Table: us_congress_successors
Columns: district
vacator
reason_for_change
successor
date_successor_seated

Question: When was successor George E. Harris (R) seated?
SQL: SELECT "date_successor_seated" FROM us_congress_successors WHERE "successor" = 'George E. Harris (R)'

Question: What was the reason for change when the successor was William Milnes, Jr. (C)?
SQL: SELECT "reason_for_change" FROM us_congress_successors WHERE "successor" = 'William Milnes, Jr. (C)'

Question: When were the successor/s seated for Ohio 10th?
SQL: SELECT "date_successor_seated" FROM us_congress_successors WHERE "district" = 'Ohio 10th'

Question: Name the reason for change when George W. Greene (D) was the vacator.
SQL: SELECT "reason_for_change" FROM us_congress_successors WHERE "vacator" = 'George W. Greene (D)'

Question: When was successor David Atwood (R) seated?
SQL: SELECT "date_successor_seated" FROM us_congress_successors WHERE "successor" = 'David Atwood (R)'