1:04
    IDs are always unique, since this is the primary key of the customer table. 1:09
    This is called a foreign key. 1:15
    It lets your database know there's a relationship between these two tables. 1:17
    These foreign keys are shared attributes between the tables. 1:22
    Now that we have a quick overview of a relational database, 1:27
    I find playing around in the code helps solidify the knowledge. 1:31
    So in the following videos, let's create our own relational database. 1:35
    Don't forget to check the teacher's notes as you go. 1:40
    Let's get started. 1:43

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