A sub-form is an additional component of the main form. The main form can be called the &quot; parent form &quot; or &quot; master &quot; . Sub-forms are needed as soon as you want to access more than one table from a form. Each additional table requires its own sub-form. After creating a form, it can be changed into a sub-form.
子窗体是主窗体的附加组件。主窗体称为“父窗体”或“主窗体”。要从一个窗体访问多个表格就需要用到子窗体。每个其他表格都需要一个自己的子窗体。