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‎000_temp/62-kelowna/04-sql-union/union.sql‎

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CREATE DATABASE exampleunion;
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\c exampleunion
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CREATE TABLE customers (cid INT PRIMARY KEY NOT NULL, first TEXT);
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INSERT INTO customers VALUES (1, 'James'), (2, 'Sergey'), (3, 'Vladimir'), (4, 'Putin'), (5, 'Coup');
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CREATE TABLE vendors (vid INT PRIMARY KEY NOT NULL, first TEXT);
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INSERT INTO vendors VALUES (1, 'Stacey'), (2, 'Shelley'), (3, 'Sherry'), (4, 'Suzy'), (5, 'Sandy');
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CREATE TABLE employees (eid INT PRIMARY KEY NOT NULL, first TEXT);
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INSERT INTO employees VALUES (1, 'Jeff'), (2, 'John'), (3, 'Jerry'), (4, 'Jose'), (5, 'Juan');
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SELECT v.first FROM vendors AS v UNION SELECT e.first FROM employees AS e;
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SELECT 'customer' AS category, c.first FROM customers AS c UNION SELECT 'employee' AS category, e.first FROM employees AS e UNION SELECT 'vendor' AS category, v.first FROM vendors AS v UNION SELECT 'stuffedanimal' AS category, sa.saAnimalName FROM stuffedanimals AS sa;
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SELECT 'vendor' AS rowid, v.first FROM vendors AS v UNION SELECT 'employee' AS rowid, e.first FROM employees AS e;
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SELECT 'vendor' AS rowid, v.first FROM vendors AS v UNION SELECT 'employee' AS rowid, e.first FROM employees AS e UNION SELECT 'customer' AS rowid, c.first FROM customers AS c;
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SELECT 'vendor' AS rowid, v.first FROM vendors AS v UNION SELECT 'employee' AS rowid, e.first FROM employees AS e UNION SELECT 'customer' AS rowid, c.first FROM customers AS c ORDER BY rowid;
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SELECT 'vendor' AS rowid, v.first FROM vendors AS v UNION SELECT 'employee' AS rowid, e.first FROM employees AS e UNION SELECT 'customer' AS rowid, c.first FROM customers AS c ORDER BY first;
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SELECT 'vendor' AS rowid, v.first FROM vendors AS v UNION SELECT 'employee' AS rowid, e.first FROM employees AS e UNION SELECT 'customer' AS rowid, c.first FROM customers AS c ORDER BY rowid, first;
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SELECT 'vendor' AS rowid, v.first AS name FROM vendors AS v UNION SELECT 'employee' AS rowid, e.first AS name FROM employees AS e UNION SELECT 'customer' AS rowid, c.first AS name FROM customers AS c ORDER BY rowid, name;

‎000_temp/62-kelowna/05-subqueries/subqueries.sql‎

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CREATE DATABASE acmesales;
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\c acmesales
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CREATE TABLE customers (cid INT PRIMARY KEY NOT NULL, cfirst TEXT);
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INSERT INTO customers VALUES (1,'Cory'), (2,'Casey'), (3,'Canard'), (4,'Cully'), (5,'Coffer'), (6,'Homey');
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CREATE TABLE items (iid INT PRIMARY KEY NOT NULL, iitem TEXT);
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INSERT INTO items VALUES (1,'dog food'), (2,'tiramisu'), (3,'vino'), (4,'cheese'), (5,'chocolate'), (6,'gummy worms'), (7,'mango');
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CREATE TABLE orders (oid INT PRIMARY KEY NOT NULL, cid INT REFERENCES customers(cid), odate TEXT);
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INSERT INTO orders VALUES (1,2,'tuesday'), (2,5,'wednesday'), (3,1,'thursday'), (4,3,'sunday'), (5,4,'saturday'), (6,5,'friday');
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CREATE TABLE orderitems (oiid INT PRIMARY KEY NOT NULL, oid INT REFERENCES orders(oid), iid INT REFERENCES items(iid));
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INSERT INTO orderitems VALUES (1,4,6), (2,4,5), (3,5,4), (4,6,3), (5,1,2), (6,2,1), (7,3,6), (8,4,5), (9,5,4), (10,6,3);
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SELECT c.cfirst, o.oid, o.odate, i.iitem FROM customers AS c JOIN orders AS o ON c.cid = o.cid JOIN orderitems AS oi ON o.oid = oi.oid JOIN items AS i ON oi.iid = i.iid;
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SELECT c.cfirst, o.oid, o.odate, i.iitem FROM customers AS c FULL JOIN orders AS o ON c.cid = o.cid FULL JOIN orderitems AS oi ON o.oid = oi.oid FULL JOIN items AS i ON oi.iid = i.iid;
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// SCALAR
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// an expression that evaluates to one value
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// aka, one column & one row = one field value
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SELECT o.oid, o.odate, (SELECT c.cfirst FROM customers AS c WHERE c.cid = o.cid) FROM orders AS o;
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// could have also done the above this way
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SELECT o.oid, o.odate, c.cfirst FROM customers AS c JOIN orders AS o ON c.cid = o.cid;
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// aggregate function COUNT
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SELECT COUNT(cfirst) AS ourcustomers FROM customers;
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SELECT c.cfirst, (SELECT COUNT(*) FROM orders AS o WHERE c.cid = o.cid) AS ordercount FROM customers AS c;
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// aggregate function MAX
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SELECT MAX(cid) AS highestcid FROM customers;
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SELECT MAX(odate) AS maxday FROM orders;
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SELECT c.cfirst, (SELECT MAX(o.oid) FROM orders AS o WHERE c.cid = o.cid) AS maxoid FROM customers AS c;
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// subquery as filters
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// subquery with the WHERE clause
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SELECT o.oid, o.odate, c.cfirst FROM customers AS c JOIN orders AS o ON c.cid = o.cid WHERE o.odate = (SELECT MAX(odate) FROM orders);
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// subquery as filters
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// subquery with the IN keyword
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SELECT o.oid, o.odate, c.cfirst FROM customers AS c JOIN orders AS o ON c.cid = o.cid WHERE o.odate IN (SELECT odate FROM orders WHERE odate LIKE '%u%');
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// ALL, SOME, ANY keywords
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SELECT o.oid, o.odate, c.cfirst FROM customers AS c JOIN orders AS o ON c.cid = o.cid WHERE o.odate = ANY (SELECT odate FROM orders WHERE odate LIKE '%u%');
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SELECT o.oid, o.odate, c.cfirst FROM customers AS c JOIN orders AS o ON c.cid = o.cid WHERE o.odate = SOME (SELECT odate FROM orders WHERE odate LIKE '%u%');
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SELECT o.oid, o.odate, c.cfirst FROM customers AS c JOIN orders AS o ON c.cid = o.cid WHERE o.odate = ALL (SELECT odate FROM orders WHERE odate LIKE '%u%');
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SELECT o.oid, o.odate, c.cfirst FROM customers AS c JOIN orders AS o ON c.cid = o.cid WHERE o.odate = ALL (SELECT odate FROM orders WHERE odate LIKE 'thur%');
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SELECT o.oid, o.odate, c.cfirst FROM customers AS c JOIN orders AS o ON c.cid = o.cid WHERE o.odate > ALL (SELECT odate FROM orders WHERE odate LIKE 'thur%');
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// EXISTS
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// I DO NOT KNOW HOW THIS WORKS
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// MORE RESEARCH AND EXPERIMENTATION ARE NEEDED
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SELECT c.cfirst, o.oid, o.odate, i.iitem FROM customers AS c JOIN orders AS o ON c.cid = o.cid JOIN orderitems AS oi ON o.oid = oi.oid JOIN items AS i ON oi.iid = i.iid;
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SELECT c.cfirst, o.oid, o.odate, i.iitem FROM customers AS c JOIN orders AS o ON c.cid = o.cid JOIN orderitems AS oi ON o.oid = oi.oid JOIN items AS i ON oi.iid = i.iid WHERE i.iitem = 'chocolate';
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SELECT c.cfirst, o.oid, o.odate, i.iitem FROM customers AS c JOIN orders AS o ON c.cid = o.cid JOIN orderitems AS oi ON o.oid = oi.oid JOIN items AS i ON oi.iid = i.iid WHERE EXISTS (SELECT c.cfirst, o.oid, o.odate, i.iitem FROM customers AS c JOIN orders AS o ON c.cid = o.cid JOIN orderitems AS oi ON o.oid = oi.oid JOIN items AS i ON oi.iid = i.iid WHERE i.iitem = 'chocolate');
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‎000_temp/62-kelowna/06-hollywood/subqueries.sql‎

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CREATE DATABASE hollywood;
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\l
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\c hollywood
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CREATE TABLE customers (cid INT PRIMARY KEY NOT NULL, cname TEXT);
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INSERT INTO customers VALUES (1,'Charlie'), (2,'Chris'), (3,'Christina'), (4,'Cassandra'), (5,'Cull'), (6,'Cabron'), (7,'Carla'), (8,'Caitland'), (9,'Colleen'), (10,'Christian');
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CREATE TABLE movies (mid INT PRIMARY KEY NOT NULL, mname TEXT);
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INSERT INTO movies VALUES (1,'Jaws'), (2,'First Blood'), (3,'Rambo'), (4,'Terms of Endearment'), (5,'Heat'), (6,'The Lives of Others'), (7,'A Man Called Ove'), (8,'Disconnect'), (9,'Ex Machina'), (10,'Castle');
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CREATE TABLE actors (aid INT PRIMARY KEY NOT NULL, aname TEXT);
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INSERT INTO actors VALUES (1,'Alfred'), (2,'Albert'), (3,'Angel'), (4,'Angelina'), (5,'Angie'), (6,'Agnes'), (7,'Amnia'), (8,'Allison'), (9,'Alejandro'), (10,'Aerial');
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CREATE TABLE rentals (rid INT PRIMARY KEY NOT NULL, cid INT NOT NULL REFERENCES customers(cid), mid INT NOT NULL REFERENCES movies(mid));
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INSERT INTO rentals VALUES (1,2,8),(2,8,10),(3,2,9),(4,6,1),(5,7,1),(6,5,2),(7,3,10),(8,9,5),(9,2,6),(10,8,7),(11,6,7),(12,9,9),(13,8,8),(14,8,9),(15,1,6),(16,2,9),(17,8,2),(18,10,7),(19,8,2),(20,6,7),(21,4,1),(22,5,4),(23,4,8),(24,9,5),(25,10,4),(26,8,2),(27,10,10),(28,1,6),(29,9,9),(30,4,6),(31,2,1),(32,6,7),(33,7,9),(34,2,3),(35,4,7),(36,4,7),(37,3,9),(38,8,5),(39,8,4),(40,7,1),(41,4,4),(42,8,4),(43,2,10),(44,4,4),(45,2,3),(46,9,7),(47,7,8),(48,1,4),(49,3,4),(50,6,9),(51,6,2),(52,6,8),(53,8,1),(54,1,6),(55,1,3),(56,9,4),(57,2,3),(58,5,8),(59,8,8),(60,2,5),(61,7,3),(62,2,10),(63,7,1),(64,4,7),(65,10,2),(66,3,6),(67,6,1),(68,8,10),(69,9,9),(70,5,4),(71,5,8),(72,3,3),(73,7,10),(74,1,7),(75,2,7),(76,1,2),(77,5,5),(78,6,4),(79,2,1),(80,3,9),(81,8,2),(82,9,5),(83,3,4),(84,3,9),(85,4,9),(86,7,1),(87,6,1),(88,5,3),(89,8,6),(90,2,10),(91,1,4),(92,1,10),(93,1,4),(94,1,5),(95,8,1),(96,6,3),(97,10,1),(98,9,7),(99,6,7),(100,1,7);
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CREATE TABLE castmembers (caid INT PRIMARY KEY NOT NULL, mid INT NOT NULL REFERENCES movies(mid), aid INT NOT NULL REFERENCES actors(aid));
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INSERT INTO castmembers VALUES (1,2,8),(2,8,10),(3,2,9),(4,6,1),(5,7,1),(6,5,2),(7,3,10),(8,9,5),(9,2,6),(10,8,7),(11,6,7),(12,9,9),(13,8,8),(14,8,9),(15,1,6),(16,2,9),(17,8,2),(18,10,7),(19,8,2),(20,6,7),(21,4,1),(22,5,4),(23,4,8),(24,9,5),(25,10,4),(26,8,2),(27,10,10),(28,1,6),(29,9,9),(30,4,6),(31,2,1),(32,6,7),(33,7,9),(34,2,3),(35,4,7),(36,4,7),(37,3,9),(38,8,5),(39,8,4),(40,7,1),(41,4,4),(42,8,4),(43,2,10),(44,4,4),(45,2,3),(46,9,7),(47,7,8),(48,1,4),(49,3,4),(50,6,9),(51,6,2),(52,6,8),(53,8,1),(54,1,6),(55,1,3),(56,9,4),(57,2,3),(58,5,8),(59,8,8),(60,2,5),(61,7,3),(62,2,10),(63,7,1),(64,4,7),(65,10,2),(66,3,6),(67,6,1),(68,8,10),(69,9,9),(70,5,4),(71,5,8),(72,3,3),(73,7,10),(74,1,7),(75,2,7),(76,1,2),(77,5,5),(78,6,4),(79,2,1),(80,3,9),(81,8,2),(82,9,5),(83,3,4),(84,3,9),(85,4,9),(86,7,1),(87,6,1),(88,5,3),(89,8,6),(90,2,10),(91,1,4),(92,1,10),(93,1,4),(94,1,5),(95,8,1),(96,6,3),(97,10,1),(98,9,7),(99,6,7),(100,1,7);
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SELECT c.cname, m.mname FROM customers AS c JOIN rentals AS r ON c.cid = r.cid JOIN movies AS m ON r.mid = m.mid;
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SELECT a.aname, m.mname FROM actors AS a JOIN castmembers AS cm ON a.aid = cm.aid JOIN movies AS m ON cm.mid = m.mid;
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INSERT INTO customers VALUES (101, 'Mike'), (102, 'Max');
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INSERT INTO movies VALUES (101, 'Aliens'), (102, 'Ragoon');
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INSERT INTO actors VALUES (101, 'Milfred'), (102, 'Martine');
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SELECT c.cname, m.mname, a.aname FROM customers AS c FULL JOIN rentals AS r ON c.cid = r.cid FULL JOIN movies AS m ON r.mid = m.mid FULL JOIN castmembers AS cm ON m.mid = cm.mid FULL JOIN actors AS a ON cm.aid = a.aid;
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‎000_temp/63-fall-2018/035-hash-bucket/main.go‎

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package main
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import (
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"bufio"
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"fmt"
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"log"
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"net/http"
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)
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func main() {
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// get the book moby dick
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res, err := http.Get("http://www.gutenberg.org/files/2701/old/moby10b.txt")
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if err != nil {
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log.Fatal(err)
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}
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// scan the page
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scanner := bufio.NewScanner(res.Body)
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defer res.Body.Close()
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// Set the split function for the scanning operation.
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scanner.Split(bufio.ScanWords)
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// Create slice to hold counts
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buckets := make([]int, 200)
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// Loop over the words
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for scanner.Scan() {
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fmt.Print(scanner.Text(), " - ")
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n := hashBucket(scanner.Text())
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fmt.Println(buckets[n])
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buckets[n]++
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}
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fmt.Println(buckets[65:123])
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// fmt.Println("***************")
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// for i := 28; i <= 126; i++ {
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// fmt.Printf("%v - %c - %v \n", i, i, buckets[i])
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// }
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}
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func hashBucket(word string) int {
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return int(word[0])
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}

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