Conceptual, Logical & Physical Data Models

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[@castillog8026]

The best explanation to someone that is just starting off in DBMS. Great job on explaining this in detail!

[@DataAcademyIN]

Thanks George! Your comments are very encouraging :)

[@anon12416]

I agree, thank you so much!!!

[@kc-riyasangle4230]

q​@@anon12416

[@ravitejapremium259]

this is the best DATA MODELLING TUTORIAL i have ever watched. What an explanation good job sir.

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Thank you Raviteja for your encouraging comments ! Please do subscribe.

[@jordanmcquade230]

The best explanation of the 3 stages of a data model that I have seen anywhere. Definitely worth a watch. I've just revisited as a refresher now that I'm working in master data management. Thank you for the great video.

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Thank you for your encouraging comments Jordan. I am glad you found it useful. Do subscribe to the channel.

[@zishanafzal6671]

best video available on youtube for understanding Data modeling.

[@logreene4382]

One hundred percent more thorough and engaging than a textbook. Thank you my friend!

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Thank you Lo Green. Please do subscribe !

[@teetotee]

So here's what I understand, I wanna know if it's correct please: Conceptual data models are like the general overview of how the actual data model should look like, like a sketch for a painting or an architecture. Logical data models are idk, more complex? They basically have key and non-key attributes to the entities now and primary and foreign keys can be used. It's still easy to understand, but is harder to update because it's more complex. Physical's simply like, full-fledged. Entities are called tables, attributes columns, it's even harder to understand and really difficult to change.

[@DataAcademyIN]

Yes, that is a pretty good summary. I am compelled to add just one additional detail to your explanation. The physical data model, apart from being full fledged, is specific to a database, like Oracle or Postgres or SQL Server etc.

[@dakshpatel6565]

Just started my way off with DBMS, being a Mechanical Engineer after going through this, I feel I am in this field since years! Great lesson😌

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Thank you for your comments Daksh! Happy Learning :)

[@alipbarua3396]

The best tutorial for data modelling. I have interview ahead and this video is really helpful.

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Thank you for your comments Alip. All the best for your interview! Please do subscribe.

[@amitray6614]

Great video, just the right depth of coverage, optimum length to keep the viewer engaged. Thanks for taking the effort to prepare and share this. 👍

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[@chinyerenwigwe5166]

Wow even after few years this is still saving lives!!!

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😊

[@nikovandh]

Wow, great video. I tried to read about data models and was 100% lost. Now I 100% understand after watching this video.

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Happy to hear that Nicholas :) . Please do subscribe to get notified of new videos. Cheers !

[@hamsal_khaldi7851]

This 13 min video explains one hour lecture. Thank you

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:) Thank you for your sincere comments !

[@TimandTilly]

Thank you for explaining this! It makes soooo much sense from your POV. My University did not make our weekly lecture notes this simple to understand. Again, thanks dude

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[@pratyushraizada1472]

As an analytics engineer, having realised the downstream cost of a bad data model design, I can totally understand the need for having a structured approach. Thanks for the video.

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That is very well said Pratyush. I am glad you realize the importance of a Data Model well executed. Please do subscribe !

[@pratyushraizada1472]

@@DataAcademyIN Done already, keep spreading the knowledge :D

[@vinnu236]

Great and simple explanation sir. It saves lot of time from reading theory sometimes

[@jayakumari9109]

Hats off to you...you made it so easy to understand...i used to have very confusion between conceptual and logical data model...but your explanation cleared all my confusion... Thanks a lot..

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[@juliocamacho7052]

Thank you for such a clear and accurate explanation of the different database modeling stages

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[@lalbihariprajapati9454]

Just a great video for beginner who want to understand the data model. Thanks for such short but very useful concepts

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Many thanks for your comments Lal Bihari Prajapati. Please do like, share & Subscribe.

[@boringgamerboi3538]

Your teaching is clearer than my lecturer , thanks alot man

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Glad to hear that

[@joankwamboka700]

O Goodness! This is the clearest explanation I have come across. I think this will stick as well.

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[@nikunjmodi5214]

Very helpful. Clearly defined each and every models !!!

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Thank You Nikunj !

[@Kadiar]

Best explanation I’ve ever seen for DBMS

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Hello Kadi. Thank for your comments. Please do subscribe to support the effort. Do browse my channel for more such videos. Cheers !

[@SathishKumar-u8h]

Best video for understanding the types data modelling.

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Thank you Sathish for your comments. I am glad you found it easy to understand. Please do Like, Share & Subscribe!

[@BoxerDogs]

This was explained and presented very well. Extremely helpful. Thank you for creating this video. I took some practice tests for the Microsoft Database Fundamentals Exam (98-364). Now I feel like I really understand the parts that I needed to work on.

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[@larisamuntyan556]

excellent video! thank you very much!

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[@muhwezifrancis414]

thanks because it brings clear description from start to end.

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[@ankushpatil1114]

This was very detailed yet very simple explanation. Thanks a lot Sir.

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[@ChilaKasonde]

Just wanted to thank you my Lecturer did a terrible job explaining these to me , i now have a clear picture of all 3 models thank you

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Words can't describe how encouraged I feel to hear such comments. Thanks for watching. Do subscribe!

[@ChilaKasonde]

@@DataAcademyIN ive subscribed keep up the great work, do you have any material on Relational Algebra?

[@DataAcademyIN]

@@ChilaKasonde I am not an expert on this topic, but it doesn't seem very different from SQL queries on a database. Allow me some time to get back to you with more details.

[@ChilaKasonde]

@@DataAcademyIN thanks will be waiting i think it would be a good video as no one has covered it from what I've seen

[@swaragupta7932]

Best explanation for these 3 models

[@reneeb5585]

Thank you for such a great explanation with visual examples. This helped me greatly.

[@DataAcademyIN]

Thank you Renee, for your encouraging comments. In case you found any issues with the audio of this clip, there is a version with improved audio, here --> kzbin.info/www/bejne/mYqaiI2Pnd52adE Please do subscribe in case you haven't. Thanks !

[@neha6221]

This is actually really good explanation.

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Thanks Gunjan !

[@raghavendrareddy7370]

Thanks a lot going for an interview tomorrow this explanation saves me lot time in understanding 😆👍🏻

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[@OladipoFamily]

This explanation is the best. so easy to comprehend...kudos

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[@saikiranp.r6966]

Hands down the best Video out there.

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Much thanks SaiKiran :)

[@juvettemunji7984]

this is the best explanation ever. You solve my problem

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[@utkucansa]

you explained it in a great and plain way. Thanks.

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You're very welcome!

[@jyothyg6653]

Thank you so much for such a wonderful explanation…. Brief and crisp!

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[@omurnebierarslan8173]

Very clear explanation of the topic...really appreciate it.

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[@osofhia]

Without doubt, the best tutorial, even with my experience that was refreshing!

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[@lavanyagopal.manditheater]

very simply explained and easy to understand. Thanks !!

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[@muhammadfaisalhyder4012]

This is really great for revision purposes 😅 short and to the point. 👍

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Hello Muhammad. Glad you think so! :) Please do Like, Share & Subscribe !

[@jpf1950]

You did a good job here. Your diction and pacing were perfect. The diagrams were simple and complete. Thanks.

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Thank you John for the encouragement. Please do browse my channel for other videos. Do subscribe to get notified of new uploads. Thanks !

[@jacekkangaroo4402]

It looks like I was learning different data modelling methodology 😃 1. logical model, called also Entity Relationship Diagram (ERD) represents entities and main relations between them, has usually primary keys and some main attributes as well, entity is drawn as a rectangle with rounded corners, and entity name is always singular, an entity is one instance of something, 2. physical model, called also as Data Diagram (DD) is generated from ERD also FK columns are added automatically, other columns can be added to the DD manually as well as other UK, indexes and partitions, entities are called tables, attributes are called columns, table is drawn as a rectangle with sharp corners, having a well designed DD we can generate table creation scripts so no manual work is required from developers, table name is always plural, a table is a collection of entities, 3. we should avoid adding a table name to table column names, table product should have columns description, name, short name, size... but not product_name, product_description, product_size...

[@MrAndrewjdavis]

"not product_name, product_description" - depends. If the target of the model is reporting, you would end up with 10 columns all called "name" which is confusing and you would spend ages renaming each column in the report. Much better to give them full names. The other advantage of having the table name is if it is a foreign key, you can use the target table name (with role if needed) e.g. "Product_Id,Product_Code,ProductGroup_Id" or "Customer_Party_Id, SalesRep_Party_Id"

[@jacekkangaroo4402]

@@MrAndrewjdavis yes and no :-) if you want to distinguish columns from different tables, you can use table and column aliases, it takes a bit more work but it is better in my opinion, also a column name like "Product_Name" looks ugly on the report for end users, usually it will be renamed as "Name" or "Product name" on reports, not to mention that reports may be created in other languages, what people from English-speaking countries forget often, databases are usually built in English as they are often created by international teams, while reports are created in accordance with local requirements and often have to be created in the official language of a given country

[@TechnoDB]

Wow.. clear explanation with diagrams.

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Thank you Dinesh !

[@fabricejaouen4252]

Very simple video, but extremely clear: it helped a lot before digging into more detailed tutorials. Great work indeed.

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[@fabricejaouen4252]

@@DataAcademyIN : Of course !

[@nitagawade3330]

Big Thank you Sir for such wonderful explaination!!! Waiting for more video with some business cases

[@abuhamza1970]

Absolutely brilliant video. Thank you sir! 🙏

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[@karunaanugo5572]

Really good one for beginners to understand easily

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[@anoniem012]

Thanks finally an English titled video who is actually explained in English.. :) Very well

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[@xudong5269]

you killed the game, my friend!

[@akapurvis1173]

Excellent explanation. Short, sweet, and to the point while covering all the essentials to data modeling. Thx you😉

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[@ongeek9834]

Very helpful and informative, Please keep educating people. God Bless.

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[@Eva.261]

Simply the BEST. Thank you!

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[@sudharshanchakrapani7111]

Wonderfull explanation Sir. Thank you very much for making the video.

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[@abdullahalkafi5584]

Awesome 10 minutes 👍

[@geraldowusuansah3673]

Well understood. Thanks for the lecture

[@junkingjunking8477]

Nice explanation. Thank you, sir😊

[@arunmehta8234]

Awesome video. Very Explanatory.

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[@balasubramanianilangovan888]

I appreciate your efforts to prepare such a wonderful video!

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Thank you for your encouraging comments.

[@zangorjanc8149]

There can be datatypes used in logical model too! And deffreance betwene logical and physcal model its just that physcal name of atributes are just more relateble to names that we will use in our DATABASE...

[@DataAcademyIN]

I agree with you that this is allowed, but I feel that it defeats the purpose of a Logical schema. A Logical schema should NOT be specific to a database. Hence, if we were to mention the Datatype, it should be a generic datatype. For example - A datatype of STRING maybe used in Logical schema, whereas in the Physical schema, this may map to either a VARCHAR or TEXT datatype (PostgreSQL Datatypes).

[@asadalisoomro8937]

very helpul and conceptual video. Thanks a lot buddy.

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Thank you Asad !

[@nitagawade3330]

Big Thank you sir for such a wonderful explantion......waiting for more video wid business cases

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[@sarahahmed2112]

Very helpful, clear and detailed! Thanks a lot.

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[@charujain7165]

Very well explained. Thanks !!

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[@rasthana]

Very useful video. Thanks for your efforts in sharing this knowledge.

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[@sravanthiakula1923]

Very well explained and all the details are clearly described. Subscribed😊

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[@itishreenayak5984]

such a clear description, thanks

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[@kajalpundir2423]

Commendable explanation..please upload more videos ...of business intelligence

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Thank you Kajal. Please do Like, Share & Subscribe. I am working on content that includes end to end DWBI with real-world data. So stay tuned 😎

[@radhikasrinivasa3068]

Thanks a lot!! I'm not from science background, but still could understand clearly!!

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[@pinkldy100]

Great quick intro to the different levels. Thank you!

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[@mounichowdary8004]

You did a great job, your explanation is too good thank you!!

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[@marycross5526]

Thank you so much. This was very helpful.

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[@saumyojitdas4212]

Cleared my doubt. Excellent video.

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[@KJOB]

You saved me a lot of time man, thanks

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[@seanjharrs]

Great Presentation , covers all the important points, many thanks

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[@Rowlands-ml3ib]

Super helpful and clearly explained! 😊

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[@estebanlopez1701]

This is just brilliant, keep it up

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Thank You :)

[@parshubhai9351]

Very nice explained 😌😌 thanks for this buddy.

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[@sohanchowdhury3416]

Very well explained.. Good way of explaining as well.. Great video 👍

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Thanks a lot 😊

[@nathankomer8699]

Thank you, this is a consize and easy to process introduction!

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[@suniait50189]

Very nicely explained . Superbbb :)

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[@muhammadlukysyahir305]

Thank you very much, this video really help my work

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[@ruthmk]

Thanks very insightful

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[@YasirAli-ot3uz]

Best explanation ever

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[@vijayotnm]

Excellent, thank you

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[@rhyme6300]

Very clear, thank you

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[@dksankari6147]

Thank you sir. Very good explanation

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[@Shades.of.life.by.Vandana]

very good and very well explained in clear english

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[@amisam2215]

Really cool explanation!!!

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[@digigoliath]

Clear & Concise. Great job & TQ!!

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[@digigoliath]

@@DataAcademyIN You already have a new subscriber & I will be back for more!

[@try010]

Many thanks man This helped me !

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[@Cecy_Magaji]

Insightful ❤

[@rolandhortea]

Thanks! Very helpful for a beginner :D

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[@kalkibhavsar8208]

Very Helpful!

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[@Runtothemusic]

Excellent explanation, very easy to understand. Thank You.

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[@richie1603]

Crystal clear explanation

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[@kjbiliks]

Very informative thanks

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[@bobbyvenkatesan3657]

Omg . very clear.thank you so much

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[@srinivasaraoullipalepu7389]

Thank you the explanation is good enough and clear.

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