ALTER TABLE exam_prep.unit_module_lessons DROP CONSTRAINT IF EXISTS chk_exam_prep_unit_module_lessons_access_tier;
ALTER TABLE exam_prep.unit_module_lessons DROP COLUMN IF EXISTS access_tier;

ALTER TABLE exam_prep.unit_modules DROP CONSTRAINT IF EXISTS chk_exam_prep_unit_modules_access_tier;
ALTER TABLE exam_prep.unit_modules DROP COLUMN IF EXISTS access_tier;

ALTER TABLE exam_prep.units DROP CONSTRAINT IF EXISTS chk_exam_prep_units_access_tier;
ALTER TABLE exam_prep.units DROP COLUMN IF EXISTS access_tier;

ALTER TABLE exam_prep.catalog_courses DROP CONSTRAINT IF EXISTS chk_exam_prep_catalog_courses_access_tier;
ALTER TABLE exam_prep.catalog_courses DROP COLUMN IF EXISTS access_tier;

ALTER TABLE lessons DROP CONSTRAINT IF EXISTS chk_lessons_access_tier;
ALTER TABLE lessons DROP COLUMN IF EXISTS access_tier;

ALTER TABLE modules DROP CONSTRAINT IF EXISTS chk_modules_access_tier;
ALTER TABLE modules DROP COLUMN IF EXISTS access_tier;

ALTER TABLE courses DROP CONSTRAINT IF EXISTS chk_courses_access_tier;
ALTER TABLE courses DROP COLUMN IF EXISTS access_tier;

ALTER TABLE programs DROP CONSTRAINT IF EXISTS chk_programs_access_tier;
ALTER TABLE programs DROP COLUMN IF EXISTS access_tier;