fix: SQL sub query alias

Author: Alex_Miao_WSL

backend/server/src/service/answer.rs

@@ -13,7 +13,7 @@ pub async fn user_is_answer_owner(
                     SELECT FROM answers ans
                      JOIN applications app ON ans.application_id = app.id
                      WHERE ans.id = $1 AND app.user_id = $2
-                )
+                ) sub
             )
         ",
         answer_id,

backend/server/src/service/application.rs

@@ -43,7 +43,7 @@ pub async fn user_is_application_owner(
             SELECT EXISTS(
                 SELECT 1 FROM (
                     SELECT FROM applications WHERE id = $1 AND user_id = $2
-                )
+                ) sub
             )
         ",
         application_id,