MULTIDELETEの不明なテーブル

このクエリを試してください-

DELETE f
FROM table1 AS f
JOIN table2 AS dsy
  ON dsy.f1 = f.f1
JOIN table3 AS ds
  ON ds.f2 = f.f2
JOIN table4 AS dp
  ON dp.f3 = f.f3
JOIN table5 AS dg
  ON dg.f4 = f.f4
WHERE
  dsy.school_year = 2011 AND ds.id = 29620 AND dp.id = 14120 AND dg.grade_level = 5;