ابتدا بانک را باید ببندید وسپس این دستور را بدهیدdataenvironment.rscommand1.Source = "SELECT tabel1.cod, tabel1.name FROM tabel1 WHERE (tabel1.cod = '" + Text1.Text + "')"سپس بانک را باز میکنید این دستور and و or هم میشود داد مانندdataenvironment.rscommand1.Source = "SELECT per.cod, per.name, per.family, works.work, works.bimh, works.mor, works.month, works.sal FROM per INNER JOIN works ON per.cod=works.cod WHERE (((per.cod)=120) AND ((works.month)='ãåÑ') AND ((works.sal)=89))"