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How do you assign forign keys in Access 2007

Posted on 2009-05-11
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having trouble assigning forign keys
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Question by:1030071002
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geowrian earned 75 total points
ID: 24361066
In a nutshell, you have a primary key from table x and the foreign key in table y. Make sure the types are compatible (i.e. an autonumber in table x with a long integer in table y). That's basically it. Depending on the indexing options you select on the foreign key, the type of relationship will change (i.e. indexing: yes with duplicates allowed will create a many-to-one relationship).

To enforce referential integrity (as is often what people are looking for with access databases from my experience):
1) Right-click off a table and choose "Relationships".
2) Add tables x and y to the view, if they are not already there.
3) Drag the primary key in table x to the foreign key in table y
4) Check enforce referential integrity and the cascading options you need.
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by:Scott McDaniel (Microsoft Access MVP - EE MVE )
Scott McDaniel (Microsoft Access MVP - EE MVE ) earned 75 total points
ID: 24363591
Access can handle most of the heavy lifting, if you setup your tables as geowrian describes. For example, most of the time in Access a foreign key relationship is handled through either (a) a combo or listbox or (b) a subform. If you use a combo/listbox, then you simply set the ControlSource of that control to the field in your table that would house the foreign key value, and you'd set the RowSource of the control to show the records from the foreign table.

If you use a Subform, you'd set the Master/Child links to reflect the relationship between those two tables, with your Master being the "one" side of the 1-to-Many relationship, and the Child (i.e. subform) being the "Many" side of that relationship.
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