diff --git a/src/server/db/schema.ts b/src/server/db/schema.ts
index 06eec43..fe29446 100644
--- a/src/server/db/schema.ts
+++ b/src/server/db/schema.ts
@@ -82,11 +82,17 @@ export const winesRelations = relations(wines, ({ one }) => ({
   }),
 }));
 
-export const subRegions = createTable("subRegion", {
-  id: uuid("id").primaryKey().notNull().defaultRandom(),
-  name: text("name").notNull().unique(),
-  regionId: uuid("regionId").notNull(),
-});
+export const subRegions = createTable(
+  "subRegion",
+  {
+    id: uuid("id").primaryKey().notNull().defaultRandom(),
+    name: text("name").notNull().unique(),
+    regionId: uuid("regionId").notNull(),
+  },
+  (t) => ({
+    uniqueSubRegion: unique().on(t.name, t.regionId),
+  }),
+);
 
 export const subRegionsRelations = relations(subRegions, ({ many, one }) => ({
   wines: many(wines),