SQL: update taxonimportance set cover=null, inferencearea = -1 where cover=-1 and taxonobservation_ID in (select taxonobservation_ID from taxonobservation, observation where taxonobservation.taxonobservation_ID=taxonimportance.taxonobservation_ID AND taxonobservation.observation_ID=observation .observation_ID and project_ID in (1215,505,1592,1911,947,715,811,1225,455,454,1956,1604,1603,1312));