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Entity Relationship Diagram (ERD) Tutorial – Part 1



Learn how to create an Entity Relationship Diagram in this tutorial. We provide a basic overview of ERDs and then gives step-by-step training on how to make an ER diagram with correct cardinality.

Entity Relationship Diagrams are comprised of 3 main categories: entities, attributes, and relationships. Entities are objects or concepts that are associated with important data—like a customer, order, or product. Attributes represent properties or traits of an entity, such as a customer’s phone number or home address. Relationships demonstrate the link between entities.

Another main aspect of of ERD’s is cardinality, which further defines the relationship between entities in a numerical way. Certain symbols signify the minimum and maximum relationship between different entities.

Additional ERD information:

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42 Comments
  1. Jason Armour 4 months ago
    Reply

    Youtube teaching yet another university class! thanks this was super helpful!

  2. SOUND REINFORCEMENT 4 months ago
    Reply

    wow, thanks

  3. Håkan Eriksson 4 months ago
    Reply

    Thank you, life saver! <3

  4. Nisal Bandara 4 months ago
    Reply

    Assignment is due tomorrow. God I love the internet

  5. Kontrey Share 4 months ago
    Reply

    Hi sir, what difference between ERD that has Rectangle, Shape, Oval and ERD like ur video?

  6. R0CK3TH 4 months ago
    Reply

    Wished every human enity on planet earth could explain this so well as this video 😛

  7. Toasty Toast 4 months ago
    Reply

    Great video. Very well done.

  8. Parsa 237 4 months ago
    Reply

    cancer video

  9. Anuj Singh 4 months ago
    Reply

    Yes ✅

  10. أفنان حسام الدين خليل /D 4 months ago
    Reply

    Big like for you from Iraq ur very good teacher🥰🥰

  11. selome 4 months ago
    Reply

    so, always the Cardinality ratio between two entities max, min min ,max?

  12. Harsh Kumar 4 months ago
    Reply

    THIS IS Exactly what advertising should be like, if I pass my exam, you'll have a new paying client 🙂

  13. Lisia Becker 4 months ago
    Reply

    oh my gosh this video saved me, my teacher is great but i didn't understand it with him, thanks from Brazil!

  14. Muhammad Vaaceph Khan 4 months ago
    Reply

    I think there is a conceptual mistake in the video regarding cardinalities.
    One product can only be part of 1 order, not more than one order.
    Correct me if I am wrong.

  15. Kunal Vaman Dwivedi 4 months ago
    Reply

    Your software is not convenient to use in the online version

    After watching ur tutorials I thought of buying the premium version but now I have second thoughts

  16. GraphicsOn 4 months ago
    Reply

    Well explained, thanks mate.

  17. Neil Patrick Alvarez 4 months ago
    Reply

    1:24 I like how his email refers to hogwarts :))

  18. kariah 's world 4 months ago
    Reply

    thank you so much you made it so simple for me

  19. Ahmad Reshad Sakha 4 months ago
    Reply

    Extract possible entities from the given business rules:
    • An import/export company offer different products to their customers in sale transactions.
    • The company purchase products from different suppliers to various stocks.
    • The company needs to handle their cash flow, stock statistics, customers and suppliers balance to run their business.

  20. Priyanka Byahatti 4 months ago
    Reply

    THANKS!

  21. Sachin Pandey 4 months ago
    Reply

    lucidchart is not free (eg importing shown in the video is not free)
    I need to find other free option

  22. Fresh Prince 4 months ago
    Reply

    how can one product be part of many orders?

  23. hobbes 89 4 months ago
    Reply

    There can only be one Highlander, I mean customer…. Great video!

  24. Andre Ranulfo 4 months ago
    Reply

    Wow!

  25. Rok Karlič 4 months ago
    Reply

    OIS?

  26. eric rouach 4 months ago
    Reply

    thanks man!

  27. Yudi Herdiana 4 months ago
    Reply

    Thank You

  28. Ariff Firdaus 4 months ago
    Reply

    Minimum is zero? Means costumer didn't buy anything. For my logical, costumer have to buy at least thats is call buy-sell.

  29. Zhao Bryan 4 months ago
    Reply

    do u have the slides?

  30. František Hajdekr 4 months ago
    Reply

    Great video – thanks.

  31. Mehmet Filiz 4 months ago
    Reply

    it took our professor 4 years to explain this damn I hate wasting time

  32. Sara Amir 4 months ago
    Reply

    You are better than my professor, Thank you!!

  33. Orobosa Igho-Osagie 4 months ago
    Reply

    Explained in 7 mins what a 23 page lecture note couldn't 🤧♥️♥️

  34. Dave 4 months ago
    Reply

    <3 Lucid Chart, the hero's of ER and ERR modeling. Thank you!!!!

  35. Naseem Azadi 4 months ago
    Reply

    I usually dont give thumbs up or subscribe but i did for you. you explained this very well compared to my textbook .Thank you

  36. Daniel Andrade 4 months ago
    Reply

    anyone knows how he added in order table the customer_name ? i know is from the customer table but how the order table will know that is from that customer table

  37. Rupam Dwivedi 4 months ago
    Reply

    Sir how an order can be related to various products at the same time. A single order must belong to a single product so I think there should be one and only one relationship from order to prduct. Sir Please explain 🙏🙏

  38. Victro z- rix 4 months ago
    Reply

    sometimes Youtubers explain better than those teachers in college

  39. laksh khatri 4 months ago
    Reply

    It's so simple Indians like here who watch this video

  40. Amir Hafizi 4 months ago
    Reply

    my teacher probably give me an assignment about basic ERDs model….but i didn't read the question carefully…so instead of doing basic…i answered it out of the box…don't know if he will mark it …he is pretty strict

  41. Amar Wibianto 4 months ago
    Reply

    My teacher said, this is a CDM not an ERD, can someone explain to me about this? Because I really confuse right now.

  42. Nadaa Alshehri 4 months ago
    Reply

    Thanks for the translation into Arabic (:

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