diff --git a/src/main/scala/com/github/unchama/seichiassist/subsystems/gachaprize/infrastructure/JdbcGachaPrizeListPersistence.scala b/src/main/scala/com/github/unchama/seichiassist/subsystems/gachaprize/infrastructure/JdbcGachaPrizeListPersistence.scala
index 5dc90cc445..1ed2b9e27b 100644
--- a/src/main/scala/com/github/unchama/seichiassist/subsystems/gachaprize/infrastructure/JdbcGachaPrizeListPersistence.scala
+++ b/src/main/scala/com/github/unchama/seichiassist/subsystems/gachaprize/infrastructure/JdbcGachaPrizeListPersistence.scala
@@ -18,11 +18,7 @@ class JdbcGachaPrizeListPersistence[F[_]: Sync, ItemStack: Cloneable](
   override def list: F[Vector[GachaPrize[ItemStack]]] = {
     Sync[F].delay {
       DB.readOnly { implicit session =>
-        sql"""SELECT gachadata.id, gachadata.probability, gachadata.itemstack, gacha_events.event_name FROM gachadata
-             | LEFT OUTER JOIN gacha_events ON gachadata.event_id = gacha_events.id
-             | UNION
-             | SELECT gachadata.id, gachadata.probability, gachadata.itemstack, gacha_events.event_name FROM gachadata
-             | RIGHT OUTER JOIN gacha_events ON gachadata.event_id = gacha_events.id"""
+        sql"SELECT gachadata.id AS gacha_prize_id, probability, itemstack, event_name FROM gachadata INNER JOIN gacha_events ON gachadata.event_id = gacha_events.id"
           .stripMargin
           .map { rs =>
             val probability = rs.double("probability")
@@ -34,7 +30,7 @@ class JdbcGachaPrizeListPersistence[F[_]: Sync, ItemStack: Cloneable](
                   itemStack,
                   GachaProbability(probability),
                   probability < 0.1,
-                  GachaPrizeId(rs.int("id")),
+                  GachaPrizeId(rs.int("gacha_prize_id")),
                   rs.stringOpt("event_name").map(GachaEventName)
                 )
               }