The ________ step in ETL involves the extraction of data from various sources.
- Extraction
- Loading
- Staging
- Transformation
The Extraction step in the ETL process involves pulling data from various sources such as databases, flat files, or APIs. This data is then prepared for further processing in the ETL pipeline.
What role does 'data mart' play within a larger data warehousing strategy?
- It is a subset of a data warehouse, focusing on specific business functions or user groups.
- It is an alternative term for a data warehouse.
- It is only used for storing historical data.
- It serves as the central repository for all organizational data.
A 'data mart' is a subset of a data warehouse, designed to serve the specific needs of a particular business function or user group. It allows for a more targeted approach to data analysis and reporting within a larger data warehousing strategy.
f you need to continuously monitor and update data from a social media platform, which API feature should be your focus?
- OAuth Authentication
- Rate Limiting
- Swagger Documentation
- Webhooks
Webhooks allow real-time data updates by triggering events when there are changes on the social media platform. Rate Limiting is more related to controlling the number of requests, OAuth Authentication is for secure authorization, and Swagger Documentation is a tool for API documentation.
The process of transforming raw data into meaningful insights using BI tools is known as _________.
- Business Intelligence
- Data Analysis
- Data Mining
- Data Transformation
The process of transforming raw data into meaningful insights using BI tools is known as Business Intelligence (BI). This involves various activities, including data extraction, transformation, loading, analysis, and visualization, to derive valuable insights for decision-making. Data Analysis and Data Mining are components of BI, while Data Transformation is a specific step within the BI process.
Cloud-based analytics platforms often use _______ technology to provide real-time data processing and analytics.
- Batch
- Distributed
- Parallel
- Streaming
Cloud-based analytics platforms often leverage streaming technology to process and analyze data in real-time, allowing for timely insights and decision-making. Streaming technology enables the continuous flow of data for immediate processing.
How does a DBMS ensure data integrity?
- By allowing concurrent access to data
- By compressing data to save space
- By enforcing constraints such as primary keys and foreign keys
- By storing data in a single flat file
Data integrity in a DBMS is ensured by enforcing constraints like primary keys and foreign keys. These constraints maintain the accuracy and consistency of data by preventing invalid or inconsistent entries.
In graph theory, what algorithm is used to find the minimum spanning tree for a connected weighted graph?
- Bellman-Ford Algorithm
- Dijkstra's Algorithm
- Kruskal's Algorithm
- Prim's Algorithm
Prim's Algorithm is used to find the minimum spanning tree for a connected weighted graph. It starts with an arbitrary node and greedily adds the shortest edge that connects a vertex in the tree to a vertex outside the tree until all vertices are included.
In the healthcare sector, which data mining method would be optimal for predicting patient readmission risks?
- Association Rule Mining
- Classification
- Clustering
- Regression
Classification is optimal for predicting patient readmission risks in healthcare. It involves categorizing patients into different classes, such as high or low risk, based on relevant features. Regression, Association Rule Mining, and Clustering are not as suitable for this specific predictive task.
What function would you use to combine text from two different cells into one cell?
- COMBINE
- CONCATENATE
- JOIN
- MERGE
The CONCATENATE function is used to combine text from two or more cells into a single cell in Excel. It allows you to concatenate, or join, the contents of different cells.
In statistics, what does the median represent in a data set?
- The middle value in a sorted list
- The most frequently occurring value
- The range of values
- The sum of all values divided by the number of values
The median is the middle value in a sorted list. It is not affected by extreme values and provides a measure of central tendency.
If you need to extract data from multiple tables based on a set of complex conditions, which SQL feature would you primarily use?
- GROUP BY
- HAVING
- JOIN
- UNION
In scenarios where data needs to be extracted from multiple tables based on complex conditions, the JOIN operation is commonly used in SQL. JOIN allows you to combine rows from two or more tables based on a related column between them.
Which role is typically responsible for defining and enforcing data quality standards?
- Chief Information Officer (CIO)
- Data Analyst
- Data Steward
- Database Administrator
The role typically responsible for defining and enforcing data quality standards is the Data Steward. Data Stewards play a key role in ensuring that data is accurate, consistent, and meets the organization's quality requirements.