A subform is a form within a form. The primary form is called the main form, and the form within
the form is called the subform. Subforms are especially useful when you want to show data from
tables or queries with a one-to-many relationship.
The main form represents the one side of the one-to-many relationship and the subform represents
the many side. When viewing a record in the main form, the subform displays the related records
from the table on the many side of the relationship. For example, a main form would show
information for each Student, and the subform would show the subject marks each participant
scored.
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