Table: successor_changes
Columns: district
vacator
reason_for_change
successor
date_successor_seated

Question: Who are all successors when reason for change is died May 12, 1964?
SQL: SELECT "successor" FROM successor_changes WHERE "reason_for_change" = 'Died May 12, 1964'

Question: What is every district for reason for change is died August 9, 1964?
SQL: SELECT "district" FROM successor_changes WHERE "reason_for_change" = 'Died August 9, 1964'