I cannot fault anything about this video. It's simple, and you've presented the information in an elegant, clear manner at a steady but not-too-slow pace, and the information is so incredibly useful. That bridge table idea is exactly what I was needing to solve my DB design. Thank you for sharing your knowledge!

I have been struggling for two weeks trying to understand many-to-many and this example made it all clear now. You're the best!

Thank you for taking the time to create this tutorial. Sharing your apparent years of accrued knowledge has saved myself and others countless hours of frustration. Because of your tutorial, I'm not even thinking about smashing the wife's favorite coffee mug anymore. Thank you again, sir.

@mrbranmar

3 жыл бұрын

@Lh Lh no he's 12 and a half

no one has ever made this any simpler than this video. thanks very detailed, great examples, and thank you

U reminded me one of my funny Lecturer whos teaching me this Unit{Database}...Above all, u r amazing. Thanks, Sir.Greetings from Kenya

This is actually perfect, I had a good understanding of this but this has cleared all my doubts and solidified my knowledge.

Thank you for presenting such explanation that isn't provided on my online studies.

thank heavens i came across you......i am designing a datbase for django ...and i was completely wrong in my approach and duplicating and throwing htings around all over the place...now im gonna start again and try and get a better design.

Excellent work! Thank you so much for this training!!!

Important to know: Reverse engineering for databases exists only up too Visio 2010. That was an extremely good feature to create nice looking ERD for documentation purposes.

This was a very helpful and informative video. Thank you. I'm looking forward learning more.

Extremely concise. Thank you!

I appreciate the great explanation, thank you! Saved me allot of time :)

Is it correct that OrderProducts and Products should NOT be plural?

Fantastic video. Thank you for creating this!!

Amazing... Love from India !

Why we can't we use both orderID and product ID as composite key in this?why we use line No and orderID as composite key?

excellent, thank you for making this video, very helpful!

Sorry sir .once you are given to design an ERD of an organization or companies .and you want all departments to be represented by it table how do we count relation between the attribute (many to many) or (one to one) or (one to many)? Please sir help me

Just learning SQL and this helps on the many-many relationship

Best tutorials one can have. Thanks a ton!

Awesome way of explaining...Thanks!

Thank you for the upload! Do you know if Dr. Gogolin has a series of videos or a channel anywhere? I was able to grasp the concepts he was talking about a lot better than most instructors.

Thank you for explaining based on practical corporate experience

Oracle Database is a set of tables with foreign key primary key relationship and at the O/S level it is a file with dbf extension? & database server at the O/S level is a set of dbf and files with few other extensions?

I have hard time understanding the second version of the model. How is the address tied to customer ID? What specifically is the address attribute for? Street name, house number, flat number? How is this situation different from having customer name in one field as it is in the first model?

this is brilliant, thank you

Thanks this gave me some clarity!

Fantastic tutorial Sir. Thanks a lot.

No Address2 for unit, apartment or suite information or an address behind a street front building?

A problem occurred while Microsoft Access was communicating with the OLE server or ActiveX Control how to fix

A very nice explanation, thank you for the tutorial.

may did you make a vedio for a ER diagram of computer Store.

why all PK there is no FK?

Thanks for this awesome lecture

Excellent video! Thank you

This is just awsome! Thanks so much.

Super helpful, thanks!

Am a newbie in Ms access i think the data design is quite helpful

This was incredibly helpful! I am designing my first database for my mother's daycare business. I liked the idea of separating the Orders from the Products, but I don't know if I that's how I should create the classes in my database. I have a table with classID and location and capacity. Then I have a Student Table and a Teacher Table. Right now I have tacked on to each the Student and Teacher tables a field called ClassID where you can plug in the ClassID to which they belong at the moment. But then I was thinking after watching this video, if it's better design to have a separate table which has ClassID and PersonID only. That personID can either be a TeacherID or a StudentID so that the table would reflect every person tied to that particular class. I'm double thinking my design.

@GoSparker

8 жыл бұрын

MGELC - one of the most common responses to database design questions is "it depends." In your case if you have the ClassID in the Student and Teacher tables then you can only have one instance of a class for each student and teacher. In other words, you won't see history. For example, I can put the ClassID into the Student table and see what class the student is currently in, but if you move the student to another class then the ClassID changes in the Student table and you don't have a record of the previous student class relationship. If you have a bridge table between Student and Class (let's call it StudentClass) and have the StudentID and ClassID in the StudentClass table as well as a start and end date you will be able to keep track of all of the classes a student has been in. Similar with the Teacher and Class relationship. The other thing that the StudentClass table can do for you is allow a student to be in more than one class at a time.Another part of the "it depends" question is how important is it to know if a student was in another class? If you don't care then you may not have a use for the StudentClass table and perhaps could just use a comment field in one or more of the tables to handle some details. The problem with comment fields is that they can be hard to use in queries - particularly in joins. Hope this helps.

@kbdavis0007

7 жыл бұрын

MGELC a link table is what you are looking for 😀 a table that just provide links to related data

@lasujacob

7 жыл бұрын

you can connect with me on whatsapp +256787867812

@ambars5747

4 жыл бұрын

@@GoSparker That's a great answer and very helpful. Thanks!

10:50 And if 1-N or N-1 and not N-N what you? not bridge table?

thanking you Very helpful video

Very good explanation, thank you!

Thanks for your good work

so nicely explained..thanks!

Shouldn't the CustomerID in CustomerPhone be a FK not a PK? Same as the OrderID and ProductID in the OrderProducts table?

@littleleaves9886

2 жыл бұрын

if we make them FK then we have to introduce their own ID like customerPhoneID, orderProductsID

Thanks for the tutorial!

First letter of each word is capital in ZipCode is Pascal Naming convention, Camel case naming convention is zipCode first letter will be small of the word, after that first letter will be capital

Thanks for video. But I have a question. How can you say that customer table violates 2nf? I don't think it does because employer name is totally dependent on customer key and not the subset of the candidate key. Please let me know. Thanks!

@littleleaves9886

2 жыл бұрын

I agree with you. But if you need to keep full details of Employer, better move that to separate table.

Great explainer, thanks.

thanks for this!

Sir , Thank you for the lecture, it cleared up lot of things that i didnt understand before? do you have any other videoes on relational databse design and implementation?

Thank you so much for this video 🙏🏼

thank for this wonderful tutorial

Very good tutorial

Thanks for this lesson. I wasn't clear on why 2 phone numbers is bad?

really well explained

So, lets say we have a local business where the # of zip codes is limited but you can have thousands of customers. Would it save memory and increase search speed to store the list of zip codes in a separate table and just have a zip_id field for each customer point to a row in the zip code table, instead of storing the whole zip code for each customer?

@GoSparker

5 жыл бұрын

Preface this response with 'it depends', but in general you would be adding complexity. Consider looking at this another way - don't store city and use zip code to look up city. For a local business the volume is likely such that the space savings for having a zip lookup would be inconsequential. With regard to speed - adding joins can actually slow down queries so often the design question is balancing space and speed. In other words, saving space in a way that increases joins may slow down response time. So you often find that a gain in one (space) area is a loss in another (speed). Usually it is best to keep your design as simple and flexible as possible so that as it goes through its life cycle you are in a position to be able to adapt/modify the design for new requirements that emerge. A zip_id would likely be some type of integer field. The zip code may be an integer or character (international zip codes). So you would be adding an additional field with zip_id that probably consumes approximately the same space as zip code. You would also need to maintain a zip code table that may end up being all zip codes. So bottom line is unless there are unusual requirements I wouldn't create a zip_id field that points to zip code.

can we use customer ID , Product Id in a single table?? of order ID

@taimurkhan8420

5 жыл бұрын

no

What about data lakes?

i want to prepare supply chain project can you help me please

great explanation, thanks

@brandonmohammed2234

3 жыл бұрын

HELL IS REAL HEAVEN IS REAL GOD IS REAL JESUS IS THE SON OF GOD ALL THOSE WHO ARE NOT SAVED WILL GO TO HELL AND HELL IS TORTURE FOR ETERNITY BURNING IN NEVER ENDING FIRE, ONCE YOU ARE IN HELL THERE IS NO WAY OUT, HOWEVER RIGHT NOW IT IS POSSIBLE TO PREVENT YOURSELF FROM GOING TO HELL AND BECOMING SAVED AND THERE IS ONLY ONE WAY OUT AND THIS WAY IS JESUS, JESUS DIED AND ROSE AGAIN AS A SACRIFICE FOR OUR SINS SO THAT WE DON'T HAVE TO GO TO HELL AND WE CAN HAVE EVERLASTING LIFE SO WE CAN SPEND ETERNITY WITH HIM IN HEAVEN WHICH IS PURE PARADISE. ALL YOU HAVE TO DO IS TO PUT YOUR FAITH IN JESUS AND TRUST THAT HE WILL SAVE YOU AND THE HOLY SPIRIT WILL MAKE HIS HOME IN YOUR HEART AND LEAD YOU ON THE RIGHT PATH. DON'T DELAY IN TRUSTING JESUS BECAUSE WE CANNOT TELL WHEN IT IS TOO LATE. JESUS IS COMING SOON PLEASE BE READY AND MAKE THE RIGHT CHOICE

Thank you !

@namalvlogs3790

7 жыл бұрын

biruk sisay

please any body give me a learning managment system ERD in database

Thanks mate 👑

Thank you Super Helpful!

thank you sir.

Lovely. :)

Great work, if you have anymore examples please do share them. In your 3NF what exactly happened to the multiple values for phone numbers, if a customer had a work and home number what happened there?

@GoSparker

7 жыл бұрын

Go to about 8:10 and the CustomerPhone table as a design option. There is a Type column that you can use to distinguish between work, home, cell, etc. The design could be expanded to have a Type table with TypeID and Type and then you would put TypeID in the CustomerPhone table rather than Type. This expanded design would help control and standardize the Type(s) that are used in the applications.

@HaploBartow

7 жыл бұрын

Thanks for this comment; I feel like your description in the video did not explain the improvement very well, but this comment helps cover that gap.

Very helpful. thank you for making this video.

Great example...

Hallo, i watched ur vedio , it is great thank u from ur teachng, want a database which is already created in postgresql , then i can fallow step by step. thank u

@taimurkhan8420

5 жыл бұрын

haji sahb turr jao

i like this thanks allot

really cool

Great video! I would like to correct you on one thing @ 15:50... you are using PascalCase and not camelCase... notice the difference?

@GoSparker

5 жыл бұрын

Pascal Case is a subset of Camel Case, which is the more widely known term (although Pascal Case could very well be more utilized in database naming). To be more complete with the various ways fields are often named: camelCase, PascalCase, snake_case, kebab-case ... but even within these there are variations and different types of requirements depending on many things including programming language and configuration of installation. One other point - many DBMS installs are not case sensitive by default. Could almost make a video just on naming conventions... thanks for bringing this up Mike.

@shreyasjejurkar1233

4 жыл бұрын

Yes it's PascalCase.

Why is Excel not a database? Even a piece of paper can be a database right?

@krissicura842

6 жыл бұрын

No, a piece of paper is not a database. The easiest way for me to explain is to say that the data in an excel spreadsheet can be used BY a database to manipulate or manage that data, but it is not in and of itself a database. Think of a spreadsheet as being flat, again, like a sheet of paper but a database as being multi-dimensional. When you want a simple "list" a spreadsheet will do just fine, but as your needs grow and the data points begin to relate in different ways, you may need a database to organize and report on that data.

Thank you .. Sir. Just on lighter note: :-) Sai Reddy .. 8342 Cricket as address :-) :- ) I come from same city Hyderabad and I confirm this is example not real data .. zip code there 6 digits?

Very clear. Thank you.

nice video keep it up

best example for bigginers

thanks brother

good content, thank you

Thank You

good video, thanks

very good

next part plz

I learned this too late after my database grew too much 😭 the struggle is real

Wow thanks

perfect

nice video

@brandonmohammed2234

3 жыл бұрын

HELL IS REAL HEAVEN IS REAL GOD IS REAL JESUS IS THE SON OF GOD ALL THOSE WHO ARE NOT SAVED WILL GO TO HELL AND HELL IS TORTURE FOR ETERNITY BURNING IN NEVER ENDING FIRE, ONCE YOU ARE IN HELL THERE IS NO WAY OUT, HOWEVER RIGHT NOW IT IS POSSIBLE TO PREVENT YOURSELF FROM GOING TO HELL AND BECOMING SAVED AND THERE IS ONLY ONE WAY OUT AND THIS WAY IS JESUS, JESUS DIED AND ROSE AGAIN AS A SACRIFICE FOR OUR SINS SO THAT WE DON'T HAVE TO GO TO HELL AND WE CAN HAVE EVERLASTING LIFE SO WE CAN SPEND ETERNITY WITH HIM IN HEAVEN WHICH IS PURE PARADISE. ALL YOU HAVE TO DO IS TO PUT YOUR FAITH IN JESUS AND TRUST THAT HE WILL SAVE YOU AND THE HOLY SPIRIT WILL MAKE HIS HOME IN YOUR HEART AND LEAD YOU ON THE RIGHT PATH. DON'T DELAY IN TRUSTING JESUS BECAUSE WE CANNOT TELL WHEN IT IS TOO LATE. JESUS IS COMING SOON PLEASE BE READY AND MAKE THE RIGHT CHOICE

Not all heroes wear capes

What is the software name...

@ChristopherJohnsonIsAwesome

4 жыл бұрын

Microsoft Visio was the diagram tool and SQL Server Management Studio was the database tooling

@GoSparker

4 жыл бұрын

@@ChristopherJohnsonIsAwesome Yes Santosh - Christopher is correct.

Excellent... E.. X... C.. ellent..

@GoSparker

4 жыл бұрын

Thank you Santosh!

10:00 Customer DOB should be part of PK, not phone number as the number could change. Primary keys should not be updated

@GoSparker

Жыл бұрын

If I understand your comment at 10 minutes, I'm describing the CustomerPhone table, where phone number is the main piece of data (with area cd). Utilizing DOB rather than phone number as the key would introduce a few potential challenges. One is that the same phone number could be attributed to multiple people. Another is that CustomerID is already unique, so adding DOB would provide no additional benefit as far as key structure in the context of this design. If a person's phone number changed you will create a new record in the CustomerPhone table. If the previous phone number was no longer valid then you would delete the record. You are correct in that primary keys normally don't change - but deleting and adding records is a common operation. If the CustomerPhone key was CustomerID and DOB then you basically have a one to one relationship with the Customer table. This would not allow additional phone numbers (many people have more than one) and then the Customer and CustomerPhone tables would be collapsed into one table as a one to one relationship is not normalized.

epic

I fell asleep like 4 times.... Sheeeesh

👀

Ferris State > hArVard

Data viz, because I'm dumb. customer: id=1(pk); fname=paul id=2(pk); fname=matt Products: id=16,(pk) name=sunglasses id=17(pk), name=Nintendo switch order: id=1(pk); customer_id=1, date=2021 id=2(pk); customer_id=2, date=2020 order_products: [order_id=1, product_id=16](pk); qty=1 "paul order 1 sunglasses" [order_id=1, product_id=, 17](pk); qty=1 - ON Conflict (set qty += 1) -- update qty for duplicate [order_id=1, product_id=, 17](pk); qty=1 + 1 "paul ordered 2 Nintendo switch" [order_id=2, product_id=, 17](pk); qty=1 "matt ordered 1 Nintendo switch"

the sound is not good I am quite disappointed