dbf files in Excel with SQL - sql

Question

Every day i need to make a report for salesman, we have 2 dbf files from witch i automatic want to make the report in Excel. Report from 1 dbf file works perfect, but i don't know how to join 2 dbf files in VBA.
I have to following script:
Option Explicit
Sub ReadDBF()
Dim con As Object
Dim rs As Object
Dim DBFFolder As String
Dim FileName As String
Dim FileName1 As String
Dim sql As String
Dim myValues() As String
Dim i As Integer
Dim j As Integer
Application.ScreenUpdating = False
DBFFolder = ThisWorkbook.Path & "\"
FileName = "project1.dbf"
FileName1 = "project2.dbf"
On Error Resume Next
Set con = CreateObject("ADODB.connection")
If Err.Number <> 0 Then
MsgBox "Connection was not created!", vbCritical, "Connection error"
Exit Sub
End If
On Error GoTo 0
con.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & DBFFolder & ";Extended Properties=dBASE IV;"
sql = "SELECT project_id, COUNT(*) AS total, salesman, MAX(date) AS max_date, projectname FROM " & FileName & FileName1 & " where DateValue(datumtijd) = Date() and FileName.project_id = FileName1.project_id " & "group by project_id, salesman"
On Error Resume Next
Set rs = CreateObject("ADODB.recordset")
If Err.Number <> 0 Then
MsgBox "Connection was not created!", vbCritical, "Connection error"
Exit Sub
End If
On Error GoTo 0
rs.CursorLocation = 3
rs.CursorType = 1
rs.Open sql, con
ReDim myValues(rs.RecordCount, 20)
i = 1
If Not (rs.EOF And rs.BOF) Then
'Go to the first record.
rs.MoveFirst
Do Until rs.EOF = True
myValues(i, 1) = rs!project_id
myValues(i, 2) = rs!salesman
myValues(i, 3) = rs!Total
myValues(i, 4) = rs!max_date
myValues(i, 5) = rs!project
rs.MoveNext
i = i + 1
Loop
Else
rs.Close
con.Close
Set rs = Nothing
Set con = Nothing
Application.ScreenUpdating = True
MsgBox "There are no records in the recordset!", vbCritical, "No Records"
Exit Sub
End If
Sheet1.Activate
For i = 1 To UBound(myValues)
For j = 1 To 4
Cells(i + 1, j) = myValues(i, j)
Next j
Next i
rs.Close
con.Close
Set rs = Nothing
Set con = Nothing
Columns("A:D").EntireColumn.AutoFit
Application.ScreenUpdating = True
MsgBox "The values were read from recordset successfully!", vbInformation, "Done"
End Sub

Answer 1

The query doesn't work just by adding the two tables together as the from source. What is it you are trying to actually get? Also, you should never concatenate strings to build a query. They should always be parameterized.
Now, that said, your syntax is simply incorrect. Your variables are referred to as "FileName" and "FileName1", but the underlying TABLES you are querying from are "Project1" and "Project2" respectively. You should learn about aliases to help simplify queries too, and learn proper JOIN syntax.
By listing the tables one after the other with no comma will cause it to fail. Here is a more accurate syntax and formatted for readability. Then I have edited your original query to match the context. You should also always qualify the field names from the respective table so others trying to help know where things are coming from. In the sample below, I have only GUESSED at which table has which columns by using the alias "P1." and "P2." respectively. You will probably need to change them. Also, since "Date" could be interpreted as a reserved word, I have wrapped it in [], but may need to be changed to tick characters (next to number 1) ``
select
P1.Project_ID,
COUNT(*) as Total,
P1.SalesMan,
MAX( P2.[Date] ) as Max_Date,
P1.ProjectName
from
Project1 P1
JOIN Project2 P2
on P1.Project_ID = P2.Project_ID
where
DateValue( P2.datumtijd ) = date()
group by
P1.Project_ID,
P1.SalesMan
The JOIN clause identifies the relation BETWEEN the two tables on respective columns. The WHERE clause is additional criteria you are looking for.
sql = "SELECT project_id, COUNT(*) AS total, salesman, " & _
"MAX(date) AS max_date, projectname " & _
" FROM " & FileName & " P1 " & _
" JOIN " & FileName1 & " P2 ON P1.Project_ID = P2.Project_ID" & _
" where DateValue(datumtijd) = Date() " & _
" group by project_id, salesman"