fix(sql): use 0 instead of null

Author: Ian2012

tutoraspects/templates/openedx-assets/queries/fact_video_watches.sql

@@ -12,9 +12,7 @@ select
     subsection_with_name,
     video_name,
     video_name_with_location,
-    concat(
-        '<a href="', video_id, '" target="_blank">', video_name_with_location, '</a>'
-    ) as video_link,
+    video_link,
     actor_id,
     username,
     email,
@@ -44,6 +42,7 @@ group by
     subsection_with_name,
     video_name,
     video_name_with_location,
+    video_link,
     actor_id,
     video_id,
     video_segment_count,

tutoraspects/templates/openedx-assets/queries/problem_coursewide_avg.sql

@@ -73,7 +73,7 @@ select
         '<a href="',
         full_responses.object_id,
         '" target="_blank">',
-        blocks.problem_name_with_location,
+        problem_name_with_location,
         '</a>'
     ) as problem_link,
     full_responses.actor_id as actor_id,
@@ -91,10 +91,10 @@ select
     coursewide_attempts.coursewide_percent_correct as coursewide_percent_correct,
     -- Learner-specific calculations (correcting the percentage calculations)
     (
-        case when full_responses.success then full_responses.attempts else null end
+        case when full_responses.success then full_responses.attempts else 0 end
     ) as correct_attempts_by_learner,
     (
-        case when not full_responses.success then full_responses.attempts else null end
+        case when not full_responses.success then full_responses.attempts else 0 end
     ) as incorrect_attempts_by_learner,
     -- Ensure we calculate percentage based on total attempts per problem (multiplied
     -- by 100 only once)