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added safety div with nullif

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dr0zd
2026-01-06 16:36:58 +07:00
parent c1d1796679
commit 88db25d7d5
3 changed files with 4 additions and 4 deletions
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mdrozdov/postgresql/dm_platform_summary.sql
+2 -2
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@@ -4,5 +4,5 @@ select
(select count(id) from courses) as total_courses,
(select count(id) from lessons) as total_lessons,
(select count(distinct user_id) from lessons_views) as users_with_views,
round((select count(id) from lessons)*1.0/(select count(id) from courses), 2) as avg_lessons_per_course,
(select count(id) from lessons_views)*1.0/(select count(id) from lessons)
round((select count(id) from lessons)*1.0/nullif((select count(id) from courses), 0), 2) as avg_lessons_per_course,
round((select count(id) from lessons_views)*1.0/nullif((select count(id) from lessons), 0), 2) as avg_views_per_lesson