ترکیب دیتافریم ها با یکدیگر (بخش دوم) فرض کنید داده های مربوط به کاربران شامل نام و میزان کمیسیون فروش آنها را در یک جدول به نام users ذخیره کرده ایم. در جدول دیگری به نام sales میزان فروش کاربران را ذخیره کرده ایم. با استفاده از تابع join و مشخص کردن شیوه ترکیب توسط پارامتر how می توانید ادغام را انجام دهید.
ترکیب دیتافریم ها با یکدیگر (بخش دوم) فرض کنید داده های مربوط به کاربران شامل نام و میزان کمیسیون فروش آنها را در یک جدول به نام users ذخیره کرده ایم. در جدول دیگری به نام sales میزان فروش کاربران را ذخیره کرده ایم. با استفاده از تابع join و مشخص کردن شیوه ترکیب توسط پارامتر how می توانید ادغام را انجام دهید.
Secret Chats are one of the service’s additional security features; it allows messages to be sent with client-to-client encryption. This setup means that, unlike regular messages, these secret messages can only be accessed from the device’s that initiated and accepted the chat. Additionally, Telegram notes that secret chats leave no trace on the company’s services and offer a self-destruct timer.
How Does Bitcoin Work?
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.”
