An easier way to explain indexing is to compare it to a book. A book has an index page that shows where to find the topics in a book. So, instead of you going through the entire book to find the topic you're looking for; the index page helps you know where exactly that topic is. Saving you time. Therefore, same thing with SQL queries.
@MM-jr5sr11 ай бұрын
This was a really good comparison,👌🏽
@TuanNguyen-ed9rb7 ай бұрын
I have to disagree with you, your example is intuitive, but it doesn't explain how and why index is fast. Although index has fewer pages than actual table, but what if your table is huge, and index from this table has a lot of pages? it is still slow (of course faster than scan the whole table) to scan all the pages in the index. And in SQL Server, there is a type of index called clustered index, which stores the whole table data in it instead of a seoarate structure beside table data, so it is basically your book with all the pages and no index section. Other point is indexes are stored on disk just like table data, so no hardware advantage. What make index fast is how the data is stored, data is stored in B+ tree structure, which make seek operators fast.
@femikomolafe5604 Жыл бұрын
My name is Femi from Nigeria. I love data analysis because it's enables organizations/businesses get better understanding of its data and make informed decisions with it.
@bryantbimboadeyemo9869 Жыл бұрын
🇳🇬
@LaMeeLifestyle Жыл бұрын
🇳🇬
@LaMeeLifestyle Жыл бұрын
🇳🇬
@vice-108 Жыл бұрын
Who asked?
@umunnahgentle6440 Жыл бұрын
❤
@mahmoudelaraby1599 Жыл бұрын
Dude, you’re here to save the day, you don’t even need someone to ask for something you upload the most awesome content, was in the bank the other day and the banker asked me about DataAnalysis content i was just about to recommend your channel but the guy already knew your channel had the best content, Greeting from Egypt 🇪🇬, God bless you and your family Alex ♥️✨
@angelacatherine375211 ай бұрын
My name is Angela from Nigeria. watching your video has really helped me a lot in my career as a data analyst. Though am taking courses on coursera yet i come to watch your video for more clarity. Thanks Alex.
@nategraham398013 күн бұрын
Yes o! So helpful! Thank you!
@jovialbivouacker99 Жыл бұрын
Hello Alex, I just found out about your channel, and I am impressed with what I have seen thus far. I’m currently studying: CompTia A+, Network +, and Security +, in hopes of changing careers from elementary education to the IT industry. Thanks for all the great information! Jalapeños!😊
@jonathanojesebholo5792Ай бұрын
Hello, my name is Jonathan from Nigeria. This is my last class with Alex on SQL, I watch all his videos so I’m happy to be here.
@J3r_B3ar6 ай бұрын
This is, by far, the greatest Content Creator I've ever found. I'm not exactly a techie, but to avoid ending up on a soup line, I've been learning marketable skills. It's not so common for an individual to be both well-versed in dense techie topics & able to explain it in a brief, understandable, and practical way, but damn, Alex the Analyst... *Thank you*. (No, I wasn't given anything to write this, but am compelled to do so after viewing ATA's content versus those of others, which can be laughably unclear).
@oluwayemisiawofuye9456 Жыл бұрын
Hi! So happy to be joining. Yemi from Nigeria. I decided to make a 360 degree shift from a completely different field to tech so I get to know more and grow in the data analytics. Hoping to have a substantial amount of knowledge of SQL as a beginner.
@MinChibuikeOkoli Жыл бұрын
Hi Yemi can we connect I'm also starting a data analysis career....so we could learn together...
@oluwayemisiawofuye9456 Жыл бұрын
@@MinChibuikeOkoli Sure, it would be a pleasure.
@cynthiaokechukwu4829 Жыл бұрын
Hi Femi, i just came across this video today and going through the comments i saw yours and chibuike’s. I wouldnt mind going the team as i making shift too from a totally different career. Hope you dont mind?
@oluwayemisiawofuye9456 Жыл бұрын
@@cynthiaokechukwu4829 Hi Cynthia, that would be a great idea. How do we go about connecting? Awaiting Chibuike's reply also.
@oluwayemisiawofuye9456 Жыл бұрын
@@MinChibuikeOkoli Hello Chibuike, how do we connect?
@MoonFrogg Жыл бұрын
21:55 was such a helpful explanation to better understand what a join does when connecting IDs! love the video! and 53:30 is also super important and good to know for understanding employer expectations!
@mfk143 Жыл бұрын
Easy as you like it..sleek yet most effective...even slides are designed and curated in a way that explain almost everything related to the topic at first glance...you are the champ bro...
@BHS_Africa_Pod Жыл бұрын
Thank yu so much for having this up. I love data and facts, it makes the world go round.
@alexhigginbotham8635 Жыл бұрын
I wish I could spend some time with this guy. I would put myself at probably an intermediate skill level with SQL which is one of my main functions in my job... but I have a lot to learn.
@lavatr8322 Жыл бұрын
HOLY SHIET! This is PHENOMENAAL
@abideenabisola790811 ай бұрын
Even if i have any difficulty understanding what our tutor says, I'm always running to Alex videos, funny enough, he recommended his video for us some days ago😊
@nmcharis Жыл бұрын
This was so informative, thank you CarreerFoundry and Alex!
@BadThetan8 ай бұрын
I am from Louisville Kentucky and I am taking SQL as part of my computer engineering degree
@tnntts10 ай бұрын
from Myanmar, Thank you very much for the channel!!!
@the_reads Жыл бұрын
Thanks for this all inspiring content. I’m watching from Sierra Leone 🇸🇱.
@AlexTheAnalyst Жыл бұрын
Thanks for watching!
@Watema238 ай бұрын
Alex, you are doing a great work. For me, I am kind refresh what I learnt from ATLytiCS boot camp .
@msnadavayah10 ай бұрын
I am in the middle of the Data Analysis course with Coursera. This video has been a great way for me to further review the SQL portion of the course. Thanks for uploading.
@roxi.onmyjourney Жыл бұрын
New subscriber and this is my first video. Great content.
@nadrest Жыл бұрын
Hello, I'm from Indonesia. Thank you Alex for making this tutorial. That is very good and easy to understand, this really helped me. 😊
@linksdeath9 ай бұрын
Man this is amazing and compared to some of the things i did in c++ i can confidently do this! thank you for the reassurance!!!
@Triumphant_Christians Жыл бұрын
I just watched the replay of this live session, all i can say is thank you Alex.
@vietndk543710 ай бұрын
thank you for the video
@gloriabukachi1 Жыл бұрын
Thank you for this good information. for Alex 👏
@user-kd7oz4sx2r Жыл бұрын
Dear Alex, thanks for the insight
@adeshmishra1671 Жыл бұрын
Thanks for this wonderful tutorial ❤
@toluwalaseoluwadara6711 Жыл бұрын
Hello Alex, I am joining from Lagos,Nigeria.
@deborahchepkoech8120 Жыл бұрын
This is resourceful. Thank you TEAM
@zakhelembhele704610 ай бұрын
I honestly don't why the sudden fascination with data analytics. All I know is, it's getting crazier by the day. But with Alex I'm getting better and better!
@arpsri967511 ай бұрын
Nothing can compete Microsoft Excel. It may look not fancy, but superb functionality
@jacobbolmoses85413 ай бұрын
Learning in South Sudan 🇸🇸
@tasoscat4295 Жыл бұрын
Tasos from Australia
@marylynkaka57334 ай бұрын
Thank you Alex!
@hazzard919010 ай бұрын
Didnt know Frodo Baggins was born in 2001. Also, Thanks for the amazing content Alex !
@TamilTop57 ай бұрын
Thanks for the content its a good starter for beginners
@arifuzzamansumon6865 Жыл бұрын
Thanks Alex.
@user-kv6fu1xs4v Жыл бұрын
*Dwight Shrute - Assistant to the Lead Baker* pure gold.
@forty3139 ай бұрын
good work alex work on SQL
@kbb1499 ай бұрын
Super awesome. Thank you.
@blse20006 ай бұрын
Amazing. Thank you
@mzkhan1576 Жыл бұрын
thank you, Alex , for clearing most of my questions before jumping into the job market. Really enjoyed the whole video. Keep it Up.
@Foodiehubnaija9 ай бұрын
Great job ❤❤❤ thank you
@randyriegel85533 ай бұрын
I started programming around 12 years old. I've been a software engineer for 20 years (C# and SQL mainly). In college I had to take Calculus and Statistics to get my CS degree. Waste of time! I've worked and major Banks and Insurance companies. I don't think I've did much above basic algebra. As long as you know the logic the computer will do it for you.
@bhaskarsharma7815 Жыл бұрын
Why no time stamps ? Please update if possible
@user-hp8ol1qg1h9 ай бұрын
thank you for your job!
@nicholasnjoku4778 Жыл бұрын
My name Njoku Samuel joining from Nigeria. I am intersented in data analytics
@otienooliver9557 Жыл бұрын
Oliver from Kenya
@spotthespots77315 ай бұрын
Looking forward to learn SQL
@engr.naeemshahzad8795 Жыл бұрын
I am joining from Pakistan
@mayank13342 ай бұрын
Great presentation! Is there a link to the slides?
@daltonbay6295 Жыл бұрын
Please can I get the sheet to practice as I watch the video
@alro777910 ай бұрын
13:23 What was the purpose of the 'AS salary' statement here? I don't quite understand the meaning of 'naming' an output as it is being used here, since 'AVG(salary)' could do the job, maybe? Awesome work you're doing here, Alex! Thanks!
@MapleSyrup4739 ай бұрын
You don’t have to include the “AS salary”, but it’s good practice to explicitly define the column name when you use a function with “group by”. If you remove “AS salary” from the query it will still give you the same output, BUT the second column wouldn’t have a name (in SQL Server it would display “No Column Name” for the second column). Just a side note: In his example, it would’ve improved readability if he used “AS avg_salary” instead.
@alro77799 ай бұрын
@@MapleSyrup473 Thanks!
@H.s.c-110 ай бұрын
thanks
@bijaypatel-et4kr10 ай бұрын
That's all. I think its more than that.
@alexandre_lopes Жыл бұрын
Hello Alex, the content is amazing. Congratulations! 31:13 Could you please recommend some tools to help me to identify the bottlenecks to optimize my queries? Thank you so much
@taisiyakaripidis9828 Жыл бұрын
Thanks for the video Alex! Where can I download the dataset to follow the steps? Did I miss this part?
@TheBid11 ай бұрын
Interesting
@mugomuiruri231310 ай бұрын
good.from africa
@OnlineUser-hv5ys9 ай бұрын
Love from Pakistan 🙂🙂
@morela9488 ай бұрын
I really appreciate this video but it has a title that’s not quite right. The only thing that is advanced is window function and there is a very short mention about it.
@Cutiequeen3813 ай бұрын
I really I am Alex videos fun.
@jacklion1099 ай бұрын
Once we got to join and sbqueries I was sweating. When we got to window functions, I started crying T-T
@abdullahadekunlerasheed513211 ай бұрын
Please can I run all these code on PopSQL
@maryankorr3319 Жыл бұрын
will this be only available for a period of time or can i watch the rest another time?
@ogunniranbenjamen5289 Жыл бұрын
❤
@riyazahamed3608Ай бұрын
Is this enough for a fresher to enter data analyst field
@Aloevera_fh8 ай бұрын
I really wanted to complete the course. But I use Mac M2. I think I am not having proper guideline about how to setup. I tried through docker and terminal command. It was going okay until my azure studio is not able to find my localhost and could not get connected. I wish I could get a solution of the pretty unknown problem.. :(
@parulsharma525911 ай бұрын
from where can i get this data set
@azeezwahab51888 ай бұрын
I am Azeez Wahab Oloyede from Nigeria. Want to be a data analyst.
@mugomuiruri231310 ай бұрын
what of statistics?
@yasminibrahim97089 ай бұрын
Is this video enough for data analyst ???!
@abrilgonzalez78929 ай бұрын
is he using SQL Server Managment Studio?
@tonyclinton7588 Жыл бұрын
🇳🇬
@introvertwhiz-ll2ip3 ай бұрын
This SQL video is a waste of time. If any beginner like me in sql has came here to learn sql then please find something else.
@krneki69549 ай бұрын
part about windows functions is just bad. better skip it
@zachjones2374 Жыл бұрын
Why are there no fucking captions!!!! 😭
@RemotePossibilities1 Жыл бұрын
Now, there are closed captions and a transcript. Maybe they just hadn't had time to generate at the time you watched?
@Helloimtheshiieet11 ай бұрын
Terrible examples, never ever ever ever use subqueries in WHERE clause
@biscuit5876 Жыл бұрын
could you do something like this for python too? I'm struggling so much with python...