15 lines
782 B
SQL
15 lines
782 B
SQL
CREATE TABLE lesson_dependencies (
|
|
id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
|
|
organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
|
|
lesson_id UUID NOT NULL REFERENCES lessons(id) ON DELETE CASCADE,
|
|
prerequisite_lesson_id UUID NOT NULL REFERENCES lessons(id) ON DELETE CASCADE,
|
|
min_score_percentage DOUBLE PRECISION,
|
|
created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
|
|
UNIQUE(lesson_id, prerequisite_lesson_id),
|
|
CHECK (lesson_id != prerequisite_lesson_id)
|
|
);
|
|
|
|
CREATE INDEX idx_lesson_dependencies_lesson_id ON lesson_dependencies(lesson_id);
|
|
CREATE INDEX idx_lesson_dependencies_prerequisite_id ON lesson_dependencies(prerequisite_lesson_id);
|
|
CREATE INDEX idx_lesson_dependencies_org_id ON lesson_dependencies(organization_id);
|