The database diagram allows designers to visualize the relationships between tables. In this video, Adam shows how to create a relationship between two tables in the entity relationship diagram.
- [Instructor] Let's go back to our database diagram … and hook these to tables together … with a formal relationship. … I'm continuing on from the last chapter, … but if you need the text that I have … on the left side of my screen … that builds the Products and Suppliers table, … then you can find that text … in the exercise files for this course. … To create a relationship … between the Products table and Suppliers table, … we first need to identify what columns … we'll join together. … First, let's think about the direction … of the relationship. … Does it make more sense that each, individual … product has multiple suppliers? … Or that each, individual supplier … sends us multiple products? … I think the latter makes sense … in a typical business, … so I'm going to join the primary key … from the Suppliers table to the Products table. … But what field should it connect to over here? … We currently have a supplier field … that's storing a "varchar100" data type. … This is a text data type …
Author
Released
9/23/2019- The basics of data storage
- Choosing an entity-relationship design tool
- Using primary keys to identify records
- What to consider when naming objects
- Creating a unique constraint
- Establishing table indexes
- Relating tables with foreign keys
- One-to-many and one-to-one relationships
- Normalization
- Writing SELECT queries in SQL
Skill Level Intermediate
Duration
Views
Related Courses
-
Database Foundations: Administration
with Adam Wilbert1h 14m Beginner -
Learning Relational Databases
with Adam Wilbert2h 43m Beginner
-
Introduction
-
1. Get to Know Relational Databases
-
What the CRUD?3m 48s
-
2. Entity Relationship Diagrams
-
Choose an ER design tool5m 7s
-
Design a table3m 39s
-
3. Data Integrity and Validation
-
Data constraints1m 44s
-
Create a unique constraint5m 46s
-
Define a default value3m 58s
-
Establish table indexes4m 49s
-
Add check constraints5m 31s
-
-
4. Relationships
-
Diagram a relationship2m 42s
-
One-to-many relationships2m 10s
-
One-to-one relationships1m 10s
-
Many-to-many relationships2m 21s
-
Self joins2m 17s
-
Cascade changes2m 17s
-
5. Normalization
-
When not to normalize2m 29s
-
6. Structured Query Language
-
Data definition queries6m 22s
-
Data manipulation queries4m 52s
-
Create a database view2m 44s
-
7. Beyond the Relational Model
-
Graph databases1m 38s
-
Document databases1m 32s
-
-
Conclusion
-
Next steps59s
-
- Mark as unwatched
- Mark all as unwatched
Are you sure you want to mark all the videos in this course as unwatched?
This will not affect your course history, your reports, or your certificates of completion for this course.
CancelTake notes with your new membership!
Type in the entry box, then click Enter to save your note.
1:30Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.
Share this video
Embed this video
Video: Diagram a relationship