Liquibase - Zarządzanie zmianami w relacyjnych bazach danychMarcinStachniuk
Prezentacja wygłoszona na Wrocławskim JUGu 30 września 2015. Prezentacja opisuje w jaki sposób można zarządzać zmianami w relacyjnych bazach danych i jak ten problem rozwiązuje Liquibase.
2024 State of Marketing Report – by HubspotMarius Sescu
https://www.hubspot.com/state-of-marketing
· Scaling relationships and proving ROI
· Social media is the place for search, sales, and service
· Authentic influencer partnerships fuel brand growth
· The strongest connections happen via call, click, chat, and camera.
· Time saved with AI leads to more creative work
· Seeking: A single source of truth
· TLDR; Get on social, try AI, and align your systems.
· More human marketing, powered by robots
ChatGPT is a revolutionary addition to the world since its introduction in 2022. A big shift in the sector of information gathering and processing happened because of this chatbot. What is the story of ChatGPT? How is the bot responding to prompts and generating contents? Swipe through these slides prepared by Expeed Software, a web development company regarding the development and technical intricacies of ChatGPT!
Product Design Trends in 2024 | Teenage EngineeringsPixeldarts
The realm of product design is a constantly changing environment where technology and style intersect. Every year introduces fresh challenges and exciting trends that mold the future of this captivating art form. In this piece, we delve into the significant trends set to influence the look and functionality of product design in the year 2024.
How Race, Age and Gender Shape Attitudes Towards Mental HealthThinkNow
Mental health has been in the news quite a bit lately. Dozens of U.S. states are currently suing Meta for contributing to the youth mental health crisis by inserting addictive features into their products, while the U.S. Surgeon General is touring the nation to bring awareness to the growing epidemic of loneliness and isolation. The country has endured periods of low national morale, such as in the 1970s when high inflation and the energy crisis worsened public sentiment following the Vietnam War. The current mood, however, feels different. Gallup recently reported that national mental health is at an all-time low, with few bright spots to lift spirits.
To better understand how Americans are feeling and their attitudes towards mental health in general, ThinkNow conducted a nationally representative quantitative survey of 1,500 respondents and found some interesting differences among ethnic, age and gender groups.
Technology
For example, 52% agree that technology and social media have a negative impact on mental health, but when broken out by race, 61% of Whites felt technology had a negative effect, and only 48% of Hispanics thought it did.
While technology has helped us keep in touch with friends and family in faraway places, it appears to have degraded our ability to connect in person. Staying connected online is a double-edged sword since the same news feed that brings us pictures of the grandkids and fluffy kittens also feeds us news about the wars in Israel and Ukraine, the dysfunction in Washington, the latest mass shooting and the climate crisis.
Hispanics may have a built-in defense against the isolation technology breeds, owing to their large, multigenerational households, strong social support systems, and tendency to use social media to stay connected with relatives abroad.
Age and Gender
When asked how individuals rate their mental health, men rate it higher than women by 11 percentage points, and Baby Boomers rank it highest at 83%, saying it’s good or excellent vs. 57% of Gen Z saying the same.
Gen Z spends the most amount of time on social media, so the notion that social media negatively affects mental health appears to be correlated. Unfortunately, Gen Z is also the generation that’s least comfortable discussing mental health concerns with healthcare professionals. Only 40% of them state they’re comfortable discussing their issues with a professional compared to 60% of Millennials and 65% of Boomers.
Race Affects Attitudes
As seen in previous research conducted by ThinkNow, Asian Americans lag other groups when it comes to awareness of mental health issues. Twenty-four percent of Asian Americans believe that having a mental health issue is a sign of weakness compared to the 16% average for all groups. Asians are also considerably less likely to be aware of mental health services in their communities (42% vs. 55%) and most likely to seek out information on social media (51% vs. 35%).
AI Trends in Creative Operations 2024 by Artwork Flow.pdfmarketingartwork
This article is all about what AI trends will emerge in the field of creative operations in 2024. All the marketers and brand builders should be aware of these trends for their further use and save themselves some time!
Liquibase - Zarządzanie zmianami w relacyjnych bazach danychMarcinStachniuk
Prezentacja wygłoszona na Wrocławskim JUGu 30 września 2015. Prezentacja opisuje w jaki sposób można zarządzać zmianami w relacyjnych bazach danych i jak ten problem rozwiązuje Liquibase.
2024 State of Marketing Report – by HubspotMarius Sescu
https://www.hubspot.com/state-of-marketing
· Scaling relationships and proving ROI
· Social media is the place for search, sales, and service
· Authentic influencer partnerships fuel brand growth
· The strongest connections happen via call, click, chat, and camera.
· Time saved with AI leads to more creative work
· Seeking: A single source of truth
· TLDR; Get on social, try AI, and align your systems.
· More human marketing, powered by robots
ChatGPT is a revolutionary addition to the world since its introduction in 2022. A big shift in the sector of information gathering and processing happened because of this chatbot. What is the story of ChatGPT? How is the bot responding to prompts and generating contents? Swipe through these slides prepared by Expeed Software, a web development company regarding the development and technical intricacies of ChatGPT!
Product Design Trends in 2024 | Teenage EngineeringsPixeldarts
The realm of product design is a constantly changing environment where technology and style intersect. Every year introduces fresh challenges and exciting trends that mold the future of this captivating art form. In this piece, we delve into the significant trends set to influence the look and functionality of product design in the year 2024.
How Race, Age and Gender Shape Attitudes Towards Mental HealthThinkNow
Mental health has been in the news quite a bit lately. Dozens of U.S. states are currently suing Meta for contributing to the youth mental health crisis by inserting addictive features into their products, while the U.S. Surgeon General is touring the nation to bring awareness to the growing epidemic of loneliness and isolation. The country has endured periods of low national morale, such as in the 1970s when high inflation and the energy crisis worsened public sentiment following the Vietnam War. The current mood, however, feels different. Gallup recently reported that national mental health is at an all-time low, with few bright spots to lift spirits.
To better understand how Americans are feeling and their attitudes towards mental health in general, ThinkNow conducted a nationally representative quantitative survey of 1,500 respondents and found some interesting differences among ethnic, age and gender groups.
Technology
For example, 52% agree that technology and social media have a negative impact on mental health, but when broken out by race, 61% of Whites felt technology had a negative effect, and only 48% of Hispanics thought it did.
While technology has helped us keep in touch with friends and family in faraway places, it appears to have degraded our ability to connect in person. Staying connected online is a double-edged sword since the same news feed that brings us pictures of the grandkids and fluffy kittens also feeds us news about the wars in Israel and Ukraine, the dysfunction in Washington, the latest mass shooting and the climate crisis.
Hispanics may have a built-in defense against the isolation technology breeds, owing to their large, multigenerational households, strong social support systems, and tendency to use social media to stay connected with relatives abroad.
Age and Gender
When asked how individuals rate their mental health, men rate it higher than women by 11 percentage points, and Baby Boomers rank it highest at 83%, saying it’s good or excellent vs. 57% of Gen Z saying the same.
Gen Z spends the most amount of time on social media, so the notion that social media negatively affects mental health appears to be correlated. Unfortunately, Gen Z is also the generation that’s least comfortable discussing mental health concerns with healthcare professionals. Only 40% of them state they’re comfortable discussing their issues with a professional compared to 60% of Millennials and 65% of Boomers.
Race Affects Attitudes
As seen in previous research conducted by ThinkNow, Asian Americans lag other groups when it comes to awareness of mental health issues. Twenty-four percent of Asian Americans believe that having a mental health issue is a sign of weakness compared to the 16% average for all groups. Asians are also considerably less likely to be aware of mental health services in their communities (42% vs. 55%) and most likely to seek out information on social media (51% vs. 35%).
AI Trends in Creative Operations 2024 by Artwork Flow.pdfmarketingartwork
This article is all about what AI trends will emerge in the field of creative operations in 2024. All the marketers and brand builders should be aware of these trends for their further use and save themselves some time!
A report by thenetworkone and Kurio.
The contributing experts and agencies are (in an alphabetical order): Sylwia Rytel, Social Media Supervisor, 180heartbeats + JUNG v MATT (PL), Sharlene Jenner, Vice President - Director of Engagement Strategy, Abelson Taylor (USA), Alex Casanovas, Digital Director, Atrevia (ES), Dora Beilin, Senior Social Strategist, Barrett Hoffher (USA), Min Seo, Campaign Director, Brand New Agency (KR), Deshé M. Gully, Associate Strategist, Day One Agency (USA), Francesca Trevisan, Strategist, Different (IT), Trevor Crossman, CX and Digital Transformation Director; Olivia Hussey, Strategic Planner; Simi Srinarula, Social Media Manager, The Hallway (AUS), James Hebbert, Managing Director, Hylink (CN / UK), Mundy Álvarez, Planning Director; Pedro Rojas, Social Media Manager; Pancho González, CCO, Inbrax (CH), Oana Oprea, Head of Digital Planning, Jam Session Agency (RO), Amy Bottrill, Social Account Director, Launch (UK), Gaby Arriaga, Founder, Leonardo1452 (MX), Shantesh S Row, Creative Director, Liwa (UAE), Rajesh Mehta, Chief Strategy Officer; Dhruv Gaur, Digital Planning Lead; Leonie Mergulhao, Account Supervisor - Social Media & PR, Medulla (IN), Aurelija Plioplytė, Head of Digital & Social, Not Perfect (LI), Daiana Khaidargaliyeva, Account Manager, Osaka Labs (UK / USA), Stefanie Söhnchen, Vice President Digital, PIABO Communications (DE), Elisabeth Winiartati, Managing Consultant, Head of Global Integrated Communications; Lydia Aprina, Account Manager, Integrated Marketing and Communications; Nita Prabowo, Account Manager, Integrated Marketing and Communications; Okhi, Web Developer, PNTR Group (ID), Kei Obusan, Insights Director; Daffi Ranandi, Insights Manager, Radarr (SG), Gautam Reghunath, Co-founder & CEO, Talented (IN), Donagh Humphreys, Head of Social and Digital Innovation, THINKHOUSE (IRE), Sarah Yim, Strategy Director, Zulu Alpha Kilo (CA).
Trends In Paid Search: Navigating The Digital Landscape In 2024Search Engine Journal
The search marketing landscape is evolving rapidly with new technologies, and professionals, like you, rely on innovative paid search strategies to meet changing demands.
It’s important that you’re ready to implement new strategies in 2024.
Check this out and learn the top trends in paid search advertising that are expected to gain traction, so you can drive higher ROI more efficiently in 2024.
You’ll learn:
- The latest trends in AI and automation, and what this means for an evolving paid search ecosystem.
- New developments in privacy and data regulation.
- Emerging ad formats that are expected to make an impact next year.
Watch Sreekant Lanka from iQuanti and Irina Klein from OneMain Financial as they dive into the future of paid search and explore the trends, strategies, and technologies that will shape the search marketing landscape.
If you’re looking to assess your paid search strategy and design an industry-aligned plan for 2024, then this webinar is for you.
5 Public speaking tips from TED - Visualized summarySpeakerHub
From their humble beginnings in 1984, TED has grown into the world’s most powerful amplifier for speakers and thought-leaders to share their ideas. They have over 2,400 filmed talks (not including the 30,000+ TEDx videos) freely available online, and have hosted over 17,500 events around the world.
With over one billion views in a year, it’s no wonder that so many speakers are looking to TED for ideas on how to share their message more effectively.
The article “5 Public-Speaking Tips TED Gives Its Speakers”, by Carmine Gallo for Forbes, gives speakers five practical ways to connect with their audience, and effectively share their ideas on stage.
Whether you are gearing up to get on a TED stage yourself, or just want to master the skills that so many of their speakers possess, these tips and quotes from Chris Anderson, the TED Talks Curator, will encourage you to make the most impactful impression on your audience.
See the full article and more summaries like this on SpeakerHub here: https://speakerhub.com/blog/5-presentation-tips-ted-gives-its-speakers
See the original article on Forbes here:
http://www.forbes.com/forbes/welcome/?toURL=http://www.forbes.com/sites/carminegallo/2016/05/06/5-public-speaking-tips-ted-gives-its-speakers/&refURL=&referrer=#5c07a8221d9b
ChatGPT and the Future of Work - Clark Boyd Clark Boyd
Everyone is in agreement that ChatGPT (and other generative AI tools) will shape the future of work. Yet there is little consensus on exactly how, when, and to what extent this technology will change our world.
Businesses that extract maximum value from ChatGPT will use it as a collaborative tool for everything from brainstorming to technical maintenance.
For individuals, now is the time to pinpoint the skills the future professional will need to thrive in the AI age.
Check out this presentation to understand what ChatGPT is, how it will shape the future of work, and how you can prepare to take advantage.
A brief introduction to DataScience with explaining of the concepts, algorithms, machine learning, supervised and unsupervised learning, clustering, statistics, data preprocessing, real-world applications etc.
It's part of a Data Science Corner Campaign where I will be discussing the fundamentals of DataScience, AIML, Statistics etc.
Time Management & Productivity - Best PracticesVit Horky
Here's my presentation on by proven best practices how to manage your work time effectively and how to improve your productivity. It includes practical tips and how to use tools such as Slack, Google Apps, Hubspot, Google Calendar, Gmail and others.
The six step guide to practical project managementMindGenius
The six step guide to practical project management
If you think managing projects is too difficult, think again.
We’ve stripped back project management processes to the
basics – to make it quicker and easier, without sacrificing
the vital ingredients for success.
“If you’re looking for some real-world guidance, then The Six Step Guide to Practical Project Management will help.”
Dr Andrew Makar, Tactical Project Management
Unlocking the Power of ChatGPT and AI in Testing - A Real-World Look, present...Applitools
During this webinar, Anand Bagmar demonstrates how AI tools such as ChatGPT can be applied to various stages of the software development life cycle (SDLC) using an eCommerce application case study. Find the on-demand recording and more info at https://applitools.info/b59
Key takeaways:
• Learn how to use ChatGPT to add AI power to your testing and test automation
• Understand the limitations of the technology and where human expertise is crucial
• Gain insight into different AI-based tools
• Adopt AI-based tools to stay relevant and optimize work for developers and testers
* ChatGPT and OpenAI belong to OpenAI, L.L.C.
More than Just Lines on a Map: Best Practices for U.S Bike Routes
This session highlights best practices and lessons learned for U.S. Bike Route System designation, as well as how and why these routes should be integrated into bicycle planning at the local and regional level.
Presenters:
Presenter: Kevin Luecke Toole Design Group
Co-Presenter: Virginia Sullivan Adventure Cycling Association
Ride the Storm: Navigating Through Unstable Periods / Katerina Rudko (Belka G...DevGAMM Conference
Has your project been caught in a storm of deadlines, clashing requirements, and the need to change course halfway through? If yes, then check out how the administration team navigated through all of this, relocating 160 people from 3 countries and opening 2 offices during the most turbulent time in the last 20 years. Belka Games’ Chief Administrative Officer, Katerina Rudko, will share universal approaches and life hacks that can help your project survive unstable periods when there seem to be too many tasks and a lack of time and people.
A report by thenetworkone and Kurio.
The contributing experts and agencies are (in an alphabetical order): Sylwia Rytel, Social Media Supervisor, 180heartbeats + JUNG v MATT (PL), Sharlene Jenner, Vice President - Director of Engagement Strategy, Abelson Taylor (USA), Alex Casanovas, Digital Director, Atrevia (ES), Dora Beilin, Senior Social Strategist, Barrett Hoffher (USA), Min Seo, Campaign Director, Brand New Agency (KR), Deshé M. Gully, Associate Strategist, Day One Agency (USA), Francesca Trevisan, Strategist, Different (IT), Trevor Crossman, CX and Digital Transformation Director; Olivia Hussey, Strategic Planner; Simi Srinarula, Social Media Manager, The Hallway (AUS), James Hebbert, Managing Director, Hylink (CN / UK), Mundy Álvarez, Planning Director; Pedro Rojas, Social Media Manager; Pancho González, CCO, Inbrax (CH), Oana Oprea, Head of Digital Planning, Jam Session Agency (RO), Amy Bottrill, Social Account Director, Launch (UK), Gaby Arriaga, Founder, Leonardo1452 (MX), Shantesh S Row, Creative Director, Liwa (UAE), Rajesh Mehta, Chief Strategy Officer; Dhruv Gaur, Digital Planning Lead; Leonie Mergulhao, Account Supervisor - Social Media & PR, Medulla (IN), Aurelija Plioplytė, Head of Digital & Social, Not Perfect (LI), Daiana Khaidargaliyeva, Account Manager, Osaka Labs (UK / USA), Stefanie Söhnchen, Vice President Digital, PIABO Communications (DE), Elisabeth Winiartati, Managing Consultant, Head of Global Integrated Communications; Lydia Aprina, Account Manager, Integrated Marketing and Communications; Nita Prabowo, Account Manager, Integrated Marketing and Communications; Okhi, Web Developer, PNTR Group (ID), Kei Obusan, Insights Director; Daffi Ranandi, Insights Manager, Radarr (SG), Gautam Reghunath, Co-founder & CEO, Talented (IN), Donagh Humphreys, Head of Social and Digital Innovation, THINKHOUSE (IRE), Sarah Yim, Strategy Director, Zulu Alpha Kilo (CA).
Trends In Paid Search: Navigating The Digital Landscape In 2024Search Engine Journal
The search marketing landscape is evolving rapidly with new technologies, and professionals, like you, rely on innovative paid search strategies to meet changing demands.
It’s important that you’re ready to implement new strategies in 2024.
Check this out and learn the top trends in paid search advertising that are expected to gain traction, so you can drive higher ROI more efficiently in 2024.
You’ll learn:
- The latest trends in AI and automation, and what this means for an evolving paid search ecosystem.
- New developments in privacy and data regulation.
- Emerging ad formats that are expected to make an impact next year.
Watch Sreekant Lanka from iQuanti and Irina Klein from OneMain Financial as they dive into the future of paid search and explore the trends, strategies, and technologies that will shape the search marketing landscape.
If you’re looking to assess your paid search strategy and design an industry-aligned plan for 2024, then this webinar is for you.
5 Public speaking tips from TED - Visualized summarySpeakerHub
From their humble beginnings in 1984, TED has grown into the world’s most powerful amplifier for speakers and thought-leaders to share their ideas. They have over 2,400 filmed talks (not including the 30,000+ TEDx videos) freely available online, and have hosted over 17,500 events around the world.
With over one billion views in a year, it’s no wonder that so many speakers are looking to TED for ideas on how to share their message more effectively.
The article “5 Public-Speaking Tips TED Gives Its Speakers”, by Carmine Gallo for Forbes, gives speakers five practical ways to connect with their audience, and effectively share their ideas on stage.
Whether you are gearing up to get on a TED stage yourself, or just want to master the skills that so many of their speakers possess, these tips and quotes from Chris Anderson, the TED Talks Curator, will encourage you to make the most impactful impression on your audience.
See the full article and more summaries like this on SpeakerHub here: https://speakerhub.com/blog/5-presentation-tips-ted-gives-its-speakers
See the original article on Forbes here:
http://www.forbes.com/forbes/welcome/?toURL=http://www.forbes.com/sites/carminegallo/2016/05/06/5-public-speaking-tips-ted-gives-its-speakers/&refURL=&referrer=#5c07a8221d9b
ChatGPT and the Future of Work - Clark Boyd Clark Boyd
Everyone is in agreement that ChatGPT (and other generative AI tools) will shape the future of work. Yet there is little consensus on exactly how, when, and to what extent this technology will change our world.
Businesses that extract maximum value from ChatGPT will use it as a collaborative tool for everything from brainstorming to technical maintenance.
For individuals, now is the time to pinpoint the skills the future professional will need to thrive in the AI age.
Check out this presentation to understand what ChatGPT is, how it will shape the future of work, and how you can prepare to take advantage.
A brief introduction to DataScience with explaining of the concepts, algorithms, machine learning, supervised and unsupervised learning, clustering, statistics, data preprocessing, real-world applications etc.
It's part of a Data Science Corner Campaign where I will be discussing the fundamentals of DataScience, AIML, Statistics etc.
Time Management & Productivity - Best PracticesVit Horky
Here's my presentation on by proven best practices how to manage your work time effectively and how to improve your productivity. It includes practical tips and how to use tools such as Slack, Google Apps, Hubspot, Google Calendar, Gmail and others.
The six step guide to practical project managementMindGenius
The six step guide to practical project management
If you think managing projects is too difficult, think again.
We’ve stripped back project management processes to the
basics – to make it quicker and easier, without sacrificing
the vital ingredients for success.
“If you’re looking for some real-world guidance, then The Six Step Guide to Practical Project Management will help.”
Dr Andrew Makar, Tactical Project Management
Unlocking the Power of ChatGPT and AI in Testing - A Real-World Look, present...Applitools
During this webinar, Anand Bagmar demonstrates how AI tools such as ChatGPT can be applied to various stages of the software development life cycle (SDLC) using an eCommerce application case study. Find the on-demand recording and more info at https://applitools.info/b59
Key takeaways:
• Learn how to use ChatGPT to add AI power to your testing and test automation
• Understand the limitations of the technology and where human expertise is crucial
• Gain insight into different AI-based tools
• Adopt AI-based tools to stay relevant and optimize work for developers and testers
* ChatGPT and OpenAI belong to OpenAI, L.L.C.
More than Just Lines on a Map: Best Practices for U.S Bike Routes
This session highlights best practices and lessons learned for U.S. Bike Route System designation, as well as how and why these routes should be integrated into bicycle planning at the local and regional level.
Presenters:
Presenter: Kevin Luecke Toole Design Group
Co-Presenter: Virginia Sullivan Adventure Cycling Association
Ride the Storm: Navigating Through Unstable Periods / Katerina Rudko (Belka G...DevGAMM Conference
Has your project been caught in a storm of deadlines, clashing requirements, and the need to change course halfway through? If yes, then check out how the administration team navigated through all of this, relocating 160 people from 3 countries and opening 2 offices during the most turbulent time in the last 20 years. Belka Games’ Chief Administrative Officer, Katerina Rudko, will share universal approaches and life hacks that can help your project survive unstable periods when there seem to be too many tasks and a lack of time and people.
Ride the Storm: Navigating Through Unstable Periods / Katerina Rudko (Belka G...
wstęp do funkcji okienkowych
1. Wstęp do funkcji okienkowych
w MS SQL Server
Rafał Suchorski
1
poczta@suchorscy.pl
2. Plan
• Przykład
• Co to jest „okno” i jakie ma funkcje?
• Jakie właściwości może mieć okno?
• Gdzie można użyć funkcji okna
• Gdzie można użyć funkcji okna… chociaż teoretycznie nie można
• Funkcje agregujące
• Funkcje rankingowe
• Funkcje przesunięcia
• Funkcje rozkładu statystycznego (bez detali)
• Na co zwrócić uwagę?
• Na co czekamy?
2
3. Przykład
• Zrobić raport z widoku Sales.OrderValues
• Pokazać:
• Numer zamówienia,
• Datę zamówienia,
• ID klienta,
• Wartość zamówienia
• Wartość wszystkich zamówień klienta
• Wartość wszystkich zamówień
• Ranking zamówienia wg wartości
• Posortować wynik po ID klienta i dacie zamówienia rosnąco.
• Uwzględnić tylko zamówienia z roku 2008
3
4. Co to jest „okno” i jakie ma funkcje?
• Koncepcja opisana w standardzie języka SQL (wspieranego przez ISO, ANSI)
• Okno to zakres wierszy względem wiersza bieżącego
• Funkcja okienkowa to funkcja stosowana dla wszystkich wierszy okna
• Opierają się na koncepcji wyznaczania zakresu okna, czyli stosowaniu
różnych obliczeń na zbiorze wierszy (oknie) i otrzymywaniu pojedynczej
wartości dla każdego wiersza.
• Standard języka SQL opisuje więcej funkcji, niż jest dostępnych w MS SQL
Server
• Funkcje okna można rozpoznać po klauzuli OVER() – ale są wyjątki (NEXT
VALUE FOR)
4
5. Jakie właściwości może mieć okno?
Klauzula OVER() może mieć 3 części definicji (zależnie od funkcji) :
• PARTYCJA
• PARTITION BY ….
• Lista kolumn lub wyrażeń, w których zmiana wartości powoduje „liczenie od nowa”
• Domyślnie – cały zbiór to jedna partycja
• PORZĄDEK
• ORDER BY….
• Kolejność wierszy w ramach partycji
• RAMY – ROZMIAR OKNA
• ROWS – przesunięcie o liczbę wierszy od bieżącego wiersza, dodaje wewnętrzną
sekwencję powodującą, że każdy wiersz jest inny
• RANGE – przesunięcie o logiczną różnicę między wartością początkową bieżącego
wiersza a wartością granicy
5
6. Jakie właściwości może mieć okno? cd.
• RAMY – ROZMIAR OKNA
• ROWS – pełne wsparcie w SQLServer 2012, częściowe w SQLServer 2005
• RANGE – częściowe wsparcie w SQLServer 2012
• EXCLUDE – standard SQL opisuje, SQLServer 2012 nie wspiera
• Domyślny rozmiar okna:
RANGE BETWEEN UNBOUNDED PROCEDING AND CURRENT ROW
6
7. Jakie właściwości może mieć okno? cd.
• ROWS
• RANGE
OD DO
UNBOUNDED UNBOUNDED
<n> PRECEDING AND <n> FOLLOWING
<n> FOLLOWING <n> PRECEDING
CURRENT ROW CURRENT ROW
OD DO
UNBOUNDED UNBOUNDED
<n> PRECEDING AND <n> FOLLOWING
<n> FOLLOWING <n> PROCEDING
CURRENT ROW CURRENT ROW
INTERVAL <n> PRECEDING 7
8. Gdzie można użyć funkcji okienkowych?
• Logika przetwarzania zapytań
1. FROM
2. WHERE
3. GROUP BY
4. HAVING
5. SELECT
1. Przetwarzanie wyrażeń
2. Usunięcie powtórzeń
6. ORDER
8
9. Gdzie można użyć funkcji okienkowych
(chociaż teoretycznie nie można)
• DELETE
• UPDATE
9
10. Funkcje agregujące
• Od wersji 2005, ale tylko z 1 częścią definicji: partycją
• Nazwy takie same jak funkcji agregacji w klauzulach grupujących:
SUM(), MIN(), MAX(), AVG(), COUNT()…
• Od wersji 2012 wspierane są 3 części definicji: partycja, porządek i
rama.
• Nie wspierana jest opcja DISTINCT
10
11. Funkcje rankingowe
• Dostępne od SQLServer 2005, z 2 częściami definicji: partycją i
porządkiem
• ROW_NUMBER()
• NTILE()
• RANK()
• DENSE_RANK()
• OBOWIĄZKOWA KLAUZULA „ORDER BY”
11
12. Funkcje rankingowe – ROW_NUMBER()
• Generuje unikatowe numery wierszy w partycji – nawet gdy wiersze
te mają te same wartości porządkowe ( wartości atrybutów w
porządku okna)
• Może więc dawać wartości przypadkowe (!) jeśli nie określimy
dokładnie porządku okna. Klauzula ORDER BY jest obowiązkowa, ale
można oszukać SQLServer i uzyskać w pełni przypadkowe numery.
• Wartość wyznaczona przez funkcję nie ma związku z kolejnością
prezentowaną w wyniku
12
13. Funkcje rankingowe – NTILE()
• Pozwala na podział wierszy w partycji na części - mniej więcej
równoliczne.
• Jest odwrotna do stronicowania - liczba podzbiorów jest stała, a
rozmiar podzbioru dynamiczny
• Podobnie jak ROW_NUMER() jest niedeterministyczna – może
zwracać wyniki przypadkowe
13
14. Funkcje rankingowe – RANK(), DENSE_RANK()
• RANK() – ranking
• DENSE_RANK() – ranking z ciągłością numeracji
• Są przydatne, gdy zbiór ma wartości powtarzające się – jeśli ich nie
ma, dają taki wynik jak ROW_NUMBER()
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15. Funkcje przesunięcia
• Od wersji 2012
• Wspierają klauzule PARTITION_BY i ORDER_BY
• Przesunięcie względem bieżącego wiersza:
• LAG()
• LEAD()
• Przesunięcie wyliczane w oparciu o brzegi okna:
• FIRST_VALUE()
• LAST_VALUE()
• NTH_VALUE()
• WSPIERAJĄ TAKŻE KLAUZULĘ RAMY ROWS / RANGE
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16. Funkcje przesunięcia – LAG(), LEAD()
• Zwracają wartość z wiersza partycji przesuniętego o n wierszy
• LAG() – wiersze wcześniejsze
• LEAD() – wiersze późniejsze
• Domyślne przesunięcie to 1 wiersz (drugi parametr)
• Domyślnie brak wartości prezentowany jako NULL (trzeci parametr)
• Wywołanie: LAG(wartość_zwracana, przesunięcie,
wartość_gdy_NULL)
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17. Funkcje przesunięcia – FIRST_VALUE(),
LAST_VALUE()
• Wspierają określenie ramy okna
• LAST_VALUE() daje niepożądane efekty (!) przy nieświadomym użyciu
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18. Funkcje rozkładu statystycznego
• Dostępne od wersji 2012
• Rozkład rankingu:
• PERCENT_RANK() OVER(P, O) = (rank-1)/(count-1)
• CUME_DIST() OVER(P, O) = 1-((count-rank)/count)
• Rozkład odwrotny:
• Przydatne przy wyliczaniu np. mediany
• Specyficzna składnia, po ORDER BY może być tylko jedna kolumna
• PERCENTILE_DISC(0..1) WITHIN GROUP (ORDER BY) OVER(P)
• Zwraca wartość z kolumny ORDER BY z pierwszego wiersza, gdzie Cume_Dist >=
parametr
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19. Funkcje rozkładu statystycznego cd.
• PERCENTILE_CONT(0..1) WITHIN GROUP (ORDER BY) OVER(P)
RN = (1 + (P * ( N - 1 ))
P = Percentile Specified N = Number of rows
CRN = CEILING(RN) FRN = FLOOR(RN).
If (CRN = FRN = RN) then the result is [value of expression from row at RN]
Otherwise the result is
(CRN - RN) * (value of expression for row at FRN) +
(RN - FRN) * (value of expression for row at CRN)
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20. Na co zwrócić uwagę?
• Operatory w planach zapytań:
• Segment – definicja warunków dla resetowania funkcji (koniec okna lub
koniec partycji)
• Sort – sortowanie, bardzo kosztowne, złożoność = n*log(n))
• Sequence project – generuje kolejne liczby
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21. Na co zwrócić uwagę? cd.
• WINDOW SPOOL – tabela podręczna, zapamiętuje wartości agregacji pośrednich.
Tworzona w pamięci (WORKTABLE logical read=0) lub w tempdb.
• TABLE SPOOL – tabela robocza, zawsze w tempdb
• Indeks POC (filtering, Partitioning, Ordering, Covering) jeśli chcemy
uniknąć operacji SORT
• Skanowanie „wstecz” zawsze szeregowe, „w przód” – równoległe.
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22. Na co czekam(y)?
• Pełna obsługa RANGE (INTERVAL)
• Definiowanie parametru wielkości okna przy zapisie do TEMPDB
• WIELOKROTNE WYKORZYSTANIE FUNKCJI OKNA
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23. Podsumowania…
• 2005:
• funkcje rankingowe
• funkcje agregujące
• 2012:
• funkcje analityczne
• funkcje przesunięcia
• rozszerzenie funkcji agregujących o klauzulę ORDER BY
• wprowadzenie ram – domyślnie RANGE (!)
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118, 119
Window spool - Służy do pobrania dla każdego wiersza źródłowego wszystkich wierszy ramy. Do tempdb dane trafiają, gdy ilość wierszy w ramce jest większa niż 10 000 dla ROWS lub zawsze dla RANGE. Dlatego ROWS jest szybsze !
Można to sprawdzić przy XEvents lub statystykami IO.
Równoległe skanowanie wstecz nie jest jeszcze zaimplementowane, należy rozważyć indeks w tej kolejności