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Defines the source's "base" table. This is the name of a report builder table that the source is based on. Your choice will determine the contents of the report. In this case, because we are creating a report on courses, the course table is the most obvious choice for base table. It is also possible to use a sub-query as a base table although you need to make sure the sub-query defines a unique field called 'id' as this is used as the default field for sorting.
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