How to create a query that has parameters to evaluate complex criteria in Microsoft Access

This article applies only to a Microsoft Access database (.mdb or .accdb).

Moderate: Requires basic macro, coding, and interoperability skills.

For a Microsoft Access 2000 version of this article, see
209250 .
For a Microsoft Access 97 version of this article, see
103252 .

Summary

In Microsoft Access, you can use variable parameters in queries. This article discusses how to construct a query that requires more than one prompt. You can use each parameter both as criteria and as a field to allow complicated evaluation of the value that is entered in each parameter.

More Information

CAUTION: If you follow the steps in this example, you modify the sample database Northwind.mdb. You may want to back up the Northwind.mdb file and follow these steps on a copy of the database.

The following parameter query is based on the Orders table in the sample database Northwind.mdb. It selects orders written between two dates provided by the user.

If the user does not enter either the Start Date or the End Date, the query returns all dates greater than or equal to the Start Date, or less than or equal to the End Date. If the user enters neither a Start Date nor an End Date, the query returns all orders.
  1. Open the sample database Northwind.mdb.
  2. Create a new query that is based on the Orders table.
  3. Enter the following query:

    Query: FindOrdersByDate
    ---------------------------------------------------------
    Type: Select Query

    Field: OrderID
    Show: Yes

    Field: OrderDate
    Sort: Ascending
    Show: Yes
    First Criteria Line: Between [Start Date] and [End Date]
    Second Criteria Line: <=[End Date]
    Third Criteria Line: >=[Start Date]

    Field: [Start Date]
    Show: No
    First Criteria Line: Is Not Null
    Second Criteria Line: Is Null
    Third Criteria Line: Is Not Null
    Fourth Criteria Line: Is Null

    Field: [End Date]
    Show: No
    First Criteria Line: Is Not Null
    Second Criteria Line: Is Not Null
    Third Criteria Line: Is Null
    Fourth Criteria Line: Is Null
  4. In Microsoft Office Access 2003 or Microsoft Access 2002, on the Query menu, click Parameters. In Microsoft Office Access 2007, click the Design tab, and then click Parameters in the Show/Hide group. In the Query Parameters dialog box, add two entries, one for each parameter in the query, as follows:

    Query Parameters
    -----------------------
    Parameter: Start Date
    Data Type: Date/Time

    Parameter: End Date
    Data Type: Date/Time
  5. In Access 2003 or in Access 2002, click Datasheet on the View menu to run the query. In Access 2007, click the Design tab, and then click Datasheet View in the View list in the
    Results group to run the query.

    Note Access prompts you for the value of the parameters. Then, Access substitutes the proper values in the query.
Vlastnosti

ID článku: 290178 – Posledná kontrola: 30. 10. 2008 – Revízia: 1

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