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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A

5 Emerging Trends in Data Visualization

Nowadays, we deeply drowned in data of diverse kinds due to the increased computational power and accessibility.

Specifically, in addition to public data available on the Internet (e.g., census, demographics, environmental data), data pertaining personal daily activities are now more easily collected.

For example, through mobile devices that can log people's running distances and time or their manual record of nutrition consumption. Due to such expanded sources of data, there appear new applications that involve data collection, visualization, exploration, and distribution in daily contexts.

These applications do, not only display static information but also let users navigate the data in forms of interactive visualizations.

5 Emerging Trends in Data Visualization.

#1: This emerging trend has brought both opportunities and challenges to interaction designers to develop new approaches to designing data-based applications.

#2: Conveying information has been one of main functions of graphic and communication design since the analog printing era. The focus of information design is the communicative and aesthetic presentation of structured data as in an example of subway route map.

#3: In treating the increasing volumes of unprocessed data accessible either from public media or personal devices, the approaches of information design are now more diverse with the influence of other disciplines (Pousman & Stasko, 2007).

#4: Specifically, unlike information design in a traditional and confined manner, data visualization starts with the data that did not proceed through structuring and exist often in large volumes and complicated formats (Manovich, 2010).

#5: Thus, data visualization requires designers to obtain diverse knowledge and skill sets in addition to their visual aesthetic senses. The new requirements include human visual perception and cognition, statistics, and computational data mining.

How Visualization Applied in End user services 

Moreover, as data visualization has been more broadly applied to end-user services, interaction and experiential qualities need to be more critically considered.

Those qualities of data application do not only rely on the usability of data perception or task-based navigation but also build up on aesthetics that affords engaging and exploratory data navigation.

The latter have been remained as a less investigated area than the former due to the strong disciplinary tradition of data visualization in computer science and cognitive science.

Furthermore, visualizations are presented, used, and shared in diverse contexts from science labs to online journalism sites, to personal mobile devices.

This means that data visualization has become a truly interdisciplinary field of research and practice by weaving informatics, programming, graphic design, and even media art


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