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Jun 1, 2024 · Prepare for your data warehouse interview with these 50 questions and answers for fresher and experienced candidates. Learn the basics of data warehousing, business intelligence, data mining, OLTP, OLAP, ETL, and more.
- What is a data warehouse? A data warehouse is a huge store of data accumulated from a broad range of sources within an organization and used to guide business decisions.
- What is a dimensional table? Dimensional tables include textual attributes of measurement saved in the fact tables. A dimensional table is a group of hierarchies, categories, and logic which can be used for the customer to traverse in hierarchy nodes.
- What is a fact table? The fact table includes the measurement of the business process. Fact table includes the foreign keys for the dimension tables.
- What are the different methods of loading dimension tables? There are two different methods to load data in dimension tables: Conventional (slow): All the constraints and keys are validated against the information before, it is loaded, and this method data integrity is maintained.
Jul 31, 2023 · Learn 50 common data warehouse interview questions and answers for beginner and intermediate levels. Topics include data warehouse overview, ETL, dimensional model, data summarization, data mart, fact and dimension tables, and more.
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- What is an aggregate table in a Data warehouse? An aggregate table is a table that contains existing warehouse data grouped to a certain level of dimensions.
- What do you understand by metadata in Data warehouse? Data about the data is called metadata. The metadata includes fixed width and limited width, number of columns used, data types, and fields' ordering.
- Define ER diagram in data warehousing. ER (Entity-Relationship) diagram is a diagram illustrating interrelationships between different entities in a database.
- Name the approaches used by the optimizer during the execution plan. The two approaches used by Optimizer during the execution plan are: Rule-based: It is an old technique of carrying out a query based on certain specific rules.
Mar 3, 2023 · Prepare for your data warehouse interview with 40 common questions and sample answers. Learn about data warehouse types, functions, benefits, skills and more.
Apr 30, 2024 · Learn the top 70+ data warehouse interview questions and answers for 2024, covering topics such as data warehousing concepts, data mining, data transformation, data modeling, and more. Prepare for your data warehouse job interview with this comprehensive guide.
Prepare for your data warehouse interview with this comprehensive guide. It covers data warehouse concepts, types, solutions, modeling, and more for freshers, intermediate, and experienced candidates.
