{"id":11233,"date":"2021-08-31T17:28:37","date_gmt":"2021-08-31T17:28:37","guid":{"rendered":"https:\/\/www.monsterindia.com\/career-advice\/etl-testing-interview-questions-11233\/"},"modified":"2023-03-23T13:07:44","modified_gmt":"2023-03-23T07:37:44","slug":"etl-testing-interview-questions","status":"publish","type":"post","link":"https:\/\/www.foundit.in\/career-advice\/etl-testing-interview-questions\/","title":{"rendered":"ETL Testing Interview Questions and answers"},"content":{"rendered":"\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Among lakhs and lakhs of IT students who graduate in a year, every single graduate will be qualified to bag the Software Tester or ETL Tester job. So all we have to concentrate on is how to stand unique from others to grab the employer&#8217;s attention.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Most of the candidates could explain the entire concept of <a href=\"https:\/\/www.monsterindia.com\/search\/software-testing-jobs\">Software Testing<\/a>. But, they may lack the practical experience of choosing the apt and optimized technique to solve the problem while testing <a href=\"https:\/\/www.monsterindia.com\/search\/big-data-jobs\">Big Data<\/a> files. Therefore, this article can guide the candidates on a tour of possible and most frequent ETL Testing Interview Questions.&nbsp;<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>General Questions:<\/strong><\/h2>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Concentrating on<a href=\"https:\/\/www.monsterindia.com\/search\/etl-testing-jobs\"> ETL Testing<\/a> Interview Questions is necessary to handle the technical part of the interview. Though these technical skills matter most in an interview, one can&#8217;t deny that soft skills like presentation, communication, and other<a href=\"https:\/\/www.monsterindia.com\/search\/analytical-skills-jobs\"> analytical skills<\/a> leave a good impression on recruiters. Here are a few general questions and answers that match any interviews.&nbsp;<\/span><\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><a href=\"https:\/\/www.monsterindia.com\/career-advice\/tell-me-about-yourself-the-winning-answer\/\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Tell us about yourself?<\/span><\/a><\/li><li><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">What are your strengths and weaknesses?<\/span><\/li><li><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Who is your inspiration?<\/span><\/li><li><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Tell us about the experience about when and how you overcome your weakness?<\/span><\/li><\/ol>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">In addition to the ETL Testing Interview Questions, going through these general questions will take you nearer to the job you desire.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>Points to be noted before answering these introduction questions:<\/strong><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Don&#8217;t detail your personal information that is irrelevant to this interview.<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Make sure the strength you mention is positive for the job role.<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Don&#8217;t be self-boasting.<\/span><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>ELT Testing:<\/strong><\/h2>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Nowadays, Software testers are equally in demand with software developers. Expert ELT testers are hired in large numbers to handle data of high volumes and diverse types. Here is our effort to address those technical experts who are not exposed to ETL Testing Interview Questions in their careers. After professional research on \u201cETL Testing Interview Questions\u201d across various websites, blogs and books, we finalized the Top 25 ETL Testing Interview Questions with crystal clear answers.&nbsp;<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Tips for facing Software Testing Interview:<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The prior requirement to crack any interview is to possess enough technical knowledge.<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Have a deep knowledge of traditional manual testing skills to Automated Testing, ELT Testing and other related concepts.<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Then refer to multiple sources to practice possible ETL Testing Interview Questions.<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">ETL Testing involves Big Data and Data warehousing concepts. So, learn these and practice the possible ETL Testing Interview Questions on these technologies.<\/span><\/li><\/ul>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">All these are enough to gather sufficient knowledge about ETL Testing. But, these aren\u2019t enough to crack the interview. The<a href=\"https:\/\/www.monsterindia.com\/search\/freshers-jobs\"> fresher<\/a>\u2019s who are new to this Testing industry might not have faced ETL Testing Interview Questions. Therefore, this \u201cTop 25 ETL Testing Interview Questions\u201d article is highly recommendable for any candidate who is keen on experiencing the interview style ETL Testing Interview Questions.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Questions and answers specific to ELT Testing:<\/strong><\/h2>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Before looking at these questions, let\u2019s figure out the possible concepts from which candidates can expect their ETL Testing Interview Questions. Big Data, Business Intelligence, Data warehousing Techniques and SQL are the major components of ETL Testing.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>ETL Testing Interview Questions related to Big Data:<\/strong><\/span><\/h2>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Under this category, we could find questions related to Big Data, Data warehousing and Business Intelligence.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>1. How do ETL Testing and Business Intelligence complement each other?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The ETL Testing assists Business Intelligence in converting unstructured Big Data from various possible sources. The major contribution of ETL testing in BI is removing the noisy data and converting it into standard data with necessary test cases and constraints.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">In turn, Business Intelligence Tools comes as handy assistance to analyse and predict the commercial reach and value with modern Business Intelligence Tools to enhance the business.&nbsp;<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>2. What is a Data warehouse?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The data warehouse is similar to a storage space where the large-scaled businesses store their integrated data and information from widespread sources and aggregate them into single central storage which allows retrieving, modifying or displaying the data through suitable schematic queries whenever needed.&nbsp;<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>3. What are the techniques used in Data warehouse testing?&nbsp;<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The data warehouse testing comprises two techniques to transfer the data from the source to the storage location. They are ELT Testing and Business Intelligence.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">ELT Testing<\/span><\/strong><\/td><td><strong><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Business Intelligence<\/span><\/strong><\/td><\/tr><tr><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">ELT Testing concentrates on the process of extracting, transforming and loading the data.<\/span><\/td><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">BI techniques are used to convert the stored data into reports or insights to the users using BI tools.<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">This ELT Testing is responsible for the process from the source file to the Data warehouse.<\/span><\/td><th><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">This Business Intelligence is responsible for processing the stored data of the data warehouse to the dashboards.<\/span><\/th><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>ETL Testing Interview Questions specific to the testing process:<\/strong><\/h2>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Under this category, one can come across the possible testing types, test cases, and bugs during the ETL testing. In short, these are the highly expectable ETL Testing Interview questions that may be posed to check the depth of a candidate&#8217;s knowledge on ETL Testing.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>4. What is your experience with ETL Testing?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">We worked on a Business Intelligence project where we dealt with the data of a Shopping complex. We processed the structured and unstructured data of the various fields and converted them into a standard schema. In this process, we employed ETL testing to successfully transform data from the source file to the destination by creating necessary test cases like Null Value, Data Validation, and a few more.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>5. Where ELT Testing is used and why?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Business Intelligence is a technique of using profound data as an asset to analyse the needs of the people and develop the business. ETL Testing is best suited for Business Intelligence because they undergo extracts, transforms and load operations in an efficient sequential order.&nbsp; Before storing the data to the destination, it converts the data of various types into a suitable form that fits in the warehouse and cleanses the data, omitting the unwanted data and fixing the bugs. This eases the task of BI tools of presenting the data to the end-user with the already processed data in the warehouse.&nbsp;<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>6. What is ETL Testing?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><em>Extract, Transform and Load <\/em><span style=\"font-weight: 400;\">is the order of the process in <a href=\"https:\/\/www.monsterindia.com\/search\/rtl-testing-jobs\">RTL Testing<\/a>. As the name implies, this is the process of extracting the data from OLTP databases, transforming the data to adapt to the data warehouse framework and loading the data into data marts.&nbsp;<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">For example, the data collected from various sources may be text, spreadsheet, multimedia files. Integrating these data and loading them into the data warehouse after the cleaning process is the main process carried out by ETL.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>7. Explain the phases of ETL?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">ETL Testing process undergoes 5 phases.<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><em>Requirement Analysis<\/em><span style=\"font-weight: 400;\"><em>:<\/em> Requirement Analysis is understanding the business needs and examining the necessary elements to undergo the project.<\/span><\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><em>Test Planning:<\/em><span style=\"font-weight: 400;\"> Acquiring data from the sources and devising a plan to perform the testing process.<\/span><\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><em>Designing:<\/em><span style=\"font-weight: 400;\"> This phase designs suitable business models and develops test cases to execute the testing.<\/span><\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><em>Test Execution:<\/em><span style=\"font-weight: 400;\"> This phase executes the testing with the help of the pre-processed data. They clean the bugs and convert the data as a suitable one for the framework.<\/span><\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><em>Populate data:<\/em><span style=\"font-weight: 400;\"> After performing the necessary calculations and testing, the results are derived from the output. This phase is responsible for such data populating tasks.<\/span><\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><em>Build reports<\/em><span style=\"font-weight: 400;\"><em>: <\/em>This phase generates reports, insights and graphs to present in dashboards or other means for people&#8217;s easy reference.<\/span><\/span><\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">8. Mention a few ETL Testing types?<\/span><\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>Types of ELT Testing&nbsp;<\/strong><\/span><\/td><td><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>Functions<\/strong><\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">GUI \/ Navigation Testing<\/span><\/td><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">This type types the Graphical User Interface and the navigations used with the front end summaries.<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Source to Target Testing<\/span><\/td><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The correctness of the data values from the source file to the target is tested by this type.<\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>9. Which data test type is suitable for testing the data type length?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The metadata testing type tests the conditions, types, index, length and other constraints of the data.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>10. What will be the test case to resolve mistyped values?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The misspelled or mistyped data can be handled by developing a correctness issue test case that checks the wrongly entered values, verifies the NULL, Not Unique and range levels.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>11. What are the bugs you faced while working with ETL Testing?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">&nbsp;I have faced a few bugs while working on a testing project with the data of a shopping complex.&nbsp;<\/span><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Input\/Output Bug:<\/span><\/td><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The system will deny the valid inputs and will accept the invalid and wrong values.<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Calculation Bug:<\/span><\/td><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">&nbsp;<\/span>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The mathematical calculation will return wrong values resulting in the wrong outputs.<\/span><\/p>\n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>12. Differentiate ETL and ELT Testing?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">In simple words, ELT and ETL differ in the order of execution.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><em>Extract Transform Load<\/em><span style=\"font-weight: 400;\"> (ETL): They extract, transform and then load the data.<\/span><\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Extract Load Transform (ELT):&nbsp; They extract, load and then transform the data.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>13. What are the responsibilities an ETL Tester should possess?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">An ETL Tester should possess,<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Validating data sources<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Using extraction methods for data transfer<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Deriving the suitable transformation logic<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Finally, storing the data into data marts or warehouses.<\/span><\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>14. List a few common test cases<\/strong><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Null Validate<\/span><\/td><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Checks the places where the data is not available and verifies the NULL Value in whichever cells it is mentioned.<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Duplicate Check<\/span><\/td><td><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">&nbsp;<\/span>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">To check whether any repetition of the records is present. This is done using the primary, foreign keys to remove the duplicate if any.<\/span><\/p>\n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>15. What are the ELT Testing Tools you are familiar with?<\/strong><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">DataQ<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Right Data<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Query Surge<\/span><\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>16. What is Data Accuracy testing?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">This type checks whether the data transformed is accurate as expected without any change. The transformed data from the source should match the expectations accurately.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>17. What is Incremental Testing?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">This testing type ensures whether the changes made to the data are in sync with the business model. The insert operation, calculations or delete operations performed on the data is checked for integrity.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>18. What is a constraint validation test case?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">The conditions designed to function the software should be subjected to constraint validation testing. Writing a condition checking test case to match the specific table is the main process in this case.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>19. What are Race condition bugs?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">If the system hangs\/crashes due to any load or memory issues and restricts the user from running their platforms, this is said to be Race Condition bugs.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>20. How will you handle it if the device doesn&#8217;t respond to the application?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">These are the hardware bugs that may occur in a system. To handle these bugs, updating the applications, rolling back the old versions, re-installing the applications may rectify the bugs.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>ETL Testing Interview Questions related to SQL Queries:<\/strong><\/span><\/h2>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><span style=\"font-weight: 400;\">Here are a few sample <\/span><em><span style=\"font-weight: 400;\">testing interview questions<\/span><\/em><span style=\"font-weight: 400;\"> of SQL that include set operators, functions, joins and other functions of SQL.<\/span><\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>21. In what way SQL contributes to ETL Testing?<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Testers usually fetch data from diverse sources. In this process, the data to be collected from various sources should undergo several joins and set functions which are possible in SQL queries.&nbsp;<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>22. What set operators will help in ETL Testing?<\/strong><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Union<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Union All<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Minus<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Intersect&nbsp;<\/span><\/li><\/ul>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">These are the few set operators used in SQL queries.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">23. List the aggregate functions?<\/span><\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Max<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Min<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Sum<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Count<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">Average<\/span><\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>24. Write a query to display the count of employees in a particular department of salary 25000.<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">SELECT COUNT (*) FROM Employee WHERE Department = &#8216;CSE&#8217; and Salary = &#8216;25000&#8217;.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\"><strong>25. Write a query to display the different products purchased by the customer.<\/strong><\/span><\/h3>\n\n\n\n<p><span style=\"font-weight: 400; font-size: 12pt; font-family: verdana, geneva, sans-serif;\">SELECT DISTINCT (ITEM_SOLD) FROM PURCHASE<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion:<\/strong><\/h2>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">We hope that this list of top 25 ETL testing interview questions help you in securing your future job in the digital industry.<\/span><\/p>\n\n\n\n<p><strong>More resources :<\/strong><a href=\"https:\/\/www.monsterindia.com\/career-advice\/software-tester-interview-questions-and-answers\/\"> Software Tester interview questions<\/a> |&nbsp;<a href=\"https:\/\/www.monsterindia.com\/career-advice\/functional-testing-interview-question-and-answers\/\">25 Functional Testing Interview Question and Answers<\/a> | <a href=\"https:\/\/www.monsterindia.com\/career-advice\/top-10-software-testing-interview-questions-and-answers\/\">Top 10 Software Testing Interview Questions and Answers <\/a>|<a href=\"https:\/\/www.monsterindia.com\/career-advice\/top-10-automation-testing-interview-questions\/\">Top 10 Automation Testing Interview Questions<\/a><strong><a href=\"https:\/\/www.monsterindia.com\/career-advice\/top-10-software-testing-interview-questions-and-answers\/\"><br><\/a><\/strong><\/p>\n\n\n\n<p><span style=\"font-size: 12pt; font-family: verdana, geneva, sans-serif;\">&nbsp;<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Among lakhs and lakhs of IT students who graduate in a year, every single graduate will be qualified to bag the Software Tester or ETL Tester job. So all we have to concentrate on is how to stand unique from others to grab the employer&#8217;s attention.&nbsp; Most of the candidates could explain the entire concept [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11312,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[147],"tags":[],"class_list":{"0":"post-11233","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-interview-questions"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/posts\/11233","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/comments?post=11233"}],"version-history":[{"count":3,"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/posts\/11233\/revisions"}],"predecessor-version":[{"id":15845,"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/posts\/11233\/revisions\/15845"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/media\/11312"}],"wp:attachment":[{"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/media?parent=11233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/categories?post=11233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.foundit.in\/career-advice\/wp-json\/wp\/v2\/tags?post=11233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}