#数据库
在中国做数据库的，多少都听过 萨师煊 教授的名字，他撰写的《数据库系统概论》第一版于1983年出版，是中国大陆第一本讲解数据库系统实现的专著，人民大学在数据库领域也是内地最强的几所高校之一。
今天看到《萨师煊教授：国产数据库学科的拓荒人与奠基者》一文中提及他的家世，才知道这么显赫：
* 萨氏源于山西雁门萨氏先祖，已有六七百年的历史，祖先是蒙古色目人。
* 最早的先祖是元代四大诗人之一的萨都剌，曾官至南台侍御史，钦赐萨姓，此为萨氏家族立姓之始。
* 萨都剌的孙子萨仲礼是元统年间（1333年）的进士，官至福建行中书省检校，举家由晋迁闽，子孙繁衍渐成望族。
* 后人中包括：爱国海军将领 萨镇冰、中山舰长 萨师俊，物理学家 萨本栋、化学家 萨本铁、微电子学家 萨支唐、数学家 萨支汉等等。
BY codedump的电报频道
From the Files app, scroll down to Internal storage, and tap on WhatsApp. Once you’re there, go to Media and then WhatsApp Stickers. Don’t be surprised if you find a large number of files in that folder—it holds your personal collection of stickers and every one you’ve ever received. Even the bad ones.Tap the three dots in the top right corner of your screen to Select all. If you want to trim the fat and grab only the best of the best, this is the perfect time to do so: choose the ones you want to export by long-pressing one file to activate selection mode, and then tapping on the rest. Once you’re done, hit the Share button (that “less than”-like symbol at the top of your screen). If you have a big collection—more than 500 stickers, for example—it’s possible that nothing will happen when you tap the Share button. Be patient—your phone’s just struggling with a heavy load.On the menu that pops from the bottom of the screen, choose Telegram, and then select the chat named Saved messages. This is a chat only you can see, and it will serve as your sticker bank. Unlike WhatsApp, Telegram doesn’t store your favorite stickers in a quick-access reservoir right beside the typing field, but you’ll be able to snatch them out of your Saved messages chat and forward them to any of your Telegram contacts. This also means you won’t have a quick way to save incoming stickers like you did on WhatsApp, so you’ll have to forward them from one chat to the other.
Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”
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