Final answer:
Tableau uses data blending to let users join data sources with inconsistent field names. It automatically matches similar fields and allows users to manually specify matching fields using aliases.
Step-by-step explanation:
Tableau allows users to join data sources with inconsistent field names using a feature called data blending. Data blending is a technique that enables users to combine data from different sources on a single worksheet. When blending data, Tableau automatically tries to match similar fields across different data sources based on their names and data types. If the field names are inconsistent between the data sources, users can manually specify the matching fields using aliases to ensure accurate data blending.