Database Professionals

When learning statistics, one of the most fundamental yet usually grossed over concepts is that of **variance** (i.e. the square of the standard deviation in normal distribution). As we know, virtually all statistical operations which measure deviations of individual values from the norm involve adding the **SQUARED differences between the two numbers**. However, very few instructors could explain why we have to use squares rather than just the absolute values of the difference (or other even powers such as 4, if the intention is to avoid the negatives). This tutorial shall cover this in a convincing manner. Secondly, while we all know the variance of a SAMPLE is arrived by dividing (n-1) of the sum of squared differences, where n is the number of observations, few can articulate the rationale behind it. This tutorial shall also prove step by step why this is case, so after this you could appreciate the logic behind this ingenious insight instead of just reciting it like a medieval myth.

恆常玩pickleball活動，不定期開場，target每場6-8人攤分場錢，人均低至$50/2hrs，包球拍租借，有興趣入嚟先😁 報名方法: **如果你想更深入了解其他會員/優先獲得活動名額及資訊，歡迎填妥[簡單表格](https://forms.gle/VuduPPGrMwCFiY2S9)加入Whatsapp會員限定群組，連結：** https://forms.gle/VuduPPGrMwCFiY2S9 本群（Fun & Positive Hong Kong X L&G）旨在協助大家輕鬆快樂交友，排憂解難，擴闊社交圈子，成為大家繁忙生活中嘅一片可以抖下氣嘅綠洲😉大家等緊你呀！～🤗🥳😉👍 **Your Pal,** **Fun & Positive Hong Kong X L&G Admin Team🥳😎**

🎉 Sunday Fusion Dance Party 🥳 Get ready for a night of fusion-style dance and an inclusive vibe where everyone can lose themselves in the rhythm 😎😜 📍 Santa Monica Studio 9 Shelley Street, Central ✨ Pre-Party Class: 7:15 PM – 8:00 PM (Perfect for beginners!) 💃 Party: 8:00 PM – 11:00 PM 🎟️ Fee: HKD 100 (includes one standard drink 🍷) Come dance, connect, and celebrate the fusion energy with us! See you soon! 💫

大家好, 我們誠摯地邀請大家來參加我們的聚會。請大家各自帶一本最近閱讀的書 (中英文也可以, 我們建議文學)，分享您對這本書的想法和感受。這將是一個輕鬆愉快的環境，讓我們一起交流和啟發。 費用: 免費 聚會地址是：上環文咸西街44-46號903室 Whatsapp booking: 4449 0049 Website: https://midnightbliss-studio.com/ IG: midnight_bliss_studio 期待與大家見面。 祝好, Cultural Hub We sincerely invite you to our book club. Please bring a book you've recently read (in Chinese or English, it's fine but we prefer literature), and share your thoughts and feelings about it. This will be a relaxed and enjoyable environment for us to exchange ideas and inspire each other. Fee: Free RSVP Whatsapp booking: 4449 0049 Location: Suite 903, 44-46 Bonham Strand West, Sheung Wan

Sports Chanbara Regular Class (Sunday) Sports chanbara is a free-style Japanese combat sport, which originated from Kodachi Goshindo (Self-defense with a short sword). We would like to introduce this new sport to Hong Kong. Please join us and be a Samurai. Dress code: Sport Attire The session will include the following: Warm-up exercise Basic Japanese Dojo manners Sports Chanbara Basic movement (Kihon Dosa) Attaching Techniques Blocking Techniques Basic Movements of Dodging Sparring Date: Each Sunday Time: 2000-2200pm Location: 6/F, Activity Room, Tai Kok Tsui Sport Centre Fee: $600 per 4 classes Others: Attendee no need to bring/buy any helmet or gear and coach will borrow the gears for attendee use during class. For reservation, please message/call Stephen Sensei at 61762261 https://wa.me/85261762261 To find out more, please visit our Facebook Page: https://www.facebook.com/HongKongSportsChanbara Instagram Page: https://www.instagram.com/sports_chanbara_hong_kong/

🛎️ 全新活動: Gen Z Board Game聚會 (1995年或以後出生的朋友仔聚埋一齊玩下board game識下朋友仔!) 🛎️ 地址: 觀塘成業街 16 號怡生工業中心 A 座 2 樓 A2 室 🏢 好多時會有客人問我哋我哋嘅Meetup Party Games活動會玩啲乜嘢？其實就係例如9 Upper, 狼人真言，Flip 7，歌迷序會等等好玩流行嘅輕鬆桌遊，由當日嘅活動主持決定最終玩邊幾隻！ 其實玩邊隻game唔係重點。重點係個活動好唔好玩！我哋好多活動都有好多人參加. 所以不必多說，你應該知道究竟發生了什麼事！ \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* **今日活動資訊:** 費用: [$105 / Girls $85] Pay at entrance. 包飲品一盒, extra飲品每盒$5. 🔔 人多, 或員工/主持忙於教玩遊戲時可能沒暇收取場費, 請利用櫃面PayMe code/Ali Pay /FPS號碼自行支付. 如發現有故意走數情況, 會被放進Meeple Tree 黑名單. 🔔 必須在此報名. 🔔 場地沒有食物提供, 但歡迎帶外賣上來食. 🔔 宣傳其他場地/放飛機/遊戲過程中態度惡劣者會被放進黑名單. 🔔 入埸請除鞋. 埸內拖鞋祗供店內用, 請勿著出店外. 🔔 報名參加Meetup活動, 當系統問你"Are you bringing anyone"時, 如果你祗是一個人來, 毋須㩒+1 (+1代表會帶朋友來的意思). 🔔 我哋嘅活動主持人有時會因為工作或者學業關係臨時嚟唔到，Meeple Tree 保留臨時更換主持嘅可能性。🙏 🔔 本會因放飛機(活動開始前24小時內退出者)被移除人數: 103 🔔 Meeple Tree保留參加者名單最後決定權. 🔔 Follow我哋IG: mtboardgame / boardgame_hk

Come learn how to dance in a sexy feminine way with our most professional and popular dance choreographer JM Justin Vergara! WhatsApp 63344266 to book Prepayment required to secure booking www.deedreamlife.com/pricing-packages for fee info Download Dee Dream Life App for more info

Fee 14ppl $75 4-6pm court 2,3 請大家遵守以 1:請大家不要在遊戲其間進行羽毛球技術指導. 2:男與女閒聊時請保持一隻手距離. 3:遊戲已例明 羽毛球等級(ab,li,i 等等), 請按照自己所屬等級參與遊戲. 4:各下參加左的活動有指定場號, 如果自行走向其他埸由我們舉辦的活動的埸地打波, 我地可能會給予警告, 請不要挑戰我們的忍耐力。 5:如果少於48小時內取消出值, 都請交出值應付之金額。 如有違反, 一律blacklist. If you join my game for first time please send me your mobile no. to confirm your spot. Tel: 97843661 Coming Please Whatsapp or message me through meetup as soon as possible if you can't come. ‧ We will be playing 21 points doubles match ‧ Strictly NO BEGINNER ‧ The event is not first come first serve, I will pick suitable players in order to balance the level of the game. So if you are not on the attending list, please don't feel being offended, thanks for understanding ‧ Cancellation policy: Cancellation deadline is 48 hours prior to the start time of the game. Cancellation past the deadline will be marked as no-show.11

✨️🏸Happy Singles Doubles (Men's and Women's)✨️ Location: Hong Kong Ball: RSL Supreme Fee: Depends on the number of participants (split equally among participants,e.g., Total $59 2 people = $30@) (Extra administrative fee: $20) Number of Participants: Max 6 (Men: Junior High or below, Women: Happy to near Elementary) a) Participants must bring their own rackets, and registration is only open to members of this group☆ b) Members who have never participated before will have priority registration, while those who have participated can be placed on the waiting list. If no one registers within 2 days of the event being posted, the waiting list will be filled according to the order of registration. Interested parties please join to our \*\* [WhatsApp Group](https://chat.whatsapp.com/FCBdnusno62F2WhuEwO2wV?mode=gi_t) 98729086 to register! The goal is to have fun playing ball; please don't be sullen or act like a coach. If you have friends who want to have dinner together, you can join after playing badminton time.

Chinese Sword Dance - Beginners 中式劍舞 (初班) 🗡️ Discover the Art of Chinese Sword Dance ! 🩰 Beginner’s Class – No Experience Needed Thu 8-9pm lai Chi Kok /Sun 6-7pm South Horizons $120/hr Step into the graceful world of Chinese Sword Dance, where tradition meets movement. In this beginner-friendly class, you’ll learn: ✨ Fundamentals of Chinese Sword techniques in a dance-inspired style ✨ Basic Chinese dance movements to enhance coordination and flow ✨ Strength and flexibility training for arms, wrists, and fingers ✨ Footwork that tones and strengthens your legs ✨ A full-body workout that blends elegance with power The sword adds gentle resistance, turning each movement into a dynamic fitness experience. Whether you're exploring a new cultural art form or seeking a graceful way to stay active, this class is for you! Enquiry 查詢/ Class Booking 預約: lssdance2012@gmail.com WhatsApp : 65230389 Regular students no need to register here.

Fee: 7people $75/per 7-9pm Court#1 請大家遵守以 1:請大家不要在遊戲其間進行羽毛球技術指導. 2:男與女閒聊時請保持一隻手距離. 3:遊戲已例明 羽毛球等級(ab,li,i 等等), 請按照自己所屬等級參與遊戲. 4:各下參加左的活動有指定場號, 如果自行走向其他埸由我們舉辦的活動的埸地打波, 我地可能會給予警告, 請不要挑戰我們的忍耐力。 5:如果少於48小時內取消出值, 都請交出值應付之金額。 如有違反, 一律blacklist. If you join my game for first time please send me your mobile no. to confirm your spot. Tel: 6019 8622 Ice Please Whatsapp or message me through meetup as soon as possible if you can't come. ‧ We will be playing 21 points doubles match ‧ Strictly NO BEGINNER ‧ The event is not first come first serve, I will pick suitable players in order to balance the level of the game. So if you are not on the attending list, please don't feel being offended, thanks for understanding ‧ Cancellation policy: Cancellation deadline is 48 hours prior to the start time of the game. Cancellation past the deadline will be marked as no-show and need to pay the no-show Fee.

The June Ohio North Database Training user group meeting will be held on **June 2nd, 2026 at 5:00PM**. This will be a **HYBRID** event and we will be joined online by **Sam Nasr.** You're welcome to come meet in-person at our meeting location, the offices of Improving at **[6000 Freedom Square Dr,](https://www.google.com/maps/place/Improving/@41.4004167,-81.6614462,17z/data=!3m2!4b1!5s0x8830e5b8255c5919:0xd8297060eb68fe04!4m6!3m5!1s0x8830dc7a0fe35dc9:0xbfc4710ecadfc5c!8m2!3d41.4004127!4d-81.6588713!16s%2Fg%2F1hm3hkqp3?entry=ttu&g_ep=EgoyMDI1MDQzMC4xIKXMDSoASAFQAw%3D%3D)** **[Unit 110,](https://www.google.com/maps/place/Improving/@41.4004167,-81.6614462,17z/data=!3m2!4b1!5s0x8830e5b8255c5919:0xd8297060eb68fe04!4m6!3m5!1s0x8830dc7a0fe35dc9:0xbfc4710ecadfc5c!8m2!3d41.4004127!4d-81.6588713!16s%2Fg%2F1hm3hkqp3?entry=ttu&g_ep=EgoyMDI1MDQzMC4xIKXMDSoASAFQAw%3D%3D)** **[Independence, OH 44131](https://www.google.com/maps/place/Improving/@41.4004167,-81.6614462,17z/data=!3m2!4b1!5s0x8830e5b8255c5919:0xd8297060eb68fe04!4m6!3m5!1s0x8830dc7a0fe35dc9:0xbfc4710ecadfc5c!8m2!3d41.4004127!4d-81.6588713!16s%2Fg%2F1hm3hkqp3?entry=ttu&g_ep=EgoyMDI1MDQzMC4xIKXMDSoASAFQAw%3D%3D)** [Teams Link ](https://teams.microsoft.com/meet/215625630917731?p=vxNb3zudhNj0S6Cg0v)if anyone needs it after RSVP-ing for in person. If you would like to subscribe to our email list outside of Meetup, we have changed platforms recently and you will need to register [here in Kit ](https://ohio-north-data-training.kit.com/b8f036f615)instead to receive emails. Agenda: **5:00 PM EST**: Online and in-person meeting begins with a social hour. This is an unstructured hour where you can join us to catch up and meet other group members before the session starts. There will be food brought in for in-person attendees. **6:00 PM EST**: Elections, announcements, followed by our feature presentation. See below for presentation details. **7:30 PM EST**: Optionally after the main presentations, the in-person crowd may go out for snacks and drinks at a local establishment. We hope to see you there! Session Abstract ### SQL Server 2025: The Developer’s Revolution Explore SQL Server 2025’s new dev features -JSON type, Regular Expressions, and Change Event Streaming for real-time pipelines. See how REST API and Data API Builder turn your data into secure, high-performance APIs. Packed with demos, this session is perfect for developers, DBAs, and architects \*Please note, that we will be using Microsoft Teams for the online portion of this meeting. You may want to join a few minutes early to ensure you do not have any issues. If you are attending in person, there are large TVs at the office, and you do not need to bring a laptop or use Teams.

Topic to be announced. **THANK YOU** *Franklin University* for hosting our meetup! To learn more about *Franklin University*, please visit their website: https://www.franklin.edu/ **DIRECTIONS** Franklin University Fisher Hall 300 E. Main St, Columbus, OH 43215 Map: https://maps.app.goo.gl/jxjBA2hUmS5qrvhq8 Parking is FREE! Please park in Lot C in front of Fisher Hall. See attached map. NOTE: Map the address only. When mapping with Google Maps it may use the Fisher Hall at OSU, which is NOT correct. **Want to sponsor the pizza and/or bar tab?** Please contact me if you would like to sponsor this meetup's pizza and/or bar tab: angelo@mandato.com

Click Here For More Videos: https://www.facebook.com/share/r/17bwkttXhV/ *********************************** Salsamante Dance Academy will be at Swerve Every Tuesday Night to share the Rhythm & Energy of Bachata & Salsa. These are Beginner Level lessons to get you comfortable and understand the two dances. Spread the Good News to all. Swerve Dance & Fitness Complex 640 Lakeview Plaza Blvd A, Worthington, OH 43085 Bachata 7pm-8pm Salsa 8pm-9pm $15 - One Lesson $20 - Both Lessons

QA or the Highway is a one-day, affordable, regional, professional conference featuring real-world experience and thought leadership in the QA and testing industry. This is a ticketed event please register here: https://www.qaorthehwy.com/ Featured Keynote Speakers: **Matthew-Hope Eland** **(Wizard at Leading EDJE)** \- An AI Specialist and Wizard at Leading EDJE who is known to teach software engineering\, AI\, and data science concepts in the most ridiculous ways possible\. Matt has used machine learning to settle debates over whether Die Hard is a Christmas movie\, reinforcement learning to drive the behavior of digital squirrels\, data analytics to suggest improvements to his favorite TV show\, and AI agents to play board games and create an AI agent with the personality of a dog\. Matt is the author of "Data Science in \.NET with Polyglot Notebooks" and "Refactoring with C\#" as well as several LinkedIn Learning courses\. Matt helps organize the Central Ohio \.NET Developer Group\, runs several blogs and a YouTube channel\, has a Master’s of Science in Data Analytics\, and is a current Microsoft MVP in AI and \.NET\. **Tatyana Arbouzova** **(CEO at Innovate QA)** \- Tatyana Arbouzova is an engineering and business leader with a strong background in Quality Engineering across multiple industries\, including Big Tech\, Healthcare\, and Entertainment\. She has held leadership roles at world\-class companies such as Microsoft\, VMware\, Disney\, and The Pokémon Company International\, where she focused on building quality\-driven cultures and scaling teams to deliver high\-impact products\. With decades of experience\, Tatyana has helped organizations transform their quality practices so teams can deliver software efficiently\, confidently\, and with measurable business outcomes\. Today\, Tatyana advises software companies on adopting AI to optimize quality practices and improve how software is delivered at scale\. She is also a passionate community builder and the founder of Innovate QA\, a thriving Seattle\-based community and conference for quality professionals\.

This is a free, in-person meeting on the subject of betrayals, losses and how to get over them so you can build lasting relationships. Burdened by a stressful relationship? Unhealthy relationships can trigger feelings of anger, despair or self-doubt. They can create dwindling spirals of fights and seeking to make-up, or trying to “pin the blame” on someone or something. If you don’t find the RIGHT reasons, or select the correct sources of the problem, the problem can just get worse and worse. Whether in love or personal ties, with friends or at work, our life really IS affected by the quality of our relationships. Good ones can promote pleasure and survival while less optimum ones can lead to annoyance, anger, self-doubt, stress, or even affect our health and ability to survive well. Whether you are suffering from a divorce, or a painful break-up, don’t know who to trust (or who to CHOOSE) as a partner, friend, boss or employee - the anxiety of relationship troubles can really make a mess of things. Maybe you’ve suffered a betrayal, or are dealing with hostility or criticalness or invalidation. Dwindling relationships can involve destructive behavior, where we hurt those we love, or start succumbing to self-destructive thoughts, attitudes or behaviors that spiral out of control and affect much more than our immediate relationship. Past losses in love or life can affect how we act or react to new people and situations and hold us back from even starting to create new, possibly great relationships! How can one get back onto a saner course of action? Come to our Meetup, where we can introduce you to some of the knowledge, tools and techniques of the breakthroughs in the field of the mind that we can apply to this ever important area of life: human relationships! Break free from self imposed limitations Here we will discuss: • How to “erase” the trauma of past hurts and betrayals so that one isn’t always repeating past mistakes. • Why and how do the negative emotions of others affect you? • Why is my partner withdrawing and what can I do about it? • Why do we sometimes feel compelled to hurt the ones we love? • Fights & arguments - what's really behind them? • What underlies “corrosive criticism” or the need to invalidate self or others? • How one can stably change one’s outlook on life so they can affect positive change? • Where do compulsive destructive behaviors come from and what can be done about them? • How to form closer bonds & keep growing the relationships with the people you care about? • How to enhance one’s own ability to survive and create positive healthy relationships whether in love, family & friendships or in work, business or one’s career? Relationships can be hard and life itself IS challenging. Why not arm yourself with the knowledge and breakthroughs that have been made about the mind, mental reactions & interpersonal relationships, so that one has better awareness and control over themselves and life in general. Learn where painful experiences are “stored” and how they can unknowingly affect us. You will also find out how one can “erase” those past painful experiences so that one is free to move forward without being tripped up by the past. Learn too, about what can lead some people to become “toxic” personalities and how to identify those traits in others so you won’t be tripped up trusting the wrong person. Our free Meet-ups occur in a safe environment where one can learn, without fear of judgment or criticism, and without the recommendation of harmful mental techniques or therapies, just how YOU can get yourself onto a happier & more successful path: in love & in life. We look forward to having you join us! This class is sponsored by the Dianetics & Scientology Life Improvement Center of Central Ohio.

Our monthly PHP meetup. A virtual shindig courtesy of Zoom. Check back here for the details around 6:15 pm

**The Behavior Gap: Where Products Win or Lose** Teams today have more data than ever, and yet many still struggle to understand why customers adopt, engage with, or abandon their products. Teams sprint, ship faster, and chase more signals… all while metrics stall and confidence drops. The missing piece isn’t more data. It’s often the behavioral insight between the metrics, explaining why the numbers move in the first place. Dashboards can tell you what customers did, but understanding why they did it (and how to influence what they do next) requires a deeper blend of insights. This session is about closing that gap. Drawing from real-world experience designing and scaling products as [ZoCo Design](https://zocodesign.com/)’s CEO, [Lacey](https://www.linkedin.com/in/laceypicazo/) will share how to cut through the noise and identify the insights that actually change behavior—moving people, and moving metrics. You’ll learn: * Why understanding customer behavior is a quant and qual challenge * How to spot the signals that actually predict behavior change * Where AI accelerates insight, and where it creates distraction * How to get meaningfully closer to customers, without adding more tools This talk reframes how to evaluate performance and identify what levers actually improve it, helping your team to make smarter bets with greater confidence. Every meaningful outcome is driven by behavior change. And when you know how to design for behavior, you stop guessing, and start building things that work. **About Our Speaker** [Lacey Picazo](https://www.linkedin.com/in/laceypicazo/) is the Founder and CEO of ZoCo, a healthcare product studio that turns complex, high-stakes ideas into products that drive real-world adoption. She partners with healthcare organizations to uncover critical care delivery insights, focus product strategy through behavior design, and build solutions that patients and providers actually use. Thanks to our 2026 sponsors: [Clarivoy](https://www.clarivoy.com), [What Box Consulting Group](https://www.whatboxconsultinggroup.com), [Conductrics](https://www.conductrics.com), and [Piwik PRO](https://piwik.pro) More info at [cbusdaw.com](https://cbusdaw.com)