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Medium 9780596006327

18. Model Queries

Slice ePub May 27, 2014

Some complex calculations are not easily amenable to SQL. Tasks such as forecasting sales, computing market share, solving simultaneous equations, analyzing time series, and so on involve iterative calculations, often referencing interdependent rows across multiple dimensions. It becomes extremely difficult to solve such problems in SQL, and the resultant SQL code becomes very difficult to understand and maintain. Such SQL often involves multiple levels of subqueries, joins, and UNIONs, and therefore performs inefficiently.

Rather than use SQL to solve problems such as we've just described, people usually download the data to a spreadsheet and perform the computations there. Some applications move data into specially created, external calculation engines that can perform the necessary computations efficiently. Downloading data into spreadsheets, or moving data into special-purpose engines, involves overhead and adversely impacts performance, scalability, manageability, and security of the system managing the data.

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Medium 9781741795646

Day Trips from Moscow

Slice ePub May 27, 2014

Abramtsevo Click here

Artists colony and country estate, Abramtsevo was a font of artistic inspiration for the renaissance of traditional Russian painting, sculpture, architecture and arts in the 19th century.

Sergiev Posad Click here

Site of the Trinity Monastery of St Sergei, Sergiev Posad is the most visited destination in the Golden Ring (series of ancient towns northeast of Moscow), because of its accessibility from Moscow and its atmosphere of history and holiness.

Vladimir Click here

The ancient town of Vladimir – 12th-century capital of medieval Rus – was formative in establishing a distinctively Russian architectural style. The city still shows off several remarkable structures that date back to this heyday.

Suzdal Click here

Dating to the 11th century, Suzdal was a medieval capital and a spiritual centre in later years. The village is still ringed with monasteries and peppered with merchant churches, making for an ideal fairy-tale setting.

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Medium 9781936763054

Chapter Two: Co-Teaching the RTI and PLC Way

Slice PDF September 24, 2014

Aaron Hansen is a leadership consultant with the Northeastern Nevada Regional Professional Development Program and a Solution Tree associate. Previously, he led the transformation of White Pine Middle School (WPMS) into a nationally recognized high-achieving school in

Nevada. Under Aaron’s leadership, WPMS was named a National Model School (2009–2012) and the only middle school in the country to earn the title School of

Distinction by the International Center for Leadership in Education in 2010. WPMS is listed on www.allthingsplc.info as a model of effectiveness. The school was also named a Nevada Title I Distinguished School and has received many other awards, recognitions, and honors. Aaron has been featured on

ABC’s World News With Charles Gibson, CNN’s American Morning, Fox Network’s

Fox and Friends, and in a BBC documentary about effective anti-bullying programs and building positive school cultures. Aaron was named Nevada’s Innovative Educator of the Year in 2009. He has worked with numerous schools and districts across the United States, helping them improve their processes in PLCs, RTI, teacher and leader improvement, and positive culture transformation.

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Medium 9781449321888

5. (Re)Organizing the Web’s Data

Slice ePub May 27, 2014

The first, and sometimes hardest part of doing any data analysis is acquiring the data from which you hope to extract information. Whether you want to look at your personal spending habits, calculate your next trade in fantasy baseball, or compare a politicians investment returns to your own, the data you need is usually there on the web with some sense of order to it, but its probably not in a form thats very useful for analysis. If this is the case, youll need to either manually gather the data or write a script to collect the data for you.

The granddaddy of all data formats is the data table, with a column for each attribute and a row for each observation. Youve seen this if youve ever used Microsoft Excel, relational databases, or Rs data.frame object.

Table5-1.An example data table

2012-01-01

adamlaiacano

2

2012-01-01

david

4

2012-01-01

dallas

6

2012-01-02

adamlaiacano

0

2012-01-02

david

4

2012-01-02

dallas

6

Most websites store their data behind the scenes in tables within relational databases, and if those tables were accessible to the computing public, this chapter of Bad Data Handbook wouldnt need to exist. However, its a web designers job to make this information visually appealing and interpretable, which usually means theyll only present the reader with a relevant subset of the dataset, such as a single companys stock price over a specific date range, or recent status updates from a single users social connections. Even online database websites are vastly different from a programmers version of a database. On web database websites such as LexisNexis or Yahoo! Finance, there are page dividers, text formatting, and other pieces of code to make the page look prettier and easier to interpret. To a programmer, a database is a complete collection of clean, organized data that is easily extracted and transformed into the form you see on the web. So now its your job to reverse-engineer the many different pages and put the data back to a form that resembles the original database form.

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Medium 9781741799385

Alsergrund & the University District

Slice ePub May 27, 2014

Alsergrund & the University District

For more detail of this area see Neigbourhood Map»

Feeling the Freud as you explore the elegant rooms of his former home, with exhibits providing a tantalising insight into the life and cognitive workings of the psycho­analysis godfather.

Tiptoeing through the baroque apartments and landscaped gardens of the Palais Liechtenstein on a guided tour.

Going for an erudite wander through the arcades and courtyards of Vienna’s 650-year-old university.

Taking a romp through the one-time abodes of two classical giants: Beethoven Click here and Schubert Click here.

Listening to a pianist play in the vaulted, marble-columned grandeur of Café Central.

Book-ended by one of Europe’s biggest universities, Alsergrund in the 9th district can hold its own in the world’s hall of intellectual fame, counting Mahler and Karl Kraus among its alumni. In these elegant streets, Schubert first saw the light of day and Sigmund Freud navigated the unconscious mind’s murky depths. The gravitas of such history still seeps through artily shabby cafes and cavern-like bars, where students contemplate life with beer-glass-clinking conviction. University life sits neatly within the framework of this cultured neighbourhood of churches, leafy squares and gardens, such as those framing the baroque Palais Liechtenstein.

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