Table: congress_changes_4
Columns: district
vacator
reason_for_change
successor
date_successor_seated

Question: what is the date the successor seated because the person died august 17, 1954?
SQL: SELECT "date_successor_seated" FROM congress_changes_4 WHERE "reason_for_change" = 'Died August 17, 1954'

Question: who was the successor for district ohio 15th?
SQL: SELECT "successor" FROM congress_changes_4 WHERE "district" = 'Ohio 15th'

Question: what is the total number for reason for change is district michigan 3rd?
SQL: SELECT COUNT("reason_for_change") FROM congress_changes_4 WHERE "district" = 'Michigan 3rd'