SCD: Slowly changing dimensions explained with real examples

The video explains what are slowly changing dimensions, Their relevance in data warehousing and which SCD type should be used in what kind of data scenario.
The video Explains below with real project examples.
#SlowlyChangingDimension #SCD2 #TechCoach
SCD 0 - Passive method (No change in data)
SCD 1 - Overwriting the old value (Latest Record Only)
SCD 2 - Creating a new additional record (Maintains History)
SCD 3 - Creating an additional Column (Rarely Used)
SCD 4 - Using history table
SCD 6 - The hybrid approach

[@TechCoach]

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[@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 :)
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[@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

[@mariejoycesantiago]

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

[@TechCoach]

I am glad I could help :)

[@anandbgrowthcoach]

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

[@TechCoach]

I am glad Anand I could help :)

[@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
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[@shrutisinghal8556]

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

[@TechCoach]

Thanks a lot shruti :)

[@jyotikothari499]

Too good and simple explanation of SCD.. 👍🏻

[@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)

[@aliveniveluru9522]

very nice video, good knowledge sharing

[@TechCoach]

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[@ngowriraj]

Very Good with example & explanation

[@vaibhavagrawal953]

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

[@job_updates_with_subham]

Very well explained with nice example 🙂 thanks

[@TechCoach]

Thanks a lot buddy :)

[@shukriabdulahi7492]

clear and practical examples. good job

[@TechCoach]

@shukri thanks for the kind words.
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[@KalyanS]

nice explanation with examples

[@rajatnagwal7881]

amazing explaination.great job bro

[@TechCoach]

Thanks a lot buddy :)

[@Buzzingfact]

great explanation... thanks for the video

[@TechCoach]

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

[@sravanreddy8802]

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

[@TechCoach]

I am glad I could help :)

[@vishnuvardhanreddy5986]

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

[@TechCoach]

Thanks Buddy

[@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
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[@tanushreenagar3116]

Nice sir 👌 👍 👏 😀 thanks 😊

[@TechCoach]

Thanks a lot Tanushree :)

[@susilkumarsahoo2532]

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

[@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]

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[@mandardegvekar997]

Simple and easy !! Great work

[@TechCoach]

Thanks a lot for the kind words Mandar :)

[@praneethbhat6361]

good explanation . Really helpful for me. Tq

[@TechCoach]

I am glad I could help :)

[@arunasingh8617]

Amazing Video (y). Get going!

[@TechCoach]

Thanks a lot Aruna :)

[@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.

[@ririraman7]

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

[@vijaykhanna7263]

Nicely explained.

[@TechCoach]

Thanks Vijay for the kind words :) please consider subscribing to my other channel as well.it will really help me
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[@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
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[@mounikayathakula8585]

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

[@w0nderw0manjy]

Awesome explanation.. totally worth it!

[@TechCoach]

Thanks Jyoti for the kind words.
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[@templar273]

best explanation ever you are the best

[@TechCoach]

Thanks a lot Henri :)

[@chandu9143]

Nice explanation sir good 👌

[@TechCoach]

Thanks buddy for the kind words :)

[@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.
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[@marchanselthomas]

Beautifully explained!

[@TechCoach]

I am glad I could help

[@Anilkumar-kp8ee]

Vivek brother it's awesome

[@TechCoach]

Thanks a lot for the kind words :)

[@MsMegha16]

very nicely explained. Thankyou

[@TechCoach]

Thanks a lot Megha

[@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 :)

[@VinLopez]

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

[@TechCoach]

Thanks Vin for the kind words I have a small request
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[@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 RUclips now. Found this

[@golden9161]

Very crisp and to the point.

[@TechCoach]

Thanks buddy for the kind words,
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[@TechCoach]

@golden,
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[@vivekgambhire1379]

Really great video ,easy to understand

[@TechCoach]

@Vivek, Thanks for your kind words.
It made my day :)
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[@Dinaklalthillankeri]

Very nice man❤️❤️

[@TechCoach]

Thanks buddy, please consider subscribing to my other channel as well.
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[@hirenparikh1364]

Excellent Explanations Skills!!!

[@TechCoach]

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[@nishanthkumar4743]

Well explained vivek... Big thumps up

[@TechCoach]

Thanks a lot for the kind words Nishanth :)
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[@NeuraKnowledgeTV]

Well explained

[@TechCoach]

I am glad I could help

[@AliRaza-nl6tf]

Informative.

[@TechCoach]

Thanks buddy for the kind words :)

[@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.

[@kishanjadhav8944]

Very well explained . Thanks

[@mullaipugazhendi3236]

Excellent 😊

[@ParthSahakne]

Very nicely explained

[@TechCoach]

Thanks Parth for the kind words :)

[@yashodhanjoshi781]

Thank you! Super concise and clear

[@TechCoach]

Thanks a lot buddy :)

[@MitziMuzic]

Too good 👍👍

[@TechCoach]

Thanks buddy :)

[@nehabansal7609]

Best explanation ever

[@TechCoach]

Thanks Neha , Please consider subscribing to my other channel as well it will really help me :)
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[@nehabansal7609]

@@TechCoach done :)

[@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.
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[@melvin9993]

Good Job!

[@TechCoach]

Thanks buddy

[@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.

[@ahmadsyed9405]

excellent stuffs and nicely explained.

[@TechCoach]

Thanks Ahmad Syed for the kind words.
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[@aishwaryavakhariya3999]

Thank you it is very helpful for me

[@TechCoach]

Thanks buddy, 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

[@RealLifeAnnu]

Good info

[@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 :)

[@sanjayMishra-vs9um]

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

[@TechCoach]

Thanks Sanjay for the kind words :)

[@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.
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[@vasupradhaswamy769]

thank you for such good video

[@TechCoach]

Thanks Vasupradha :)

[@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 :)

[@sujaa1000]

Thank you Vivek! this was very helpful.
Regards,
Sujaa

[@TechCoach]

Thanks Sujaa for your constant feedback, It helps me going :)

[@KalyanS]

Nice explanation

[@pmrexplores]

Awesome bro...keep doing 👍🏼

[@AnIndianAbroadd]

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.
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[@piraviperumal2544]

Good one!

[@TechCoach]

Thanks a lot buddy for the kind words :)

[@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]

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[@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 :)

[@they_callme_kkc6812]

Thank you so much bhai 💙

[@TechCoach]

Thanks buddy :)

[@sikandarbaig2125]

thank you so much very help full

[@TechCoach]

I am glad I coulf help :)

[@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 :)

[@fabiosangiorgi3596]

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

[@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.
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[@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.
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[@sasidharsamala1889]

Simply awesome

[@raviranjansingh5527]

Great explaining sir ,make more update video sir

[@TechCoach]

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

[@pranavbhat92]

Thank you for the clear explanation!

[@TechCoach]

Thanks Pranav for the kind words, This video on Indexing may interest you as well.
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[@jaivalsartandmore....1199]

Much appreciated ....

[@TechCoach]

I am glad I could help

[@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

[@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.!

[@nagasai6830]

awesome vid

[@jahangirkabir9271]

great simple explanation!!

[@TechCoach]

Thanks a lot for the kind words :)

[@TechCoach]

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[@bhaskerreddyvade]

It’s pretty cool thank you

[@TechCoach]

Thanks Bhaskar for the kind words :)
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[@bhaskerreddyvade]

I shared to few members

[@houstonfirefox]

Two Words: Volume Leveling! Had to crank my speakers up to 100% just to barely hear you

[@AliciaMarkoe]

Thank you 🦋

[@spankyx8606]

thanks for the excellent lesson and clear sound

[@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.
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[@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?

[@9704004030]

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

[@TechCoach]

Sure buddy I will work on it :)

[@neerajrenupranav]

what is slowly changing grain is it same as slowly changing dimension?

[@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 ?

[@keithdoran728]

Thanks for the clear explanation

[@TechCoach]

You are welcome Keith :)

[@Ranvir786]

Very well Explanation. Thank you so much :)

[@TechCoach]

+Ranvir singh Thanks a lot Ranvir Singh :)

[@dhanarajuramadi4733]

Thank you , keep adding more ..👍

[@TechCoach]

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

[@Ahlambabes]

Thank you very much for your explanation 👍

[@TechCoach]

Thanks for the kind words :)