This is one of the best videos on this topic out there. Keeps it simple, but still clearly explains the structures and how it works. Very nice work, sir!
Elegant explanations like this are truly timeless, shifted through a bunch of videos attempting to word this same information in, like, double the time, and yet STILL failed to deliver as well as you did, sir, truly thank you.
Man, you fully rocked on demonstration the difference between Clustered Index and non-clustered Index ! This helps me on preparing for the interview questions !
Wow, great explanation, love the usage of visualization of the data stored in structures. I've had an idea about how indexes work, but after watching this I'd be able to explain it to my grandmother (:
You are awesome. Without ppl like you I would not have been able to build my skill at this level and get the job I now have. It all goes far. Thank you very much!
I have been looking for different sources just to objectively understand the difference between clustered and non-clustered indexes and to know how they really work. This very short and precise video have put an end to all of my Qs. Thank you.
Incredibly beautiful explanation of clustered and non-clustered indexes. There is a lot of material in those first 6 minutes, and I admit I had to pause several times to absorb it and move, but hey who is complaining when you get there eventually.
Man, you've researched a lot such a quality video, you just kept answering all of the questions that I had referencing blogs and videos. God bless you brother
For 10 years, I've learned the definitions of both coz i just couldnt grasp what it actually meant but the 2nd time watching this video, you have finally made me understand
This video might save my advanced databases test grade tomorrow. I hate when the prof. doesn't explain stuff clearly enough for me. Thanks for the video - liked and subbed! :)
I liked the visualizations best. The phrase "a picture is worth a thousand words" definitely applies to this video. Thanks for the concise and well delivered video. And, please, ignore the "Nicolas Cage" references below.
This video helped me ALOT, I've been watching many videos and this really clearly cleaned things up for me. The moving graphics were a big part of that too. thankyou!
A lot wannabe blogs explained it with much much worse example, even a lot that even do not define from the scanning process through accumulate the results. Nice vid!
Thanks for the video, the phonebook example was good and easy to understand. From my experience, things sometimes get confusing because of different default behavior of different RDBMS - some automatically create clustered indexes for primary keys, some automatically create indexes on foreign keys, and some don't do any of this. So, sometimes you might get unpleasant surprises and performance issues if you have to deal with a RDBMS which you don't have experience with.
Thank you! I interact with a SQL database often, but indexes are not something I deal with enough. This was great information and exactly what I needed (:
Very good explanation ;) My tutors have tried to explain clustering and indexing for me multiple times, without my understanding. But your examples and explanation of the differences really helped
Thank you very much, I have been reading at many places but no one explained with images. Greate video. Even MSDN documentation doesn't have this much information.
I am just starting to learn SQL. My dad is going to give me lessons, but this certainly helped me understand some of the terminology. I figured since I am already a Network Engineer who is two months away from his bachelor's degree, I want to make myself more valuable.
Thanks, Jon. I liked the visual example of the phone book - helped me to understand how indexes work without getting bogged down in bytes and pointers.
Sir 5/5 for this video , the visualization was a gr8 help in understanding . I had some knowledge that B-tree was the index data structure but could not grasp it , but after your video it helped me a lot. Plz do post more such videos.
Thanks Voluntary.. This video was awesome.. I have been a years in Database but its first time I came to know what index is all about.. Thanks for your great example and way presentation.. U guys ROCK!
Perfectly concise and to the point. Well articulated and the visualizations help dramatically. Thank you very much for your contribution to the DATA world :)
what a brilliant explanation! subscribed! Looking further for your explanation about physical and logical operators in SQL Server and when is the best situation to use it (Nested loops, Hash Match, Merge Join, etc) Greetings from Indonesia!
This is extremely well explained. Your schemas are self explanatory. Thank you! If I understood correctly, both clustered and non-clustered indexes are Balanced-Trees, correct?
If the data has uniform distribution on the key, then I believe the structure would meet the definition of a balanced tree; otherwise, I don't think there are constraints restricting it to that structure.
Bravo! A very good explanation, but it would help a lot to specify when the subject changes: for example when we switch to FILTERED INDEXES and then to INDEXES WITH INCLUDES COLUMNS... But then again, thanks a lot, a very good explanation!!!
Hi, your video helped me a lot! You were able to explain the subject in a clear manner. so that anyone can understand it, excellent video , I am very grateful, thanks for sharing :)
This video is well explained... I don't understand 148 dislikes... if he's talking about things you don't understand: then you need to go to lower level explanations... and then come back here.
No nonsense talk or waste of time.
Straight to the point with excellent presentation examples.
Good Work. Thank you very much.
It is hard to believe that this video is from 8 years ago. Still the best video explaining the basics of both these indexes even in 2022.
Is it just me or did his eyebrows grow, during the course of this video and its edits?
This is one of the best videos on this topic out there. Keeps it simple, but still clearly explains the structures and how it works. Very nice work, sir!
I've watched over 10 video. This is by far the most clear structured introduction to indexes! Thank you!
Elegant explanations like this are truly timeless, shifted through a bunch of videos attempting to word this same information in, like, double the time, and yet STILL failed to deliver as well as you did, sir, truly thank you.
Never before did Nicolas cage explain something so well, good job Nic.
joking :D it was so helpful. thanks.
+Abd El-Rahman Ibn Omar lol
kkkkkkkkkkkkkk
And Nicolas Cage old has an odd sort of hottness. :)
HahhHahahah XD exactly
ha!!
Man, you fully rocked on demonstration the difference between Clustered Index and non-clustered Index ! This helps me on preparing for the interview questions !
I always come back to this video when I need a refresher and it never fails to help me. Thanks again!
Great explanation! This is the type of explanation that every developer can understand, no matter their programming level
Wow, great explanation, love the usage of visualization of the data stored in structures. I've had an idea about how indexes work, but after watching this I'd be able to explain it to my grandmother (:
You are awesome. Without ppl like you I would not have been able to build my skill at this level and get the job I now have. It all goes far. Thank you very much!
kzev You're welcome!
I have been looking for different sources just to objectively understand the difference between clustered and non-clustered indexes and to know how they really work. This very short and precise video have put an end to all of my Qs. Thank you.
Incredibly beautiful explanation of clustered and non-clustered indexes. There is a lot of material in those first 6 minutes, and I admit I had to pause several times to absorb it and move, but hey who is complaining when you get there eventually.
Man, you've researched a lot such a quality video, you just kept answering all of the questions that I had referencing blogs and videos. God bless you brother
For 10 years, I've learned the definitions of both coz i just couldnt grasp what it actually meant but the 2nd time watching this video, you have finally made me understand
I understood more from this video than from a whole semester of lectures. Thanks!
You're very welcome! I'm glad it helped you understand these concepts.
the best tutorial i have ever seen for MS SQL indexes, good job my friend
Thank you very much! I'm glad it helped you.
This video might save my advanced databases test grade tomorrow. I hate when the prof. doesn't explain stuff clearly enough for me. Thanks for the video - liked and subbed! :)
I liked the visualizations best. The phrase "a picture is worth a thousand words" definitely applies to this video.
Thanks for the concise and well delivered video. And, please, ignore the "Nicolas Cage" references below.
This is all I was looking for. Best explanation about behind the scenes of indexing.
I had a hard time understanding the difference until I watched your video. Thanks for the simple explanation!
Excellent video. Much easier with visuals than reading articles. Keep up the good work.
Wow, I could not image a man can explain it in such a simple way! Thank you!
This video helped me ALOT, I've been watching many videos and this really clearly cleaned things up for me. The moving graphics were a big part of that too.
thankyou!
I know this has been up for 6 years but THANK YOU!!!!
A lot wannabe blogs explained it with much much worse example, even a lot that even do not define from the scanning process through accumulate the results. Nice vid!
Thanks for the video, the phonebook example was good and easy to understand.
From my experience, things sometimes get confusing because of different default behavior of different RDBMS - some automatically create clustered indexes for primary keys, some automatically create indexes on foreign keys, and some don't do any of this. So, sometimes you might get unpleasant surprises and performance issues if you have to deal with a RDBMS which you don't have experience with.
One of the best tutorials I've ever seen. Thank you so much. Brief and infomative. Animations are very helpful also.
You're welcome!
Bravo! That is most succinct explanation of clustered indexes I have ever read or seen. I've got it now :-)
Thank you! I interact with a SQL database often, but indexes are not something I deal with enough. This was great information and exactly what I needed (:
Thank you so much for posting this! I was having a hard time understanding the differences between the two until i watched the video.
This man knows what he talks about - great. Waiting other videos.
This has been a great straightforward video that really helped explain the difference. Thank you keep up the good work!
This is very clear, finally someone who explained in a clear simple and efficient way the index. thanks again!
I would love to see more videos on Ambiguous concepts of SQL on this channel thanks man.
Very good explanation ;) My tutors have tried to explain clustering and indexing for me multiple times, without my understanding. But your examples and explanation of the differences really helped
Excellent video. Finally I could find a video which is so crisp and clear. Thanks a ton!!
Thank you very much, I have been reading at many places but no one explained with images. Greate video. Even MSDN documentation doesn't have this much information.
wow....best explanation. I'm studying for the mcsa exam. I've been struggling with this topic. thanks!!
its simple to understand with graphical representation. Keep up with them. Great work.
I am just starting to learn SQL. My dad is going to give me lessons, but this certainly helped me understand some of the terminology. I figured since I am already a Network Engineer who is two months away from his bachelor's degree, I want to make myself more valuable.
Never get this clear until this video. Nice!
Really amazing, I was not aware that we can define type of index while applying primary key or unique constraints. thanks for amazing explanation :)
Best indexing explanation I've seen on internet.
Most concise and easy to understand video out there. Thx man!
Perfect explanation I've ever seen before! Please do not stop!
Thanks, Jon. I liked the visual example of the phone book - helped me to understand how indexes work without getting bogged down in bytes and pointers.
You're very welcome! That's exactly what I was going for.
Very consistent video. I hope you will add more on this topic. thank you very much
This is a fantastic explanation that a lowly analyst like me can understand :)
you have saved my life !!!!! genius explanation. I have been struggling to understand this for months after months
Thank you for painting and diving deep in details of indexes!
Thank you!! I particularly liked your examples and your methodical delivery of the information. I found the examples to be very helpful as well!
it can't be better explained, excelent work
Excellent explanation. I don't think this can be described any better. Great visuals. Thank you so much
Nicely put.. Specially graphical visual are the one which makes one understand much better .. .Thank you so much ...
Awesome video. Amazing how easy this guy explains such tricky material. Brilliant! :)
Sir 5/5 for this video , the visualization was a gr8 help in understanding . I had some knowledge that B-tree was the index data structure but could not grasp it , but after your video it helped me a lot. Plz do post more such videos.
Thanks Voluntary.. This video was awesome.. I have been a years in Database but its first time I came to know what index is all about.. Thanks for your great example and way presentation.. U guys ROCK!
You're welcome!
Very well illustrated and explained thoroughly. Well done.
Never it was explained so well by others. Thank you !!!
Perfectly concise and to the point. Well articulated and the visualizations help dramatically. Thank you very much for your contribution to the DATA world :)
Nice, clear delivery, good explanation. And he said "zed"! He speaks proper English..!
Best explanation i have seen for this topic. Thumbs up man.
This is very useful. I now understand non-clustered indexes. Thank you
Great video, thank you for creating this and explaining the concepts in a concise and visual manner.
This is awesome, I referred lost video but this one really hits me. This is next level explanantion.
Great stuff, made so much more sense then the books i have read.
All it takes is one "ah-ha!" moment, no matter where it comes from. :) Thanks for watching!
Great work, learned quite a lot about such a important topics in database the slides and visual explanation was piece of master piece
really awesome explanation of a concept that I come across every day that has perplexed me to date... thank you sir !
You are so chill bro, thanks for the video.
Very Professional, clear and informative; I also loved the video animations. Thank you
You're welcome!
YOU are the my hero today. I love your slow and clear explanations. Mil besos.
You're welcome! I'm glad this video helped you.
what a brilliant explanation! subscribed!
Looking further for your explanation about physical and logical operators in SQL Server and when is the best situation to use it (Nested loops, Hash Match, Merge Join, etc)
Greetings from Indonesia!
Thank you for a great video. But a Heap table is defined as a table without a Clustered Index and not just an index. Nonetheless, a great explanation.
You're welcome! I can't re-watch the video right now to see if I misspoke, but yes, you're correct, a heap is a table with no *clustered* index.
Thanks friend, that was a clear and concise explanation with excellent graphics.
I went through many other tutorials, this one really stands out
Very useful video! Your visual graphics made it very simple to understand. Thanks :)
Thanks for this nice video. It was short, simple and easy to understand.
Thanks again!!
You're very welcome! Thanks for watching.
Very helpful especially the way you explain and display the concept.
Excellent clip. I'm new the SQL Server and this information is very informative.
You're welcome! I'm glad it helped you.
Thank you so much, I never forget concept because of your visual representation. It made me to understand , very clearly
Thank you ...very help full and wonderful demo..we are expecting to see more demos off SQL server from you..
Very clarifying video. Many thanks sir. I lost a job oportunity because not knowing the difference between Primary key and Unique key... :(
I'm sorry to hear that, but I'm glad you learned something from the video to prepare you for next time.
The best explanation of the indexes in SQL thank you so much
A great and understandable explanation! An outstanding video. Plz keep it up. Thanx sooooo much
Thank you very much, and you're welcome!
very good! much better then others I've watched
Great video, very well put together and simplifies the topic well.
Awesome presentation, looking forward to watching more of your presentation.
Very useful, thanks for making the video and explaining the concepts so well!
never seen a pretty comprehensive explanation of indices.... until today
This is extremely well explained. Your schemas are self explanatory. Thank you!
If I understood correctly, both clustered and non-clustered indexes are Balanced-Trees, correct?
If the data has uniform distribution on the key, then I believe the structure would meet the definition of a balanced tree; otherwise, I don't think there are constraints restricting it to that structure.
thanks!
Bravo! A very good explanation, but it would help a lot to specify when the subject changes: for example when we switch to FILTERED INDEXES and then to INDEXES WITH INCLUDES COLUMNS...
But then again, thanks a lot, a very good explanation!!!
great visual representation and model choice. subscribed!
Nailed it. You earned a Subscription from a fellow DBA!
Best explanation with visuals. Kudos!!
Hi, your video helped me a lot!
You were able to explain the subject in a clear manner. so that anyone can understand it, excellent video , I am very grateful, thanks for sharing :)
You're very welcome; I'm glad to hear this helped you! Thanks for watching.
Buena explicacion, estoy dando mis primeros pasos en SQL server, y tu explicación me aclaro muchas dudas
Nice Video, The way he explaining is extraordinary
This video is well explained... I don't understand 148 dislikes... if he's talking about things you don't understand: then you need to go to lower level explanations... and then come back here.
Nice Simple explaination on Clustered Indexes and Non Clustered ..