Indexes can significantly improve query performance by providing a quick lookup mechanism. Increasing RAM and optimizing hardware resources may help, but they are not as directly related to query optimization as using indexes. Subqueries, while powerful, might not always be the most effective solution for large datasets.

Change Management should be the approach for ensuring successful implementation and adoption of new technologies during digital transformation. It involves planning, communicating, and managing the change process to ensure that employees and stakeholders embrace the new technologies. Six Sigma, Kaizen, and Lean Manufacturing focus on process improvement and may not directly address the challenges of organizational change during digital transformation.

The correct command is 'git merge.' This command combines changes from one branch into another. 'git combine' and 'git push' have different purposes, and 'git branch' is used for creating or listing branches.

The primary function of a data warehouse in business intelligence is to collect, store, and analyze historical data. This enables organizations to gain insights into trends, patterns, and performance over time, supporting informed decision-making.

The primary purpose of using visual aids like charts and graphs is to enhance data visualization. These tools help make complex information more understandable, allowing the audience to grasp insights quickly and effectively.

Stakeholder analysis is crucial in understanding the impact of a data project on different stakeholders. It helps in effective communication, managing expectations, and ensuring that the project aligns with organizational goals. It is not primarily focused on risk identification or hardware requirements.

In dplyr, the correct function for summarizing data, such as calculating the mean of a column, is summarize(). The alternative spelling summarise() is also accepted. summary() is a base R function used for statistical summaries, and stat() is not a valid function in this context.

Serverless services in cloud computing eliminate the need for managing physical hardware. They allow for the analysis of large datasets without the burden of infrastructure management, making it easier to scale and focus on application logic.

For maximizing scalability and minimizing infrastructure management, the company should choose PaaS. With PaaS, the cloud provider manages the underlying infrastructure, allowing the company to focus on developing and deploying applications.

Game Theory is an advanced technique used for problem-solving in situations with multiple stakeholders and conflicting interests. It models strategic interactions between different parties to find optimal solutions. Linear Regression, Hypothesis Testing, and Cluster Analysis are techniques for other aspects of data analysis.