Can i Force to postgrsql to use a certain index?

Hi every body

 it is possible to force to postgresql to use a certain index? I know that in mysql exits Force index (index_name) option for select queries
SELECT * FROM precalc FORCE INDEX (hladrb50101) ;

any of you have used this?

thanks

pau

--
Pau Marc Muñoz Torres

Laboratori de Biologia Computacional  
Institut de  Biotecnologia   i Biomedicina Vicent Villar                                    
Universitat Autonoma de Barcelona
E-08193 Bellaterra (Barcelona)
              
telèfon: 93 5812807
Email : paumarc.munoz@bioinf.uab.cat