analyse transaction data, You need to compare payment amounts, times and locations., analyse customer behaviour, You want to understand how customers normally log in and use the app., write SQL queries, You need to get all payments above €500 from the company’s database., use Python for data analysis, You want to use pandas to clean and analyse a file., work with large datasets, Your analysis includes 20 million records., check data quality, Some dates are missing, and several payments appear twice in the table., evaluate external data sources, A provider offers new information about customers. You need to check whether it is useful and reliable.

Working with data

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