Q1. What is dimensional modelling in a Data Warehouse (i.e. DWH)?
A1. A dimensional model is a data structure technique optimised for Data Warehousing tools (i.e. OLAP products). The concept of Dimensional Modelling is comprised of Fact and Dimension tables.
A “Fact” is a numeric value (i.e. aka a measure) that a business wishes to count or sum.…
This extends Q1 to Q5 at 13 Data Warehouse interview Q&As – Fact Vs Dimension, CDC, SCD, etc – part 1. Q6. What is a Factless Fact table? A6. From…
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs
Q1. What is data backfilling? A1. Backfilling data is a process of reactively processing any missing data for a past time window. Q2. Why do you need to backfill data?…
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs
Prerequisite: Extends Databricks getting started – Spark, Shell, SQL.
SCD stands for Slowly Changing Dimension, and it was explained in 10 Data warehouse interview Q&As.
Step 1: Remove all cells in the notebook with the “x” and then confirm or create a new Python notebook.…
Prerequisite: Extends 03: Databricks – Spark SCD Type 1. What is SCD Type 2 SCD stands for Slowly Changing Dimension, and it was explained in 10 Data warehouse interview Q&As….
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs
Prerequisite: Extends 03: Databricks – Spark SCD Type 1. What is SCD Type 1 SCD stands for Slowly Changing Dimension, and it was explained in 10 Data warehouse interview Q&As….
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs
Prerequisite:…
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs
Q37. What is a Data Lake? A37. A data lake is a storage repository that holds a vast amount of structured, semi-structured, and unstructured raw data in its native format…
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs
Q01. Can you describe a business domain of a Telecom company offering multiple services to its customers? A01. A Telecom company will have entities such as Customer, Account, Subscriptions &…
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs
Q1. What is a Slowly Changing Dimension (i.e. SCD)? A1. SCD means the dimensions that change slowly over time, rather than changing on regular basis. For example, change in customer…
Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs