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‎000_temp/68-sql-group-having/having.sql

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CREATE DATABASE music;
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\c music
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CREATE TABLE musicians (mid INT PRIMARY KEY NOT NULL, mname TEXT NOT NULL);
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INSERT INTO musicians VALUES (1, 'Dave Mustang'), (2, 'Steven Tyler'), (3, 'Sam Smith'), (4, 'Sarah McLachlan'), (5, 'Bono'), (6, 'Steve Miller'), (7, 'Bruce Springsteen');
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CREATE TABLE bands (bid INT PRIMARY KEY NOT NULL, bname TEXT NOT NULL);
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INSERT INTO bands VALUES (1, 'Aerosmith'), (2, 'U2'), (3, 'Ghost'), (4, 'E Street'), (5, 'Metallica'), (6, 'Megadeath');
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CREATE TABLE bandmembers (bmid INT PRIMARY KEY NOT NULL, bid INT REFERENCES bands(bid) NOT NULL, mid INT REFERENCES musicians(mid) NOT NULL);
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INSERT INTO bandmembers VALUES (1,1,1), (2,2,2), (3,3,3), (4,4,4), (5,5,5), (6,5,7), (7,4,4), (8,3,3);
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CREATE TABLE styles (sid INT PRIMARY KEY NOT NULL, sname TEXT NOT NULL);
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INSERT INTO styles VALUES (1,'jazz'), (2,'metal'), (3,'rock'), (4,'country'), (5,'pop'), (6,'folk');
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CREATE TABLE bandstyles (bsid INT PRIMARY KEY NOT NULL, bid INT REFERENCES bands(bid) NOT NULL, sid INT REFERENCES styles(sid) NOT NULL);
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INSERT INTO bandstyles VALUES (1,1,1), (2,2,2), (3,3,3), (4,4,4), (5,5,5), (6,4,4), (7,3,3);
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------------ queries ---------------
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SELECT m.mname, b.bname, s.sname FROM (((musicians AS m FULL JOIN bandmembers AS bm ON m.mid = bm.mid) FULL JOIN bands AS b ON bm.bid = b.bid) FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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/* generate more band members */
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https://play.golang.org/p/uv2g4Ap21Sl
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INSERT INTO bandmembers VALUES (9,2,3),(10,3,5),(11,2,4),(12,1,1),(13,2,1),(14,5,2),(15,3,5),(16,4,5),(17,2,1),(18,3,2),(19,1,2),(20,4,4),(21,3,3),(22,3,4),(23,1,1),(24,2,4),(25,3,2),(26,5,2),(27,3,2),(28,1,2),(29,4,1),(30,5,4),(31,4,3),(32,4,5),(33,5,4),(34,3,2),(35,5,5),(36,1,1),(37,4,4),(38,4,1),(39,2,1),(40,1,2);
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SELECT bname, sname FROM (bands AS b LEFT JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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SELECT m.mname, b.bname FROM (musicians AS m LEFT JOIN bandmembers AS bm ON m.mid = bm.mid) LEFT JOIN bands AS b ON bm.bid = b.bid;
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SELECT m.mname, b.bname FROM (musicians AS m LEFT JOIN bandmembers AS bm ON m.mid = bm.mid) LEFT JOIN bands AS b ON bm.bid = b.bid GROUP BY m.mname, b.bname;
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SELECT m.mid, m.mname, b.bname FROM (musicians AS m LEFT JOIN bandmembers AS bm ON m.mid = bm.mid) LEFT JOIN bands AS b ON bm.bid = b.bid GROUP BY m.mid, m.mname, b.bname;
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/* does not work*/
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SELECT b.bname, s.sname, COUNT(*) AS members FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid;
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SELECT COUNT(*) AS total FROM musicians;
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/* does not work*/
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SELECT COUNT(*) AS total FROM musicians GROUP BY mname;
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SELECT mname, COUNT(*) AS total FROM musicians GROUP BY mname;
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SELECT b.bname, s.sname, COUNT(*) AS members FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid GROUP BY b.bname, s.sname;
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SELECT b.bname, s.sname, COUNT(*) AS members FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid GROUP BY b.bname, s.sname HAVING COUNT(*) > 10;
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SELECT b.bname, s.sname, COUNT(bm.bmid) AS bandmembers FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid GROUP BY b.bname, s.sname;
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SELECT b.bname, s.sname, COUNT(bm.bmid) AS bandmembers FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid GROUP BY b.bname, s.sname HAVING COUNT(*) > 10;
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‎000_temp/69-review-golang/main.go

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package main
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import (
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"html/template"
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"net/http"
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)
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var tpl *template.Template
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func init() {
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tpl = template.Must(template.ParseGlob("templates/*.gohtml"))
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}
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func main() {
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http.HandleFunc("/", def)
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http.HandleFunc("/about", abo)
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http.Handle("/foobar", http.NotFoundHandler())
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http.ListenAndServe(":8080", nil)
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}
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func def(w http.ResponseWriter, r *http.Request) {
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tpl.ExecuteTemplate(w, "default.gohtml", nil)
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}
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func abo(w http.ResponseWriter, r *http.Request) {
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tpl.ExecuteTemplate(w, "about.gohtml", nil)
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}

‎000_temp/69-review-golang/templates/about.gohtml

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport"
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content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>ABOUT</title>
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</head>
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<body>
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<h1><a href="/">HOME</a></h1>
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<h1>ABOUT</h1>
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</body>
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</html>

‎000_temp/69-review-golang/templates/default.gohtml

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport"
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content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>HOME</title>
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</head>
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<body>
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<h1>HOME</h1>
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<h1><a href="/about">ABOUT</a></h1>
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</body>
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</html>

‎000_temp/70-sql/having.sql

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SELECT m.mname, b.bname, s.sname FROM (((musicians AS m FULL JOIN bandmembers AS bm ON m.mid = bm.mid) FULL JOIN bands AS b ON bm.bid = b.bid) FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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SELECT s.sname, COUNT(b.bname) AS bands FROM (((musicians AS m FULL JOIN bandmembers AS bm ON m.mid = bm.mid) FULL JOIN bands AS b ON bm.bid = b.bid) FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY s.sname;
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SELECT s.sname, COUNT(DISTINCT(b.bname)) AS bands FROM (((musicians AS m FULL JOIN bandmembers AS bm ON m.mid = bm.mid) FULL JOIN bands AS b ON bm.bid = b.bid) FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY s.sname;
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SELECT DISTINCT(b.bname) AS name FROM bands AS b;
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SELECT DISTINCT(bname) FROM bands;
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SELECT * FROM bands;
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INSERT INTO bands VALUES (7, 'Madonna');
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INSERT INTO bands VALUES (8, 'Madonna');
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SELECT b.bname, s.sname FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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INSERT INTO bandstyles VALUES (8,5,2), (9,4,1), (10,3,2), (11,2,3), (12,1,4), (13,1,5), (14,1,6);
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SELECT m.mname, b.bname, s.sname FROM (((musicians AS m FULL JOIN bandmembers AS bm ON m.mid = bm.mid) FULL JOIN bands AS b ON bm.bid = b.bid) FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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SELECT s.sname, COUNT(b.bname) AS bands FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY s.sname;
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SELECT s.sname, COUNT(m.mname) AS musicians FROM (((musicians AS m FULL JOIN bandmembers AS bm ON m.mid = bm.mid) FULL JOIN bands AS b ON bm.bid = b.bid) FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY s.sname;
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SELECT s.sname, COUNT(DISTINCT(b.bname)) AS bands FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY s.sname;
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SELECT bname, sname FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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SELECT sname, bname FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid ORDER BY bname;
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SELECT DISTINCT bname, sname AS bands FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid ORDER BY bname;
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SELECT DISTINCT sname, bname AS bands FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid ORDER BY bname;
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SELECT DISTINCT sname, COUNT(bname) AS bands FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY sname;
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SELECT sname, COUNT(bname) AS bands FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY sname;
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SELECT DISTINCT sname, bname FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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SELECT sname, bname FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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SELECT sname, COUNT(bname) as bands FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY sname;
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SELECT DISTINCT sname, COUNT(bname) as bands FROM (bands AS b FULL JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid GROUP BY sname;
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/* generate more band members */
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https://play.golang.org/p/uv2g4Ap21Sl
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INSERT INTO bandmembers VALUES (9,2,3),(10,3,5),(11,2,4),(12,1,1),(13,2,1),(14,5,2),(15,3,5),(16,4,5),(17,2,1),(18,3,2),(19,1,2),(20,4,4),(21,3,3),(22,3,4),(23,1,1),(24,2,4),(25,3,2),(26,5,2),(27,3,2),(28,1,2),(29,4,1),(30,5,4),(31,4,3),(32,4,5),(33,5,4),(34,3,2),(35,5,5),(36,1,1),(37,4,4),(38,4,1),(39,2,1),(40,1,2);
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SELECT bname, sname FROM (bands AS b LEFT JOIN bandstyles AS bs ON b.bid = bs.bid) FULL JOIN styles AS s ON bs.sid = s.sid;
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SELECT m.mname, b.bname FROM (musicians AS m LEFT JOIN bandmembers AS bm ON m.mid = bm.mid) LEFT JOIN bands AS b ON bm.bid = b.bid;
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SELECT m.mname, b.bname FROM (musicians AS m LEFT JOIN bandmembers AS bm ON m.mid = bm.mid) LEFT JOIN bands AS b ON bm.bid = b.bid GROUP BY m.mname, b.bname;
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SELECT m.mid, m.mname, b.bname FROM (musicians AS m LEFT JOIN bandmembers AS bm ON m.mid = bm.mid) LEFT JOIN bands AS b ON bm.bid = b.bid GROUP BY m.mid, m.mname, b.bname;
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/* does not work*/
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SELECT b.bname, s.sname, COUNT(*) AS members FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid;
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SELECT COUNT(*) AS total FROM musicians;
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/* does not work*/
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SELECT COUNT(*) AS total FROM musicians GROUP BY mname;
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SELECT mname, COUNT(*) AS total FROM musicians GROUP BY mname;
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SELECT b.bname, s.sname, COUNT(*) AS members FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid GROUP BY b.bname, s.sname;
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SELECT b.bname, s.sname, COUNT(*) AS members FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid GROUP BY b.bname, s.sname HAVING COUNT(*) > 10;
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SELECT b.bname, s.sname, COUNT(bm.bmid) AS bandmembers FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid GROUP BY b.bname, s.sname;
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SELECT b.bname, s.sname, COUNT(bm.bmid) AS bandmembers FROM (((musicians AS m JOIN bandmembers AS bm ON m.mid = bm.mid) JOIN bands AS b ON bm.bid = b.bid) JOIN bandstyles AS bs ON b.bid = bs.bid) JOIN styles AS s ON bs.sid = s.sid GROUP BY b.bname, s.sname HAVING COUNT(*) > 10;
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‎000_temp/71/assets/city.jpeg

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‎000_temp/71/assets/main.css

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html, body {
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padding: 0;
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border: 0;
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margin: 0;
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box-sizing: border-box;
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}
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#atf {
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height: 100vh;
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background-color: cornflowerblue;
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background-image: url("/stuff/city.jpeg");
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background-repeat: no-repeat;
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background-size: cover;
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background-position: center;
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display: flex;
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justify-content: center;
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align-items: center;
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font-size: 13vw;
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color: white;
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}
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header {
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position: fixed;
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top: 0;
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left: 0;
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background-color: rgba(97, 115, 255, 0.44);
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height: 5vh;
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width: 100vw;
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display: flex;
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justify-content: space-between;
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align-items: center;
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}
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header > div {
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font-size: 1.5rem;
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color: white;
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margin: 0 2rem;
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}

‎000_temp/71/assets/toby.jpg

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‎000_temp/71/main.go

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package main
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import (
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"html/template"
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"net/http"
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)
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var tpl *template.Template
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func init() {
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tpl = template.Must(template.ParseGlob("templates/*.gohtml"))
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}
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func main() {
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http.HandleFunc("/", hom)
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http.HandleFunc("/about", abo)
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http.Handle("/stuff/", http.StripPrefix("/stuff", http.FileServer(http.Dir("./assets/"))))
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http.ListenAndServe(":8080", nil)
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}
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func hom(w http.ResponseWriter, r *http.Request) {
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tpl.ExecuteTemplate(w, "default.gohtml", nil)
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}
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func abo(w http.ResponseWriter, r *http.Request) {
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tpl.ExecuteTemplate(w, "about.gohtml", nil)
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}

‎000_temp/71/templates/about.gohtml

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport"
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content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>Legal Firm ABOUT Page</title>
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</head>
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<body>
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<h1>ABOUT</h1>
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<a href="/home">HOME</a>
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<a href="/about">ABOUT</a>
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</body>
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</html>

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