Rework table structure

add sql queries

2 files changed, 45 insertions, 0 deletions

diff --git a/sql/si.sql b/sql/si.sql
new file mode 100644
index 0000000..0b2cb22
--- /dev/null
+++ b/sql/si.sql
@@ -0,0 +1,37 @@
+/*
+SELECT track_id, SUM(score)/2
+FROM user_track
+WHERE user_id IN (
+	SELECT user_id
+	FROM suser
+	WHERE user_name = 'd-kobert'
+	OR user_name = 'thilo'
+)
+GROUP BY track_id
+HAVING COUNT(track_id) = 2
+ORDER BY SUM(score) DESC;
+*/
+
+-- alternative
+WITH users AS (
+	SELECT *
+	FROM ( VALUES
+
+		('d-kobert'), ('thilo')
+
+	) AS _ (user_name)
+)
+--SELECT track_id, SUM(score) / (SELECT COUNT(*) FROM users) AS score
+SELECT track_id, name, artist
+FROM track
+JOIN (
+SELECT track_id
+FROM user_track
+JOIN suser USING (user_id)
+JOIN track USING (track_id)
+WHERE suser.user_name IN (SELECT * FROM users)
+GROUP BY track_id
+HAVING COUNT(track_id) = (SELECT COUNT(*) FROM users)
+ORDER BY SUM(score) DESC
+) AS _ USING (track_id)
+;
diff --git a/sql/weighted.sql b/sql/weighted.sql
new file mode 100644
index 0000000..dfa23c1
--- /dev/null
+++ b/sql/weighted.sql
@@ -0,0 +1,8 @@
+CREATE OR REPLACE VIEW user_track_weighted AS (
+    SELECT *, "count" / (
+        SELECT SUM("count")
+        FROM user_track ut
+        WHERE ut.user_id = user_id
+    )::decimal AS score
+    FROM user_track
+);