Código SQL [-] Select O.Concepto, D1.Nombre, D2.NOmbre, D3.Nombre From Obra O join Director D1 on O.Director1=D1.COdigo join Director D2 on O.Director2=D2.Codigo join Director D3 on O.Director3=D3.Codigo
Select O.Concepto, D1.Nombre, D2.NOmbre, D3.Nombre From Obra O join Director D1 on O.Director1=D1.COdigo join Director D2 on O.Director2=D2.Codigo join Director D3 on O.Director3=D3.Codigo