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Bryson
@BrysonWalter24
https://t.co/N89WfNUrvr
New South Wales, Australia Katılım Ocak 2017
477 Takip Edilen39 Takipçiler
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SQL has levels to it:
- level 1
SELECT, FROM, WHERE, GROUP BY, HAVING, LIMIT
Master these basic keywords and you’ll be well on your way to mastering SQL.
- level 2
Mastering JOINs:
Most common JOINs: INNER and LEFT
Less common JOINs: FULL OUTER
Joins you should avoid almost always: RIGHT and CROSS JOIN
Mastering common table expressions (CTEs).
The WITH keyword defines a CTE which you can imagine as a “variable” that you can query later.
Using variables like this you can master algorithm techniques like recursion, breadth first search and more!
CTEs also make your SQL much more readable and make your coworkers hate you less compared to nested sub queries.
- level 3
Mastering window functions
Window functions have 3 pieces:
The function (i.e. SUM, RANK, AVG)
The over clause to start the window
The window definition which has 3 pieces:
- how to split the window up with PARTITION BY
- how to order the window with ORDER BY
- how to restrict the window size with ROWS clause (useful for rolling monthly averages)
Understand RANK vs DENSE_RANK vs ROW_NUMBER, I have been asked this in interviews a million times.
- level 4
You understand table scans, b-tree indexes, and partitioning schemes to increase performance.
Doing something like COUNT(CASE WHEN) is much better than doing multiple queries with a UNION ALL. UNION ALL is terrible for all sorts of reasons that I don’t want to get into in this post.
B-trees indexes allow for efficient scanning of data in the WHERE clause.
Use explain plans to understand if an index is actually being used or not!
Partitioning is similar to indexes except it’s a “poor mans” index. It just keeps data in specific folders and skips the folders that don’t include the data I question.
What else did I miss for mastering SQL?
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@MuskratPiss
Here’s an explanation of the actual market wide criminal conspiracy that GameStop exposed
and how and why short sellers could actually blow up the entire global economy.
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@noahkagan By far the recent one with @tferriss and @JonBatiste
One of a kind.
x.com/thedanielaros/…
Daniel Aros@thedanielaros
Tim Ferriss' podcast with Jon Baiste is one of my latest listens and one of the best I’ve heard in 2024. It’s about getting unstuck and living a life of purpose and originality. Here are my favorite Notes and Takeaways:
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I gave you $PNUT before it did 1384x
I gave you #MOODENG before it did 1238x
I gave you $POPCAT before it did 417x
I gave you $ACT before it did 29x
I gave you $WIF before it did 90x
I gave you $BRETT before it did 730x
I gave you $MYRO before it did 29x
DMs been going WILD asking for the next 100x.
Alright, I’ve got it. The next 100x runner.
So early, so low MC, I can’t even post it here.
But I’ll share it with a few who actually want it.
RT. Like. Drop a comment.
Make sure you’re following me + keeping DMs open

Rekt Fencer@rektfencer
1384x since my $PNUT call and people STILL saying "100x-1000x plays are impossible" LMAO I’ve done it over 10 times already - $WIF, #MOODENG, $BRETT... and I gave them ALL to you And I’m not done yet. This year? Even more plays coming your way you got 2 choices now: 1) follow me, turn on notifs, and PRINT generational wealth 2) ignore this, and let the next guy take your seat at the table the choice is yours
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@BRICSinfo This is taken out of context.. provide the full interview 🙄
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I just published Stock Investing: A Comprehensive Guide to the Australian Market 2024 link.medium.com/JtNsnrqDhNb
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