Instruction: Describe a detailed workflow where data from multiple sources needs to be imported, cleaned, and transformed using Power Query. Include the types of data transformations you would apply.
Context: This question evaluates the candidate's proficiency with Excel’s Power Query tool, focusing on their ability to automate repetitive data preparation tasks. It reflects on their understanding of integrating and optimizing data from diverse sources, which is crucial for effective data analysis and decision-making in tech roles.