Here’s what is happening: base query executed first, taking whatever it needs to compute the result R0. Second recursive

Tim Ferriss, who interviewed Patrick, says that the entrepreneur is probably the most aggressive reader he’d ever met — and that means a lot coming from a guy who’s interviewed hundreds of top performers. Derek Anderson, the founder of Startup Grind, has publicly called Collison a genius.

However, genius alone didn’t get Patrick to where he is today. The Collisons were born in a small Irish town, and their humble, problem-solving, product-first approach is what turned them into a massive success.

Banks. Credit card companies. Regulators. Yes, the payments industry has a lot of police officers. And you need to get approval from all of them before the dollars falling into your bank account are considered legal.

Query (SELECT 1 AS n) now have a name — R. We refer to that name in SELECT n 1 FROM R. Here R is a single row, single column table containing number 1. The result of the whole expression is number 2.

Stripe changed all that by giving developers a quick and reliable way to set up payments. As a result, they built an army of champions for their product, effectively bypassing the “decision makers,” most of whom would have never believed that 7 lines of code can replace custom integrations that took up to 6 months to build.

Stripe changed all that. Collison brothers spent 2 years testing their platform and building relationships with credit card companies, banks and regulatory institutions. John and Patrick spent countless hours presenting their product to authorities and building enough trust to partner with them. As a result, users only have to upload a couple of documents to set up their fully operational Stripe account.

“For years, the explosive growth of e-commerce has outpaced the underlying technology; companies wanting to set up shop have had to go to a bank, a payment processor, and “gateways” that handle connections between the two. This takes weeks, lots of people, and fee after fee.” — Ashlee Vance, Bloomberg Businessweek

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d having a mobile-first approach are concepts that have been heralded for years, but until now it’s primarily been a responsibility for developers. Designers have just had to create layouts on a canvas, making multiple versions to try and cover the most popular devices, and then let developers interpret and implement those layouts.

“They have the advantage of coming to California without being tainted and polluted by what’s in the water supply and air of Silicon Valley,” says Moritz, a partner at Sequoia Capital and a Stripe board member. “They’re more humble and well-rounded.”

Important to note that base query doesn’t involve R, but recursive query references R. From the first look it seems like infinite loop, to compute R we need compute R. But here is a catch. R actually don’t reference itself, it just references previous result and when previous result is empty table, recursion stops. Actually it could help to thing of it as an iteration rather then recursion!

Another reason why Stripe blew up is because it was so universal. Platforms like Shopify and Lyft rely on payment simplicity — each additional step in account verification can mean millions of churned users. Stripe’s 7 lines of core code worked just as well in any environment, enabling billions of emerging platform users with same-week verification.

“They have the advantage of coming to California without being tainted and polluted by what’s in the water supply and air of Silicon Valley,” says Moritz, a partner at Sequoia Capital and a Stripe board member. “They’re more humble and well-rounded.”

Recursion in SQL? But why? Oh, there are many uses for that. It’s common to store hierarchical data in SQL and recursive queries are a convenient way to extract information from such graphs. Organizational structure, application menu structure, a set of tasks with sub-tasks in the project, links between web pages, breakdown of an equipment module into parts and sub-parts are examples of the hierarchical data. The post will not go into great details of those many use cases rather look at two toy examples to understand the concept - the simplest possible case of recursion on numbers and querying data from the family tree.

There’s no going around the fact that the Collison brothers are aggressively smart. Patrick quit high school a year early to join MIT at the age of 16, only to drop out a year later to raise cash for his first startup, Shuppa. He soon sold the startup to Auctomatic for $5 million.

Recursion is achieved by WITH statement, in SQL jargon called Common Table Expression (CTE). It allows to name the result and reference it within other queries sometime later.