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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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30 High Paying Tech Jobs,$110,000 Plus Salary

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There is a growing demand for software developers across the globe. These 30 highly paying IT jobs really worth.

PaaS or "Platform as a Service" is a type of cloud computing technology. It hosts everything that a developer needs to write an app. These apps once written, would live on PaaS cloud.
Paas++jobs

Cassandra is a free and open source NoSQL database. It's a kind of database that can handle and store data of different types and sizes of data and it's increasingly the go-to database for mobile and cloud applications. Several IT companies including Apple and Netflix use Cassandra.
Cassandra+jobs

MapReduce has been called "the heart of Hadoop." MapReduce is the method that allows Hadoop to store all kinds of data across many low-cost computer servers. To get meaningful data of Hadoop, a programmer writes software programs (often in the popular language, Java) for MapReduce.
Mapreduce+jobs

30 High Paying IT Jobs

Cloudera is a company that makes a commercial version of Hadoop. Although Hadoop is a free and open-source-project for storing large amounts of data on inexpensive computer servers, the free version of Hadoop is not easy to use. Several companies have created friendlier versions of Hadoop, and Cloudera is arguably the most popular one.
Cloudera+jobs
30 high paying it jobs
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Hbase is yet another project based on the popular Hadoop technology. Hadoop is a way to store all kinds of data across many low-cost computer servers. Once that data is stored using the Hadoop Distributed File System (HDFS), HBase can sort through that data and group bits of data together, somewhat similar to how a traditional database organizes data.
HBase+jobs

Pig is another hot skill, thanks to demand for technologies like Big Data and Hadoop. Pig is a programming language that helps extract information from Hadoop like find answers to certain questions or otherwise use the data.
Pig+bigdata+jobs

Advanced Business Application Programming or ABAP is the software language developed by SAP for building business applications on top of its business application suite. Businesses often want to write custom apps that make use of the data stored in SAP. Developers also write commercial apps for SAP.
ABAP+jobs

The chef is "IT automation" software from Chef Software, one of a handful of young companies ushering in a huge new tech trend called "DevOps." DevOps is when the developers building applications ("dev") and IT people deploying them (operations or "ops") work together to use speedy techniques so they can deploy technology as fast as it's released. Chef helps IT professionals automate tasks that keep computer servers running efficiently.
Chef+software+jobs

Flume is yet another skill spawned from Big data" craze and the popularity of Hadoop. Hadoop is a way to store all kinds of data across many low-cost computer servers. Flume is a method to move massive amounts of data from the place it was created into a Hadoop system.
Flume+software+jobs

Hadoop is a crucial technology at the center of the whole Big Data. It is an open source software used to gather and store vast amounts of data and analyze it on low-cost commodity hardware. For instance, banks may use Hadoop for fraud detection, and online shopping services could use it to analyze customers' buying patterns.
Hadoop+jobs

Hive is yet another hot in-demand skill, courtesy Big Data and the popularity of Hadoop. Hadoop is a way to store all kinds of data across many low-cost computer servers. Hive provides a way to extract information from Hadoop using the same kind of traditional methods used by regular databases. (In geek speak: it gives Hadoop a database query interface).
Hive+jobs

Puppet is "IT automation" software from Puppet Labs, one of the handful of young companies ushering in the new tech trend called "DevOps." DevOps is a software development method where developers creating software ("dev") and the teams responsible for deploying that software ("ops) use speedy techniques to improve deployment time and cut time-to-market. Puppet helps them automate tasks that keep computer servers running efficiently.
Puffet+automation+jobs

NoSQL is a new kind of database that is part of the big data phenomenon. NoSQL has sometimes been called the cloud database. Regular databases need data to be organized. Names and account numbers need to be structured and labeled. But noSQL doesn't care about that. It can work with all kinds of documents.
NoSQL+jobs

Zookeeper is a free and open-source project that also came from the big data craze, particularly the uber-popular tech called Hadoop. Hadoop is a way to store all kinds of data across many low-cost computer servers. Zookeeper is like a file system, a way to name, locate, and sync files used in Hadoop. But now it's being used with other big-data technologies beyond Hadoop.
Zookeeper+jobs

Service-oriented architecture or SOA or is actually an old term for a software concept that's growing increasingly popular, thanks to cloud computing. Practitioners of it write their code in small bites, making little "services" that can be shared among multiple apps. Instead of every cloud app needing its own way of dealing with passwords, for instance, a "password service" can be shared by many.
SOA+jobs

The data architect is another in-demand job, thanks again to the Big Data craze. It involves designing IT systems that store data, including figuring out which data should a company keep, how long, where, how, what business units get access to it, and so on.
Data+Architect+jobs

Solr is a free and open source enterprise search platform that is extremely popular with large websites. Some of its users include eHarmony, StubHub, and BestBuy, and many others.
Solr+web+development+jobs

Data Scientist-There is data scientists that work on the tech side, the marketing side, and just about every other area of business these days, and in just about every size company.
Data+Scientist+jobs

Big Data is one of the most in-demand technology. Startups, big tech vendors, companies big and small are all jumping on the big data craze. It is used to handle massive amounts of information in all sorts of formats -- tweets, posts, e-mails, documents, audio, video and whatever.
Big+data+jobs

OpenStack-Another popular free and open source cloud computing operating system is OpenStack. Many vendors are supporting it and selling their own commercial versions of it, such as IBM, HP, Red Hat, Ubuntu, and others.
Open+Stack+jobs

CMMI is a sophisticated method for performance management. It helps companies predict costs, create schedules and ensure quality. There's a whole CMMI culture that can train someone on the CMMI models and how to use them.
CMMI+Model+jobs

R-At the center of much-in-demand technology Big Data is something called "analytics," the ability to sift through the humongous amount of data and gather business intelligence out of it. R is the language of choice for this. It used for statistical analysis and graphics/visualization.
R+Analytics+jobs

Cloud computing is a big trend and there's a battle over different "cloud operating systems." Several of them are the free and open source, but they're mostly built by vendors who want to sell a commercial version along with cloud computing software or equipment.
Cloud+Stack+jobs

OmniGraffle is a diagramming tool just for Macs – like the Mac version of Microsoft Visio.It may seem odd that knowing this tool could help in getting a $110,000 job. But it's also a popular tool for complex diagramming tasks like website wireframes and graphic design.
+OmniGraffle+jobs

Arista makes a computer network switch used in big data centers. Its claim to fame is its operating system software which users can programme to add features, write apps or make changes to the network.
AristA+jobs

EMC Documentum is an "enterprise content management" system. While Big Data options like Hadoop are the new-age way of dealing with data, Documentum remains a popular tool in industries that still use a lot of paper or electronic forms, like legal, medical, insurance, and so on.
EMC+Documentum+jobs

Software designs are increasingly becoming complex and here's where Unified Modeling Language (UML) has a role to play. UML is a visual language for turning complex software designs into an easier-to-understand diagram.
UML+jobs

Sqoop is one of those skills that has zoomed into popularity, thanks to Big Data craze. It's a free and open source tool that lets you transfer data from popular Big Data storage system, Hadoop, into classic relational databases like the ones made by Oracle, IBM, and Microsoft.
Sqoop+Big+data+jobs

JDBC is a Java-based technology from Oracle. It helps a database connection to an application written in the Java programming language. Java is a popular language for writing apps, so lots of skills associated with it pay well and this is one of those skills.
JAVA+JDBC+jobs

Relational Database Management System is a full form of RDBMS, a type of database management system. This is the traditional kind of database that uses the structured query language (SQL) used by databases like Oracle, Microsoft SQL Server, and IBM DB2.
SQL+Server+Oracle+jobs
Ref: TOI

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