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JOINs are Cartesian products with a filter. Here’s a good explanation: https://blog.jooq.org/2016/07/05/say-no-to-venn-diagrams-when-explaining-joins/ … 2/2pic.twitter.com/IGrjjjFm3o
I saw HN arguing about this post the other day. Apparently lots of people find the Venn approach really useful as a mnemonic even though it doesn't really capture what's going on. I was surprised - I found it actively confusing and unhelpful when learning. https://news.ycombinator.com/item?id=18890893 …
Interesting - I also found the Venn approach actively confusing. I guess it may depend whether you need/want to know how something works rather than what works…
I am thinking about writing about this in more detail if ever I get around to blogging 
Interesting thread, I just read some of it. They are arguing about whether or not the diagrams are helpful. To me the difference between the two approaches isn’t about what helps so much as what one (as a SQL user) wants to know, and why. >
I think many people would rather just know enough to mostly make something work, I may be anomalous in wanting to know how things work in languages I’m using.
I did like this animated explanation that was posted somewhere in that HN argument:https://www.zmwolski.com/sql-joins-explained-visually …
I will check that animation out later.
Currently in an Apple Store, took my phone in for a new battery and it came back with the home button not working
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