From 1a95bd4e610770bed1571de6ddf572d5590561d9 Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Mon, 2 Mar 2020 16:21:26 +0000
Subject: Rework table structure

add sql queries
---
 sql/si.sql       | 37 +++++++++++++++++++++++++++++++++++++
 sql/weighted.sql |  8 ++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 sql/si.sql
 create mode 100644 sql/weighted.sql

(limited to 'sql')

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
+);
-- 
cgit v1.2.3-54-g00ecf