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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

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 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
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Hadoop Bigdata a Quick Story for Dummies

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Mike Olson is one of the fundamental brains behind the Hadoop development. Yet even he looks at the new type of "Big Data" programming utilized inside Google. Mike Olson runs an organization that represents considerable authority on the planet's most sultry programming.
He's the CEO of Cloudera, a Silicon Valley startup that arrangements in Hadoop, an open source programming stage focused around tech that transformed Google into the most predominant drive on the web.
Hadoop is relied upon to fuel an $813 million product advertise by the year 2016. In any case even Olson says it’s as of now old news. Hadoop sprung from two exploration papers Google distributed in late 2003 and 2004. One portrayed the Google File System, a method for putting away enormous measures of data crosswise over a great many extremely inexpensive machine servers, and the other nitty gritty Mapreduce, which pooled the preparing power inside each one of those servers and crunched all that data into something valuable. After eight years, Hadoop is generally utilized over the web for data dissection and assorted types of other number-crunching assignments. Anyway Google has proceeded onward.

In 2009, the web monster began supplanting GFS and Mapreduce with new advances, and Mike Olson will let you know that these innovations are the place the world is going. "On the off chance that you need to comprehend what the expansive scale, elite data preparing foundation without bounds resembles, my recommendation would be to peruse the Google exploration papers that are turning out at this time," Olson said amid a late board talk close by Wired.

On the off chance that you need to realize what the extensive scale, elite data preparing framework without bounds resembles, my recommendation would be to peruse the Google examination papers that are turning out at this moment.

Since the ascent of Hadoop, Google has distributed three especially fascinating papers on the framework that underpins its monstrous web operation. One subtle elements of Caffeine is the product stage that assembles the file for Google web search tool. An alternate show off Pregel, a "diagram database" intended to guide the connections between unfathomable measures of online data. However the most charming paper is the particular case that depicts an instrument called Dremel.
"If you had let me know heretofore me what Dremel cases to do, I wouldn't have trusted you could manufacture it," says Armando Fox, an educator of software engineering at the University of California, Berkeley who has some expertise in these sorts of data-focus measured programming stages.
Dremel is a method for dissecting data. Running crosswise over a great many servers, it gives you a chance to "question" a lot of data, for example, an accumulation of web reports or a library of advanced books or even the data depicting a huge number of spam messages. This is much the same as breaking down a conventional database utilizing SQL, the Structured Query Language that has been generally utilized over the product world for quite a long time. On the off chance that you have a gathering of computerized books, case in point, you could run a specially appointed question that provides for you a rundown of every last one of writers - or a rundown of every last one of writers who spread a specific subject.
You have a SQL-like dialect that makes it simple to form specially appointed questions or repeating inquiries - and you don't need to do any programming. You simply sort the inquiry into a summon line," says Urs Hölzle, the man who updates Google base.
The distinction is that Dremel can deal with web-sized measures of data at blasting quick speed. As indicated by Google's paper, you can run questions on various petabytes (a large number of gigabytes) in a matter of seconds.

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