How to create a query that has parameters to evaluate complex criteria in Access
Original KB number: 290178
Note
This article applies only to a Microsoft Access database (.mdb or .accdb). Requires basic macro, coding, and interoperability skills.
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 not a Start Date or an End Date, the query returns all orders.
Open the sample database Northwind.mdb.
Create a new query that is based on the Orders table.
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
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
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.
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