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1 Let&"para">The diagram shows all the relationships in the database; all but one are one-to-many relationships. Some of the one-to-many relationships are suitable for display in a main form with one or more subforms (for example, a main form bound to tblCustomers with several subforms bound to tblCustomerPhones, tblCustomerEMails, and tblShippingAddresses). The primary table (tblCustomers) contains data about customers, one record per customer, while the linked tables have (at least potentially) multiple records per customer.
11. html#764" target="_parent" class="chapterjump">Chapter 10, Moving Old Data into the New Database. For this chapter, we have the much simpler task of using the LNC right from the start. For naming the six main database objects, the tags listed in the table below are used. (See Chapter 10 for a more extensive table with more specialized tags for subvarieties of database objects). Object Form Form (dialog) Form (menu) Form (subform) Macro Module Query (any type) Report Table Tag frm fdlg fmnu fsub mcr bas qry rpt tbl For this chapter, only a few form tags are needed.
However, I left the address fields in tblMailingList, so they could be used for personal addresses for persons on the mailing list who are using their own addresses rather than company addresses. Fourth Normal Form: Isolate Independent Multiple Relationships In a database with many-to-many relationships, don’t add irrelevant fields to the linking table that connects the two “many” tables. In a student records database, for example, using a many-to-many relationship between Students and Classes, with a linking table tblStudentClasses, you might have a Semester and Year field, indicating that a particular student took a particular class in a specific semester and year.