duplicates

来源： https://stackoverflow.com/questions/39605846/dedup-elasticsearch-results-using-multiple-fields-as-unique-key

来源： https://stackoverflow.com/questions/39605846/dedup-elasticsearch-results-using-multiple-fields-as-unique-key

来源： https://stackoverflow.com/questions/39605846/dedup-elasticsearch-results-using-multiple-fields-as-unique-key

来源： https://stackoverflow.com/questions/38813048/find-duplicate-files-in-a-directory-using-linq

来源： https://stackoverflow.com/questions/38813048/find-duplicate-files-in-a-directory-using-linq

来源： https://stackoverflow.com/questions/32918506/pandas-how-to-filter-for-items-that-occur-more-than-once-in-a-dataframe

来源： https://stackoverflow.com/questions/32918506/pandas-how-to-filter-for-items-that-occur-more-than-once-in-a-dataframe

来源： https://stackoverflow.com/questions/18383384/python-copy-files-to-a-new-directory-and-rename-if-file-name-already-exists

来源： https://stackoverflow.com/questions/18383384/python-copy-files-to-a-new-directory-and-rename-if-file-name-already-exists

问题 I am trying to delete duplicates in Postgres. I am using this as the base of my query: DELETE FROM case_file as p WHERE EXISTS ( SELECT FROM case_file as p1 WHERE p1.serial_no = p.serial_no AND p1.cfh_status_dt < p.cfh_status_dt ); It works well, except that when the dates cfh_status_dt are equal then neither of the records are removed. For rows that have the same serial_no and the date is the same, I would like to keep the one that has a registration_no (if any do, this column also has NULLS