Table: league_manager_changes_5
Columns: team
outgoing_manager
manner_of_departure
date_of_vacancy
replaced_by
date_of_appointment
position_in_table

Question: When was the date of appointment by Hugo Broos?
SQL: SELECT "date_of_appointment" FROM league_manager_changes_5 WHERE "replaced_by" = 'Hugo Broos'

Question: How many times did outgoing manager Bart de Roover vacated a position?
SQL: SELECT COUNT("date_of_vacancy") FROM league_manager_changes_5 WHERE "outgoing_manager" = 'Bart De Roover'

Question: Who was the outgoing manager of the team in 15th position that was sacked?
SQL: SELECT "outgoing_manager" FROM league_manager_changes_5 WHERE "manner_of_departure" = 'Sacked' AND "position_in_table" = '15th'

Question: What was the team's position in table when Danny OST was the outgoing manager?
SQL: SELECT "position_in_table" FROM league_manager_changes_5 WHERE "outgoing_manager" = 'Danny Ost'