mysql - Combining two tables - database OLEDB -


i have 2 tables in 1 database file:

first table:

clientid firstname middlename lastname contactnum       emailadd 200       xxxxx     yyyyyy     zzzzz    00000000    example@yahoo.com

second table:

 employeeid firstname middlename lastname contactnum       emailadd  100       xxxxx     yyyyyy     zzzzz    00000000    example@yahoo.com

how can connect it?

i tried using innerjoin there's wrong database or code? 

        objcomm = new oledbcommand("select tblclient.clientid, tbllawyer.employeeid tblclient inner join tbllawyer on tblclient.clientid = tbllawyer.employeeid", objconn)         objadap = new oledbdataadapter(objcomm)         objadap.fill(objdt)          if objdt.rows.count > 0             dgregister.datasource = objdt             dgregister.columns(0).visible = false              objdt = new datatable              objcomm = new oledbcommand("select tblclient.clientid, tbllawyer.employeeid tblclient inner join tbllawyer on tblclient.clientid = tbllawyer.employeeid 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()

i'm trying display on datagridview. thanks

use union:

select t1.* table1 t1 union select t2.* table2 t2

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