# Preparing dataset examples
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You can prepare data in any dataset to make it more suitable for analysis, for example changing a field name or adding a calculated field. For database datasets, you can also determine the data used by specifying a SQL query or joining two or more tables. 

Use the following topics to learn how to prepare datasets.

**Topics**
+ [Preparing a dataset based on file data](prepare-file-data.md)
+ [Preparing a dataset based on Salesforce data](prepare-salesforce-data.md)
+ [Preparing a dataset based on database data](prepare-database-data.md)