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Top 20 R Programming Interview Questions and Answers
Top 20 R Programming Interview Questions and Answers: 1. Explain about data import in R language R Commander is used to importing data in R language. To start the R commander GUI, the user must type in the command Rcmdr into the console. There are 3 different ways in which data can be imported in R language- Users can select the data set in the dialog box or enter the name of the dataset (if they know). Data can also be entered directly using the editor of R Commander via Data->New Data Set. However, this works well when…
Top 20 Java Interview Questions and Answers
Top 20 Java Interview Questions and Answers 1. What is the difference between JDK, JRE and JVM? JVM: JVM is an acronym for Java Virtual Machine, it is an abstract machine which provides the runtime environment in which java bytecode can be executed. It is a specification. JVMs are available for many hardware and software platforms (so JVM is platform dependent). JRE: JRE stands for Java Runtime Environment. It is the implementation of JVM. JDK: JDK is an acronym for Java Development Kit. It physically exists. It contains JRE…
Top 20 OBIEE Interview Questions and Answers
1. Mention what is OBIEE? Obiee stands for Oracle Business Intelligence Enterprise Edition (OBIEE). It is a business intelligence system for the enterprise that delivers abilities for reporting, online analytical processing (OLAP), ad hoc query and analysis dashboards, and scorecards. 2. Mention what are the features of OBIEE? Key features of OBIEE includes, Hierarchy Drilling Scheduled Report Generation Graphical Reporting (Charts, Pivots, Gauges, ) Ad Hoc Analysis Global support and development capability 3. Mention what…
Top 10 ETL Testing Interview Questions and Answers
Top 10 ETL Testing Interview Questions and Answers 1. What is ETL? ETL means extract, transform and load, three database functions that are combined into one tool to pull data out of one database and place it into another database. Extract is the process of reading data from a database. 2. What are the popular ETL tools available in the market? The popular ETL tools available in the market are − Informatica − Power Centre IBM − Websphere DataStage (Formerly known as Ascential DataStage) SAP − Business Objects Data Services…