結合兩個表 - 數據庫OLEDB

Question

我有兩個表在一個數據庫文件：

第一個表：

clientID firstName middleName lastName contactNum  emailAdd 
200  xxxxx  yyyyyy  zzzzz 00000000 example@yahoo.com 

二表：

employeeID firstName middleName lastName contactNum  emailAdd 
100  xxxxx  yyyyyy  zzzzz 00000000 example@yahoo.com 

我怎樣才能連接呢？

我試過使用InnerJoin，但是數據庫或代碼有問題嗎？

 objComm = New OleDbCommand("SELECT tblClient.clientID, tblLawyer.employeeID FROM tblClient INNER JOIN tblLawyer ON tblClient.clientID = tblLawyer.employeeID", objConn) 
     objAdap = New OleDbDataAdapter(objComm) 
     objAdap.Fill(objDt) 

     If objDt.Rows.Count > 0 Then 
      dgRegister.DataSource = objDt 
      dgRegister.Columns(0).Visible = False 

      objDt = New DataTable 

      objComm = New OleDbCommand("SELECT tblClient.clientID, tblLawyer.employeeID FROM tblClient INNER JOIN tblLawyer ON tblClient.clientID = tblLawyer.employeeID WHERE employeeID=" & dgRegister.Rows(0).Cells(0).Value.ToString(), objConn) 
      objAdap = New OleDbDataAdapter(objComm) 
      objAdap.Fill(objDt) 

      txtFirstName.Text = objDt.Rows(0)(1).ToString() 
      txtMidName.Text = objDt.Rows(0)(2).ToString() 
      txtLstName.Text = objDt.Rows(0)(3).ToString() 
      txtCNumber.Text = objDt.Rows(0)(4).ToString() 
      txtEmail.Text = objDt.Rows(0)(5).ToString() 
      txtPW.Text = objDt.Rows(0)(6).ToString() 
      txtSex.Text = objDt.Rows(0)(7).ToString() 

我試圖在datagridview上顯示它。由於

Answer 1

使用UNION：MySQL數據庫上

SELECT t1.* 
FROM Table1 t1 
UNION ALL 
SELECT t2.* 
FROM Table2 t2