ACC: How to Return Records in a Many-to-Many Relationship

ID: Q106287

The information in this article applies to:

SUMMARY

Novice: Requires knowledge of the user interface on single-user computers.

This article demonstrates how to design a query to return the records from one table in a many-to-many relationship where each of the records returned is related to two records in the other table in the relationship. Note that the many-to-many relationship between the two tables is broken into two one-to-many relationships with a third (junction) table.


MORE INFORMATION

The following steps demonstrate how to create a sample query to return records from one table in a many-to-many relationship:

  1. Open the sample database Northwind.mdb (NWIND.MDB in versions 1.x and 2.0).


  2. Create the following new query based on the Order Details table: 
    
      Query: Test
      ---------------------------------------------------------
      Type: Select Query

      Field Name: OrderID (or Order ID in versions 1.x and 2.0)
         Total: Group By
      Field Name: ProductID (or Product ID in versions 1.x and 2.0)
         Total: Count
         Criteria: >1
      Field Name: ProductID
         Total: Where
         Show: False
         Criteria: 14 Or 21


Note that the use of the criteria "14 or 21" with a "Where" total on the ProductID field returns only those order IDs that contain either one or both of the products. The use of the criteria ">1" with a "Count" total on the same field returns only records with both products.


REFERENCES

For more information about queries, search for "criteria, queries, entering," and then "Enter criteria in a query or advanced filter to retrieve certain records" using the Microsoft Access 97 Help Index. 


Keywords          : GnlApp 
Version           : 1.0 1.1 2.0 7.0 97
Platform          : WINDOWS 
Issue type        : kbhowto

Last Reviewed: March 27, 1999