'AND' in WHERE clauses - Mailing list pgsql-novice

Sometimes I get a bit confused with my AND and OR clauses in WHERE statements. When I'm working with big data I often think it's done one thing and find later it's done another. Given this, would someone just glance at this for me please?  Will this only set the_geom in the condition that ALL of my WHERE clauses are satisfied?  ( I hope so)

UPDATE stage SET the_geom = st_setsrid(st_makeline(st_makepoint(soose::integer, soosn::integer), st_makepoint(sdose::integer, sdosn::integer)),27700) WHERE sdurn::numeric = 0 AND bad_flag IS NULL AND smode5y = '1'  AND st_length(st_makeline(st_makepoint(soose::integer, soosn::integer), st_makepoint(sdose::integer, sdosn::integer))) < 60;

Thanks

James