At the time for defining Data Fetcher, the data usually comes from different data tables. Those tables need to have some kinds of relationships among them. Those kinds of relationships we called 'table join'. The data tables are linked by their 'key'; the result of those links is to create a new data table that contains all data we requested.
The table relationship that ExcelServer supported is Inner Join
Note:
ExcelServer system will automatically link the data tables within a same report template.