- What are the fundamental components of a data model?
- Can you explain the difference between an entity and a relation in data modelling?
- What is business analysis, and how does it relate to data analysis?
- Can you describe a few popular business analysis frameworks that you've used before?
- What is SQL, and how is it used in data analysis?
- What are some common SQL commands that you've used before in data analysis?
- How do you write a basic SQL query to retrieve data from a database?
- Can you explain the difference between inner join and outer join in SQL?
- How would you find the correlation between two variables in a dataset?
- Can you describe some popular correlation measures that are used in data analysis?
- How would you calculate the rank of a particular data point within a dataset?
- What are some popular ranking functions that are used in data analysis?
- How would you calculate the mean and standard deviation of a dataset using SQL?
- Can you explain the difference between a sample and a population in statistics?
- How would you calculate the mode and median of a dataset using SQL?
- How would you use Excel to visualize data using charts and graphs?
- What are some popular chart and graph types that are used in data analysis?
- How would you create a pivot table in Excel, and what is it used for?
- Can you explain the difference between a scatter plot and a bar graph?
- Can you explain the difference between positive and negative correlation in data analysis, and what are some examples of each?
- How would you use Excel to sort data based on a particular column?
- Can you explain the concept of percentile rank in statistics, and how is it used in data analysis?
- How would you calculate the percentage change between two values in a dataset using Excel?
- Can you explain the difference between mean and median, and when might you use each one in data analysis?
- How would you use Excel to create a simple bar chart, and what are some common settings that you can adjust?
- Can you explain the difference between a line chart and a scatter plot, and when might you use each one in data analysis?
- How would you use Excel to calculate the total sales for a particular product category?
- Can you explain the concept of variance in statistics, and how is it used in data analysis?
- How would you use Excel to calculate the standard deviation for a dataset?

- How would you design a data model for a simple e-commerce website that sells products to customers?
- Can you explain the concept of data normalization and its importance in data modelling?
- How would you choose a data storage solution for a particular type of data?
- What are some popular data storage technologies that you've worked with before?
- How do you optimize a SQL query for performance, and what are some common techniques for doing so?
- How would you use SQL to join multiple tables together, and what are some common pitfalls to avoid?
- Can you explain the concept of a subquery in SQL, and when might you use one?
- How do you write an SQL query to group data by a particular field, and what are some common grouping functions?
- Can you explain the difference between covariance and correlation in statistics, and how might you use each one?
- How would you calculate the correlation between multiple variables in a dataset?
- Can you explain the concept of outlier detection in data analysis, and what are some popular techniques for doing so?
- How would you calculate the z-score for a particular data point in a dataset, and what is it used for?
- Can you explain the difference between a histogram and a box plot, and how might you use each one?
- How would you use Excel to perform time-series analysis on a dataset?
- Can you explain the concept of exponential smoothing and how it is used in time-series analysis?
- How would you use Excel to perform regression analysis on a dataset?
- Can you explain the difference between simple linear regression and multiple linear regression, and when might you use each one?
- How would you use Excel to perform clustering analysis on a dataset, and what is it used for?
- Can you explain the difference between k-means clustering and hierarchical clustering, and when might you use each one?
- How would you use Excel to perform text analysis on a dataset, and what are some common techniques for doing so?
- Can you explain the concept of correlation matrix in data analysis, and how is it used to identify patterns in data?
- How would you use Excel to perform conditional aggregation on a dataset, and what are some common conditions that you can use?
- Can you explain the concept of hypothesis testing in statistics, and how is it used to validate assumptions in data analysis?
- How would you use Excel to create a pivot chart, and what are some common settings that you can adjust?
- Can you explain the difference between linear regression and logistic regression, and when might you use each one in data analysis?
- How would you use Excel to perform data filtering on a large dataset, and what are some common filter types?
- Can you explain the concept of time-series decomposition, and how is it used in data analysis?
- How would you use Excel to create a stacked bar chart, and what are some common settings that you can adjust?
- Can you explain the concept of cluster analysis, and how is it used to group data points together based on similarity?

- How would you use Excel to create a box-and-whisker plot, and what are some common settings that you can adjust?
- How would you design a data model for a large-scale social media platform that allows users to create and share content?
- Can you explain the concept of dimensional modelling, and how is it used in data analysis?
- How would you choose a data storage and processing architecture for a big data project?
- Can you explain the difference between structured and unstructured data, and what are some popular tools for working with each type?
- How would you use SQL to perform time-based analysis on a dataset with billions of rows?
- How would you use SQL to perform graph analysis on a dataset with billions of nodes and edges?
- Can you explain the concept of a data warehouse, and how is it different from a traditional database?
- How would you use SQL to perform window functions on a dataset, and what are some common window functions?
- How would you use Excel to perform Monte Carlo simulations on a dataset, and what are some popular applications of Monte Carlo simulations in data analysis?
- Can you explain the concept of a decision tree, and how is it used in data analysis?
- How would you use Excel to perform association rule mining on a dataset, and what is it used for?
- Can you explain the concept of natural language processing (NLP), and how is it used in data analysis?
- How would you use Python to perform sentiment analysis on a dataset of customer reviews?
- Can you explain the concept of deep learning, and how is it used in data analysis?
- How would you use Python to perform image recognition on a large dataset of images?
- How would you use Python to perform anomaly detection on a dataset of network traffic?
- Can you explain the difference between supervised and unsupervised learning, and when might you use each one?
- How would you use Python to perform reinforcement learning on a dataset of stock market data?
- Can you explain the concept of a data lake, and how is it different from a data warehouse?
- How would you use Python to perform time-series forecasting on a dataset of sales data?
- How would you use Python to perform multivariate regression on a dataset with hundreds of variables?
- Can you explain the concept of principal component analysis (PCA), and how is it used to reduce the dimensionality of data?
- How would you use Excel to create a heat map, and what are some common settings that you can adjust?
- Can you explain the concept of neural networks, and how is it used to model complex relationships in data?
- How would you use Python to perform time-series analysis on a dataset with missing values?
- Can you explain the concept of feature selection, and how is it used to identify the most important variables in a dataset?
- How would you use Excel to create a waterfall chart, and what are some common settings that you can adjust?
- Can you explain the concept of support vector machines (SVMs), and how is it used to classify data points into different categories?
- How would you use Python to perform unsupervised learning on a dataset with millions of rows?
- Can you explain the concept of ensemble learning, and how is it used to improve the accuracy of predictions in data analysis?