SCD: Slowly changing dimensions explained with real examples

[@TechCoach]

Guys please support me in building my new youtube channel "An Indian Abroad " by watching subscribing and sharing with your friends kzbin.info

[@andrewomofonma7148]

what about a situation where by the current snapshot doesn't contain the last data especially in a case like the employee is fired or left the job and that information is reported in a different table .How do you update the previous date and at that point will you maintain the current flag as 'Y' or'N'

[@himanshudhiman761]

SCD explained very well and with so much patience. !! Much appreciated... Thanks for sharing the knowledge on it

[@TechCoach]

Thanks for the kind words buddy :) Please consider subscribing to my other channel as well it will really help me kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@mariejoycesantiago]

This is very informative, very easy to understand. Thank you so much for this!

[@TechCoach]

I am glad I could help :)

[@kanojdebbarma6936]

Very well explained. I had an issue where I had implemented SCD 1. Later SCD 2 replaced it. I would say SCD 4 is a more elegant way. Great job! thanks for this video

[@anandbgrowthcoach]

Great video. Thanks a lot Vivek for explaining very simply and clearly!

[@TechCoach]

I am glad Anand I could help :)

[@majidgolnar7415]

Hi Vivek, Thank you for this video. It helps me a lot. I have watched several training in SCD but they made me much more confuse. But this video helped me to understand. Just I want to mention that as far as I know the surrogate key should change in each update in SCD2.

[@TechCoach]

Thanks Majid, with every change ( insert in ScD 2 the surrogate key should increment)

[@shrutisinghal8556]

Superlike!! What I like about your videos is that you give real examples.

[@TechCoach]

Thanks a lot shruti :)

[@sravanreddy8802]

Thanks a lot for this video. It really helped me understand SCD and its various types.

[@TechCoach]

I am glad I could help :)

[@golden9161]

Very crisp and to the point.

[@TechCoach]

Thanks buddy for the kind words, Please consider subscribing to my other channel as well, it will really help me :) kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@TechCoach]

@golden, please consider subscribing to my new channel it will really help me kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@vaibhavagrawal953]

Very precisely and beautifully explained. I was able to understand each and every thing you explained. 👏

[@yashodhanjoshi781]

Thank you! Super concise and clear

[@TechCoach]

Thanks a lot buddy :)

[@mandardegvekar997]

Simple and easy !! Great work

[@TechCoach]

Thanks a lot for the kind words Mandar :)

[@w0nderw0manjy]

Awesome explanation.. totally worth it!

[@TechCoach]

Thanks Jyoti for the kind words. Please consider subscribing to my other channel as well. It will really help me. kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@uditech7736]

Simple and clear explanation. Thank you Tech Coach.

[@TechCoach]

Thanks Udi Tech for the kind words, I have a small request.I am working on this new channel and will really appreciate if you watch and subscribe to it kzbin.info/www/bejne/oGi1o6t7o7-Sbqc

[@pinakeshchandradas7617]

Thanks dada (bhaiya) for your clear and concise approach to scd.

[@TechCoach]

Thanks buddy for the kind words. Please consider subscribing to my other channel as well kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@sivanjaneyareddy]

The way of explanation is damn clear... Very useful for beginners. Thanks a ton for this video

[@TechCoach]

+Sivanjaneya Reddy M.V. Thanks a lot for the kind words :)

[@TechCoach]

I would love your support for my new channel, Please watch subscribe and share with your friends. kzbin.info/door/oLdaMxhfDgdgIAcRGlUvkg

[@jyotikothari499]

Too good and simple explanation of SCD.. 👍🏻

[@marchanselthomas]

Beautifully explained!

[@TechCoach]

I am glad I could help

[@ririraman7]

It was knowledge rain for me, thank you brother for the social work!

[@monywa2024]

Hello Vivek ..thanks for sharing. I noticed that for SCD Type 3 example (at 14:50) when the salary value changes, you left out to put prev_salary and current_salary in the table although you did explain in your video that if there are more than one column change for each column there must be both previous and current values to be kept in DW.

[@templar273]

best explanation ever you are the best

[@TechCoach]

Thanks a lot Henri :)

[@vishnuvardhanreddy5986]

Superb explanation understand very easily thank you so much bro......

[@TechCoach]

Thanks Buddy

[@atchutharaojami3109]

Excellent performance bro really very nice and clear explanation such containt all the best bro

[@TechCoach]

Thanks Buddy, please consider subscribing to my other channel it will really help me kzbin.info/www/bejne/nYXKZ6F5itqMhZo

[@arunasingh8617]

Amazing Video (y). Get going!

[@TechCoach]

Thanks a lot Aruna :)

[@aliveniveluru9522]

very nice video, good knowledge sharing

[@TechCoach]

Thanks a lot for the kind words. I would really appreciate if you help me in my new Initiative "An Indian Abroad" by subscribing viewing and sharing. kzbin.info

[@VinLopez]

well explained; this SCD types always ask during technical interview.

[@TechCoach]

Thanks Vin for the kind words I have a small request I am working on this new youtube channel, I Would love it if you watch and subscribe to it as well. kzbin.info/www/bejne/fZ-5n2ajhaeFsJY

[@gregorclegane7563]

Lol i was asked this in an inteview. I said I've never heard of it. After watching this video, it turns out that I've been working on SCD for severals years now. 😂😂 I just didn't know they were called as such.

[@vkd9442]

@@gregorclegane7563 exactly bro.. Just now I was asked this.. I said I don't know and searching in KZbin now. Found this

[@job_updates_with_subham]

Very well explained with nice example 🙂 thanks

[@TechCoach]

Thanks a lot buddy :)

[@ngowriraj]

Very Good with example & explanation

[@shukriabdulahi7492]

clear and practical examples. good job

[@TechCoach]

@shukri thanks for the kind words. Please consider subscribing to my other channel as well. It will really help me. kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@Buzzingfact]

great explanation... thanks for the video

[@TechCoach]

Thanks a lot buddy, I am glad I could help :)

[@KalyanS]

nice explanation with examples

[@praneethbhat6361]

good explanation . Really helpful for me. Tq

[@TechCoach]

I am glad I could help :)

[@rajatnagwal7881]

amazing explaination.great job bro

[@TechCoach]

Thanks a lot buddy :)

[@sanjayMishra-vs9um]

Thank you very much for this simplest explanation I could find over youtube! Awesome :)

[@TechCoach]

Thanks Sanjay for the kind words :)

[@mounikayathakula8585]

Hi..Thank you so much for this valuable information that helps me a lot

[@ushasingu1757]

Very well explained. Thank you!

[@TechCoach]

Thanks Usha for the kind words. I have a small request I am working on this new channel "An Indian abroad" and will really appreciate if you watch and subscribe to it. kzbin.info/www/bejne/Z2KnfGClrrekopI

[@nehabansal7609]

Best explanation ever

[@TechCoach]

Thanks Neha , Please consider subscribing to my other channel as well it will really help me :) kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@nehabansal7609]

@@TechCoach done :)

[@MsMegha16]

very nicely explained. Thankyou

[@TechCoach]

Thanks a lot Megha

[@tanushreenagar3116]

Nice sir 👌 👍 👏 😀 thanks 😊

[@TechCoach]

Thanks a lot Tanushree :)

[@vijaykhanna7263]

Nicely explained.

[@TechCoach]

Thanks Vijay for the kind words :) please consider subscribing to my other channel as well.it will really help me kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@sreejithsreedhar05]

You deserve much more viewers than now since you narrated the concepts very well,I like your videos, Thanks, dear friend.

[@TechCoach]

Thanks a lot sreejith for the kind words, you made my day. I have around 80 videos and your comments boosted my confidence to make many videos. Thanks a lot again.

[@hirenparikh1364]

Excellent Explanations Skills!!!

[@TechCoach]

Thanks Hiren for the wonderful comment. I have a small request I am working on this new youtube channel and will really appreciate if you watch and subscribe to it. kzbin.info/www/bejne/fnO0eZihgpaIaMU

[@aishwaryavakhariya3999]

Thank you it is very helpful for me

[@TechCoach]

Thanks buddy, I am glad I could help :)

[@4rmtinc]

Thanks. Nice and concise explanation of the different types of SCD.

[@TechCoach]

Thanks a lot for the kind words :)

[@TechCoach]

Thanks a lot for the kind words :)

[@pranavbhat92]

Thank you for the clear explanation!

[@TechCoach]

Thanks Pranav for the kind words, This video on Indexing may interest you as well. kzbin.info/www/bejne/Zomck5WqrLmhq6c

[@vasupradhaswamy769]

thank you for such good video

[@TechCoach]

Thanks Vasupradha :)

[@NeuraKnowledgeTV]

Well explained

[@TechCoach]

I am glad I could help

[@kishanjadhav8944]

Very well explained . Thanks

[@Dinaklalthillankeri]

Very nice man❤️❤️

[@TechCoach]

Thanks buddy, please consider subscribing to my other channel as well. kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@vivekgambhire1379]

Really great video ,easy to understand

[@TechCoach]

@Vivek, Thanks for your kind words. It made my day :) Please consider subscribing to my other channel as well. It will really help me. kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@melvin9993]

Good Job!

[@TechCoach]

Thanks buddy

[@sikandarbaig2125]

thank you so much very help full

[@TechCoach]

I am glad I coulf help :)

[@mohanrajmech89]

This is some wonderful explanation. And they way you explain is so easy to understand and follow. Thank you so much Bro!

[@TechCoach]

Thanks Mohanraj for the lovely words, I am glad I could help :)

[@diptianjarlekar4480]

Very nice explanation and real life examples ..kudos

[@TechCoach]

Thanks Dipti for the kind words, I have a small request. I am working on this new youtube channel and will really appreciate if you watch and subscribe to it. kzbin.info/www/bejne/f4GVh6Fsn7Brfsk

[@MitziMuzic]

Too good 👍👍

[@TechCoach]

Thanks buddy :)

[@susilkumarsahoo2532]

Nice once Vivek......Keep it up

[@Anilkumar-kp8ee]

Vivek brother it's awesome

[@TechCoach]

Thanks a lot for the kind words :)

[@jaivalsartandmore....1199]

Much appreciated ....

[@TechCoach]

I am glad I could help

[@shubhamchouhan8149]

please upload videos regarding SCD based scenarios wth both SQL and informatica (two approaches) your explanation methodology is very good.

[@TechCoach]

shubham chouhan Sure Shubham I will work on it soon

[@vaibhavaher7139]

9:52 ID Column I assume as a Primary key in that case in Data warehouse table new ID gets generated or Same ID get repeated?

[@they_callme_kkc6812]

Thank you so much bhai 💙

[@TechCoach]

Thanks buddy :)

[@bhaskerreddyvade]

It’s pretty cool thank you

[@TechCoach]

Thanks Bhaskar for the kind words :) Please consider subscribing to my other channel as well. It will really help me. kzbin.info/www/bejne/bHiUqXqfYqlopdk

[@bhaskerreddyvade]

I shared to few members

[@mullaipugazhendi3236]

Excellent 😊

[@ParthSahakne]

Very nicely explained

[@TechCoach]

Thanks Parth for the kind words :)

[@piraviperumal2544]

Good one!

[@TechCoach]

Thanks a lot buddy for the kind words :)

[@sasidharsamala1889]

Simply awesome

[@mohammadjamshaidsayeed6564]

Thanks, Vivek, really its very good video to understand SCD. If you have any video with the practice session plz share a link for the same which helps more clear.

[@TechCoach]

Thanks Mohammad , Unfortunately at this moment i don't have a practice video on it.

[@chandu9143]

Nice explanation sir good 👌

[@TechCoach]

Thanks buddy for the kind words :)

[@AliRaza-nl6tf]

Informative.

[@TechCoach]

Thanks buddy for the kind words :)

[@vishaljhaveri7565]

Thank you!

[@TechCoach]

I am glad I could help :)

[@JessicaRocha-dz4cw]

Thank you so much for you explanation, it was very clear!

[@TechCoach]

Thanks a lot for the kind words, I have a small request I am working on this new youtube channel " An Indian Abroad " and will really appreciate if you watch and subscribe to it. kzbin.info/www/bejne/Z2KnfGClrrekopI

[@AliciaMarkoe]

Thank you 🦋

[@baluhadoop4518]

thats awesome...very well explained..thank you very much bro.

[@TechCoach]

Thanks buddy for the kind words, this video on indexing may interest you as well. kzbin.info/www/bejne/Zomck5WqrLmhq6c

[@osutuba]

Thank you for not having an accent so thick that you can't be understood! There are times that I have pulled videos like this and the speakers accent is so bad that they would be better off speaking their native language!

[@TechCoach]

I am glad Russel I could help :)

[@RealLifeAnnu]

Good info

[@KalyanS]

Nice explanation

[@nishanthkumar4743]

Well explained vivek... Big thumps up

[@TechCoach]

Thanks a lot for the kind words Nishanth :) This video may interest you as well . kzbin.info/www/bejne/a5_JeaCebbOmftk

[@spankyx8606]

thanks for the excellent lesson and clear sound

[@Akshay50826]

Thank you so much 😊

[@ahmadsyed9405]

excellent stuffs and nicely explained.

[@TechCoach]

Thanks Ahmad Syed for the kind words. I have a small request, I am working on this new channel please do watch and subscribe to it. Your support is my motivation. kzbin.info/www/bejne/gKDFgIGfi7x0b7M

[@lemmiTry]

Very informative and concise video. Thanks!

[@TechCoach]

Thanks for the kind words.I have a small request, I am working on a new channel " An Indian Abroad" and it will really help me if you watch and subscribe to it. kzbin.info/www/bejne/Z2KnfGClrrekopI

[@rahulsalve7543]

Very nice video...just remove subtitles for better understanding...due to that we can not see the tables

[@TechCoach]

Sure Rahul, Thanks for the inputs :)

[@sridharsrinivasan7203]

why do we need scd 4 when we can use scd 2 to get both historic and current data, by creating indices on the date columns to get latest record ?

[@Ujjwal_dreams]

Dear Sir , is primary or surrogate key in SCD2 will remain same for multiple entry of the same record ? As mentioned in this clip if it will remain same then how will we update the previous record ?

[@TechCoach]

Surrogate key will change, No two rows can have the same surrogate keys

[@raviranjansingh5527]

Great explaining sir ,make more update video sir

[@TechCoach]

Thanks Ravi for the kind words, sure I willwork on them

[@keithdoran728]

Thanks for the clear explanation

[@TechCoach]

You are welcome Keith :)

[@vartikathakur4273]

Hi Vivek, Your video was very helpful. Just one query. In case of SCD 2, can we have duplicate value for id??As it has 123 in all the cases.

[@TechCoach]

In SCD usually you will have a surrogate key to uniqely identify every record also you will have a start_date end_date and /or a flag to identify the old and the latest records :)

[@nagasai6830]

awesome vid

[@Ravikumar-bu7ge]

Very well explained. Thanks a lot..

[@AnIndianAbroadd]

Thanks a lot Ravi for the kind words. I have a small request, I am working on this new channel and will really appreciate if you watch and subscribe to it. kzbin.info/www/bejne/Z2KnfGClrrekopI

[@ladysay3]

Thanks. Great video.

[@TechCoach]

Thanks buddy for the kind words :)

[@9704004030]

Can you do a video on Change data capture...

[@TechCoach]

Sure buddy I will work on it :)

[@jahangirkabir9271]

great simple explanation!!

[@TechCoach]

Thanks a lot for the kind words :)

[@TechCoach]

I would love your support for my new channel, Please watch subscribe and share with your friends. kzbin.info/door/oLdaMxhfDgdgIAcRGlUvkg

[@fabiosangiorgi3596]

Excellent video. Only question is on scd 6. Why did you set old value equal to current value in last row?

[@siddharthbhargava4026]

Hi Vivek..very nice explanation..!! I have one question - for SCD 4 why we need to maintain two different tables for latest snapshot and history, we can just create a view on our SCD2 dim with condition 'to_date='12-dec-99' for the latest snapshot data and normal 'As-is' view for historical data. Please let me know if I'm missing anything. Thanks again..every video of yours is really helpful.

[@TechCoach]

A view will run the underlying query everytime it is accesed which may become a big performance hit if it is called often.

[@aamirirfan8768]

Once again Good work Vivek

[@TechCoach]

Thanks a lot for the kind words. I would really appreciate if you help me in my new Initiative "An Indian Abroad" by subscribing viewing and sharing. kzbin.info

[@fahadmahmood7150]

Explanation was very precise and through the point.I really like the way you explained..!! Could you please explain the concept of granularity in depth and its significance.. Thanks in advance.!

[@chinnu2894]

If my source table has no date column, Can we apply SCD 2 on my source table to update?

[@TechCoach]

You can use the date when you recieve the row for the 1st as created date, whenever you recieve an update for that row you can use that as updated date. The only conern here is if the update to your olap system is not on a daily basis your created ( start) and updated (end) date may not show the perfect picture.

[@chinnu2894]

Thank you for clarification

[@dataisfun4964]

Beautiful

[@dhanarajuramadi4733]

Thank you , keep adding more ..👍

[@TechCoach]

dhanaraju ramadi Thanks for the kind words. I will be uploading more such videos soon.

[@gaurisharma6331]

in type2 SCD the surrogate key should also change for new record.In the video it still shows key as 123 for all three records.Surrogate Key is Primary key hence there cannot be duplicates