Table: league_manager_changes
Columns: team
outgoing_manager
manner_of_departure
date_of_vacancy
replaced_by
date_of_appointment

Question: Who replaced the outgoing manager Hüsnü Özkara? 
SQL: SELECT "replaced_by" FROM league_manager_changes WHERE "outgoing_manager" = 'Hüsnü Özkara'

Question: When was the date of vacancy for the manager of Kartalspor? 
SQL: SELECT "date_of_vacancy" FROM league_manager_changes WHERE "team" = 'Kartalspor'

Question: Who replaced the manager of Akhisar B.G.S.?
SQL: SELECT "replaced_by" FROM league_manager_changes WHERE "team" = 'Akhisar B.G.S.'

Question: Which team replaced their manager with Serhat Güller?
SQL: SELECT "team" FROM league_manager_changes WHERE "replaced_by" = 'Serhat Güller'