title: 4 TABLES INNER JOIN SQL STATEMENT
body: <p>I have this database structure...</p>
  
  <p><img src="https://i.stack.imgur.com/PCmHW.jpg" alt="database"></p>
  
  <p>(It´s on spanish, hope doesn´t matter) and I made this query using inner join but I don´t get any result so I guess I did something wrong... This is my query...</p>
  
  <pre><code>SELECT TBoleta.NroSerie+'-'+TBoleta.NroBoleta Boleta, TBoleta.Fecha, 
  TAlumno.APaterno+' '+TAlumno.AMaterno+' '+TAlumno.Nombres as Apellidos_y_Nombres, 
  TGrupoModulo.Modulo + ' ' + TGrupoModulo.Seccion + ' ' + TGrupoModulo.Turno,
   TBoleta.Monto  
  
  FROM        TMatricula 
          inner join TAlumno on TMatricula.CodAlumno = TAlumno.CodAlumno
          inner join TBoleta on TBoleta.NroMatricula = TMatricula.NroMatricula
          inner join TGrupoModulo on TGrupoModulo.CodGrupoModulo =    TMatricula.CodGrupoModulo
  </code></pre>
  
  <p>Please... I will appreciate any help. Thanks!</p>