CREATE TABLE "managerial_changes" (
  "team" text,
  "outgoing_manager" text,
  "manner_of_departure" text,
  "date_of_vacancy" text,
  "replaced_by" text,
  "date_of_appointment" text,
  "position_in_table" text
);

Question: At what date did the 23rd manager vacate the position?
SQL: SELECT "date_of_vacancy" FROM "managerial_changes" WHERE "position_in_table"='23rd';

Question: What was the date of appointment for the manager that replaced Simon Davies? 
SQL: SELECT "date_of_appointment" FROM "managerial_changes" WHERE "outgoing_manager"='Simon Davies';

Question: What was the date of appointment for the manager of the 23rd team?
SQL: SELECT "date_of_appointment" FROM "managerial_changes" WHERE "position_in_table"='23rd';

Question: How many categories for, replaced by, exist when the outgoing manager is Alan Buckley? 
SQL: SELECT COUNT("replaced_by") FROM "managerial_changes" WHERE "outgoing_manager"='Alan Buckley';