diff --git a/migrations/198_study_question_images.sql b/migrations/198_study_question_images.sql
index 4df865b..6ab493f 100644
--- a/migrations/198_study_question_images.sql
+++ b/migrations/198_study_question_images.sql
@@ -1,4 +1,4 @@
--- 198_study_question_images.sql
+-- 198_study_question_images.sql (1/2)
 -- 문제별 첨부 이미지 (PR-8). 한 문제에 여러 이미지 가능 (회로도+그래프 등).
 --
 -- 저장 위치: NAS `/documents/study_question_images/{topic_id}/{question_id}/{image_id}.{ext}`
@@ -16,6 +16,3 @@ CREATE TABLE IF NOT EXISTS study_question_images (
     sort_order           INTEGER NOT NULL DEFAULT 0,
     created_at           TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
-
-CREATE INDEX IF NOT EXISTS idx_study_question_images_qid
-    ON study_question_images (study_question_id, sort_order, id);
diff --git a/migrations/199_study_question_images_idx.sql b/migrations/199_study_question_images_idx.sql
new file mode 100644
index 0000000..c88bad6
--- /dev/null
+++ b/migrations/199_study_question_images_idx.sql
@@ -0,0 +1,5 @@
+-- 199_study_question_images_idx.sql (2/2)
+-- study_question 별 이미지 정렬 조회 (sort_order 오름차순).
+
+CREATE INDEX IF NOT EXISTS idx_study_question_images_qid
+    ON study_question_images (study_question_id, sort_order, id);