问题 While running the below code i get an error saying invalid input syntax for type timestamp from admission_datetime. UPDATE ccsm.stg_demographics_baseline SET xx_los_days = (CASE WHEN admission_datetime IS NULL OR date_trunc('day',admission_datetime) = '' THEN NULL WHEN discharge_datetime IS NULL OR date_trunc('day',discharge_datetime) = '' THEN date_diff('day', admission_datetime, CURRENT_DATE) ELSE date_diff('day', admission_datetime, discharge_datetime) END); enter code here 回答1: See date