Properties of a Candidate Key All candidate keys have some common properties. One of the properties is that for the lifetime of the candidate key, the attribute used for identification must remain the same. Another is that the value cannot be null. Lastly, the candidate key must be unique. For example, to specifically and uniquely identify each employee, a company might use the employee’s Social Security number. Some people share the same first names, last names, and position, but no two people use the same Social Security number....

Researchers recently took a significant step toward a future quantum version of the Internet by connecting three quantum devices in a network. A quantum internet might enable very secure communications, but experts say it won’t be unhackable. “The quantum internet allows users to transmit information more securely than ever,” Marijus Briedis, CTO at the cybersecurity firm NordVPN, told Lifewire in an email interview. “While the data encrypted using quantum key distribution will be transmitted more securely and would be harder for a bad actor to intercept, we cannot say for sure that there will be no weak points....

The Acer XFA240 offers some of the higher specs you’d typically see in a more expensive monitor, yet its price is relatively affordable. I tested the XFA240 for 40 hours, examining its design, setup process, picture quality, and sound quality to see how it stacks up against other budget gaming monitors on the market. Design: Function over form The 24-inch XFA240 doesn’t have that ultra-sleek look you get with a lot of the best high-end gaming monitors—the bezel measures about one-half inch in thickness, and it isn’t flush with the screen....

Canon’s new iOS app called Photo Culling shows you which of your photos are the best, based on its AI algorithm. The app is the perfect solution for cleaning up the duplicates of photos on your phone, and experts say this kind of application is exactly how AI can help us with tedious tasks. “The announcement of the new AI app, Photo Culling by Canon, is another step into the future and gives a teaser of what the future of AI is capable of,” wrote Atta Ur Rehman, content manager at Gun Made, to Lifewire in an email....

Whether due to feedback or the realization that it’s been prioritizing hosts, Airbnb has decided it’s time to throw renters a proverbial bone by way of (slightly) more financially friendly search options. CEO Brian Chesky revealed the company’s plans on Twitter today, stating, “I’ve heard you loud and clear—you feel like prices aren’t transparent, and checkout tasks are a pain.” Probably the most important upcoming change will be an option for you to view a property’s subtotal (i....

Are You Discoverable in AirDrop? AirDrop has a few settings that control if others can see your iOS or Mac device. These settings can block devices from appearing, or only allow some individuals to be able to see you. AirDrop uses three discovery settings: Off: Your device is not seen by anyone on your local network.Contacts Only: Only those people who are present in your Contacts app will be able to see your device in their AirDrop network....

Conversation Boost for AirPods Pro was given a brief mention back in June during Apple’s WWDC 2021, but now you can test it out for yourself for the full effect. This new feature is meant to make conversations easier for people with mild hearing impairments to follow. Conversation Boost utilizes the beaming microphones used in AirPods Pro along with computational audio to focus on and enhance the person speaking in front of you....

The AKASO EK7000 Pro 4K Action Camera promises to deliver a stripped down version of the most expensive action cameras without sacrificing quality video and photos. At less than half the price of the budget GoPro, could it compete with the big name brand? We ran the EK7000 Pro through the paces to find out. Design: Looks like a GoPro clone The AKASO EK7000 Pro 4K Action Camera looks just like you’d expect an action camera to look....

Here’s a breakdown of the differences between the two devices to help you decide between the Echo Show vs. the Lenovo Smart Display. Overall Findings The Lenovo Smart Display has many built-in features that the Echo Show lacks. For example, it works with Google Home, Chromecast devices, and Roku devices through Google Assistant. The Lenovo Smart Display also works with the smart home devices that Google Home supports. Product Design: It Depends on Your Tastes The newer Echo Show models have an improved design over the original....

Desktop publishing is a term coined after the development of a specific type of software. It’s about using that software to combine and rearrange text and images and creating digital files for print, online viewing, or websites. Before the invention of desktop publishing software, the tasks involved in desktop publishing were done manually by people who specialized in graphic design, typesetting, and prepress tasks. Things You Can Do With Desktop Publishing With desktop publishing software and hardware you can:...

Apple has revealed that the new Apple TV 4K will allow users to enable HDMI ARC and eARC, which will let audio from all input sources stream over HomePod Speakers. According to 9To5Mac, Apple originally enabled the ability for older versions of Apple TV to stream audio to HomePod Speakers last fall. That software update only allowed audio from Apple TV, itself, to be shared. The Apple TV 4K will allow all audio from all of your TV inputs to be played through your HomePod, if your TV supports ARC output....

Another year is almost over, making it prime time to reflect on the last 334 to 365 days with Apple Music’s updated Replay features. Apple Music subscribers can now look up their listening stats for the year, share details with friends and family, or take a gander at the newly-revealed Top Charts. This year’s redesigned Replay has expanded its listening insights to give you a more nuanced and thorough breakdown of your top songs, artists, genres, etc....

The latest iPhones will bring even more advancements to the cameras and processing power of Apple’s smartphone lineup. The company showcased three new models during Tuesday’s Apple event, including the base iPhone 13, the iPhone 13 Pro, and the iPhone 13 Pro Max. The team only briefly mentioned the fourth model, the iPhone 13 mini. The iPhone 13 will include a 20% smaller notch, compared to the iPhone 12, and also comes with an upgraded A15 chip to power its new advancements....

iOS 15.2 brings the App Privacy Report, an interactive list of every internet connection made by every app on your device. And there’s more. It also tells you which apps have accessed your private data—photos, contacts, and even the microphone and camera. It’s browsable, easy to understand, and utterly terrifying for less scrupulous developers. “Developers will likely hope that iPhone users will forget to turn on the App Privacy Report in Settings....

Are In-Wall Speakers the Right Choice for You? In-wall and in-ceiling speakers aren’t a simple solution. Installing them means cutting holes in the walls or ceiling, requiring either a homeowner skilled at DIY projects or the services of a custom installer. There’s also the complication of running wires through walls and, usually, a lot of drywall dust. Plus, you can’t cut holes in the walls unless you own the home. Lastly, many audio enthusiasts feel—rightly or wrongly—that in-wall and in-ceiling speakers aren’t capable of high-quality sound....

BMP files can store both monochrome and color image data in various color/bit depths. Although most BMPs are uncompressed and so are fairly large, they can optionally become smaller through lossless data compression. This format is very common, so common in fact that many seemingly proprietary image formats are actually just renamed BMP files! XBM and its newer XPM format are two image formats that are similar to DIB/BMP....

Should you buy an extended warranty for your camera? This is a tough question to answer, and personal preference will play a large role in determining what you ultimately do. So to help you decide whether you should buy an extended warranty for your camera, just continue reading the tips and advice below. What Is an Extended Warranty? An extended warranty adds additional time, usually a few years, to the coverage for your digital camera....

However, although you can play a DVD in a Blu-ray Disc player, you can’t play a Blu-ray Disc in a DVD player. Anyone that claims otherwise is misleading the consumer. Why DVD Players Can’t Play Blu-ray Discs The reason that you can’t play a Blu-ray Disc on a DVD player is that the discs are embedded with more video and audio information than a DVD player is designed to read....

Chromebooks and Laptops Just about every major laptop manufacturer has released its own version of the Chromebook. Their low price tag and the growing number of features they support make Chromebooks an attractive option, but they do not support many of the programs available for Windows and macOS. If you use special software for school or work, it probably won’t be compatible with a Chromebook. If you primarily work with web-based tools, then a Chromebook could be adequate....

Why Did Gmail Mark Conversation as Important? Google uses complex algorithms to ascertain the importance of an email and makes the reasons easy to see. To get an idea of why Gmail determined an email was important enough to make your Priority Inbox: Potential Reasons for Categorizing an Email as Important The reasons Gmail places messages in your Priority Inbox include: The words in the message. You may have marked similar emails important in the past, or the message urges you to action....