Microsoft KB Archive/147724

= How to use TOP N query from Microsoft Access 2.0 in VB =

Article ID: 147724

Article Last Modified on 4/1/2005

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APPLIES TO


 * Microsoft Visual Basic 5.0 Professional Edition
 * Microsoft Visual Basic 6.0 Professional Edition
 * Microsoft Visual Basic 5.0 Enterprise Edition
 * Microsoft Visual Basic 6.0 Enterprise Edition
 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 4.0 16-bit Enterprise Edition
 * Microsoft Visual Basic 4.0 32-Bit Enterprise Edition
 * Microsoft Access 2.0 Standard Edition

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This article was previously published under Q147724



SUMMARY
One of the new types of queries added to Microsoft Access version 2.0 for Windows is called a TOP N query. If you have Microsoft Access version 2.0 or higher, and Microsoft Visual Basic for Windows version 4.0 and higher, you can use this type of query from Visual Basic version 4.0 programs.

This article gives a brief example that uses both the Access TOP N and TOP N PERCENT queries from Visual Basic.



MORE INFORMATION
For more information on these particular queries, please review the Microsoft Access documentation.

Step-by-Step Example
 Start a new project in Visual Basic. Form1 is created by default. Add three Labels, three List Box controls, and three Command buttons to Form1.  Using the following table as a guide, set the properties of the controls you added in step 2:   Control Name   Property       New Value

Label1        Caption        Selecting the first 10 titles from the Titles table according to title field. Label2        Caption        Selecting the first 5 titles from the Titles table according to date published. Label3        Caption        Selecting the first 7 years of percent published from the Titles table according to the year published field. Command1      Caption        First 10 Title names. Command2      Caption        First 5 titles dates published. Command3      Caption        First 7 years percent published.   Place the following code in the Command1 Click event procedure: Private Sub Command1_Click Dim ds As Recordset Dim db As database

Set db = Workspaces(0).OpenDatabase("BIBLIO.MDB") Set ds = _ db.OpenRecordset("select top 5 title from titles order by title")

Do Until ds.EOF list1.AddItem "" & ds("title") ds.MoveNext Loop ds.Close db.Close End Sub   Place the following code in the Command2 Click event procedure: Private Sub Command2_Click Dim ds As Recordset Dim db As database

Set db = Workspaces(0).OpenDatabase("BIBLIO.MDB") Set ds = db.OpenRecordset("select top 5 [year published], _        title from titles order by [year published]")

Do Until ds.EOF list2.AddItem "" & ds("title") ds.MoveNext Loop ds.Close db.Close End Sub   Place the following code in the Command3 Click event procedure: Private Sub Command3_Click Dim ds As Recordset Dim db As database

Set db = Workspaces(0).OpenDatabase("BIBLIO.MDB") Set ds = db.OpenRecordset("select top 7 Percent [year published], _        title from titles order by [year published]")

Do Until ds.EOF list3.AddItem "" & ds("title") ds.MoveNext Loop ds.Close db.Close End Sub </li> On the Run menu, click Start (ALT, R, S), or press the F5 key to run the program. Click each of the buttons (Command1, Command2, and Command3) in succession.</li></ol>

Additional query words: kbVBp400 kbVBp500 kbVBp600 kbdse kbDSupport kbVBp

Keywords: kbhowto KB147724

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