When executing a, b = 10, 20; print(____) to swap and print a and b, the output is 20, 10.
- a
- a, b
- b
- b, a
The correct syntax to swap the values of variables a and b is b, a = a, b. This statement exchanges the values of a and b, resulting in the output 20, 10.
In the context of cloud computing, what advanced technology is often integrated with big data platforms for predictive analytics?
- Blockchain
- Internet of Things (IoT)
- Machine Learning
- Virtualization
Machine Learning is often integrated with big data platforms in the cloud for predictive analytics. It enables the systems to learn patterns from large datasets and make predictions, enhancing data analysis capabilities.
_________ in Tableau provides a powerful way to create complex calculations and data transformations.
- Aggregation
- Calculated Field
- Dashboard
- Data Blending
The Calculated Field feature in Tableau allows users to create custom calculations based on existing fields. It is powerful for creating complex calculations and transforming data within Tableau.
The process of _______ in data-driven decision making involves understanding the hidden patterns and relationships in large datasets.
- Data Cleaning
- Data Exploration
- Data Integration
- Data Pattern Recognition
The process of data pattern recognition in data-driven decision making involves uncovering hidden patterns and relationships in large datasets. This step is essential for gaining insights and making informed decisions based on the data.
What is the primary function of a Database Management System (DBMS)?
- Calculate complex mathematical operations
- Control external hardware devices
- Display data on the screen
- Store and manage data
The primary function of a DBMS is to store and manage data efficiently. It provides a systematic way to organize, retrieve, and manipulate data, ensuring data integrity and security.
For a recommendation system in an e-commerce platform, which machine learning technique would be most effective?
- Collaborative Filtering
- Decision Trees
- Linear Regression
- Naive Bayes
Collaborative filtering is commonly used in recommendation systems as it leverages user behavior and preferences to make personalized recommendations. Decision trees, linear regression, and Naive Bayes are not as well-suited for this task as they do not inherently capture user-item interactions for recommendations.
_______ decomposition breaks a time series into systematic and unsystematic components.
- Additive
- Multiplicative
- Seasonal
- Trend
Multiplicative decomposition is used when the variations in a time series exhibit proportional behavior. It breaks down the time series into systematic (trend, seasonal) and unsystematic (remainder) components.
In deep learning, what function do convolutional layers primarily serve?
- Dimensionality reduction
- Feature extraction from input data
- Non-linear activation
- Weight initialization
Convolutional layers in deep learning primarily serve the purpose of feature extraction from input data. They apply filters to input data, capturing spatial hierarchies of features, which is crucial for tasks like image recognition.
In a binary tree, the _________ traversal method visits the left subtree, the root, and then the right subtree sequentially.
- Inorder
- Level Order
- Postorder
- Preorder
In a binary tree, the Inorder traversal method visits the left subtree, then the root, and finally the right subtree sequentially. This traversal is commonly used for expressions involving binary operators, among other applications.
How would you write a SQL query to find the second highest salary from a table?
- SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees);
- SELECT TOP 2 salary FROM employees ORDER BY salary DESC;
- SELECT salary FROM employees ORDER BY salary DESC LIMIT 1 OFFSET 1;
- SELECT salary FROM employees ORDER BY salary DESC LIMIT 1, 1;
To find the second highest salary, you can use the ORDER BY clause in descending order and apply LIMIT with an offset of 1 to retrieve the second highest salary from the table.