用VBA实现随机选择记录

时　间:2017-10-31 15:55:24
作　者:Big Young   ID：252  城市：襄阳
摘　要:用VBA通过创建一个临时表，实现随机选取记录。
正　文:

用VBA通过创建一个临时表，实现随机选取记录。

Sub PickRandom()

    Dim db As DAO.Database
    Dim tdf As DAO.TableDef
    Dim fld As DAO.Field
    Dim rst As DAO.Recordset
    Dim strSQL As String
    Dim strTableName As String
    
    strSQL = "Select tblStaff.Firstname, tblStaff.Lastname " & _
             "INTO tblTemp " & _
             "FROM tblStaff;"
    DoCmd.SetWarnings False
    DoCmd.RunSQL strSQL
    DoCmd.SetWarnings True
    
    Set db = CurrentDb()
    Set tdf = db.TableDefs("tblTemp")
    Set fld = tdf.CreateField("RandomNumber", dbDouble)
    
    tdf.Fields.Append fld


    Set rst = db.OpenRecordset("tblTemp", dbOpenTable)
    
    rst.MoveFirst
    Do
        Randomize
        rst.Edit
            rst![RandomNumber] = Rnd()
        rst.Update
        rst.MoveNext
    Loop Until rst.EOF
    
    rst.Close
    Set rst = Nothing
    
    strTableName = "tblRandom_" & Format(Date, "ddmmmyyyy")
    strSQL = "Select TOP 25 tblTemp.Firstname, tblTemp.Lastname " & _
             "INTO " & strTableName & " " & _
             "FROM tblTemp " & _
             "ORDER BY tblTemp.RandomNumber;"
    DoCmd.SetWarnings False
    DoCmd.RunSQL strSQL
    DoCmd.SetWarnings True


    db.TableDefs.Delete ("tblTemp")
End Sub


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