├── dvdrental.zip
└── README.md


/dvdrental.zip:
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https://raw.githubusercontent.com/Innarticles/Data-Analytics-Training-at-Utiva/HEAD/dvdrental.zip


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/README.md:
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 1 | # Data Analytics Training at Utiva
 2 | Training Resources and Links 
 3 | [Slides](https://docs.google.com/presentation/d/1hveKHs6rw_eU9p7Hia77B0RfjHOQiRhozguMjdvtb7o/edit?usp=sharing)
 4 | 
 5 | ## SQL Installations (Postgres)
 6 | - Windows - https://www.enterprisedb.com/downloads/postgres-postgresql-downloads
 7 | - Mac OS - https://www.enterprisedb.com/downloads/postgres-postgresql-downloads
 8 | - Ubuntu - https://www.postgresql.org/download/linux/ubuntu/
 9 | - Others - https://www.postgresql.org/download/
10 | 
11 | ## Sample Datasets 
12 | - Film Business Data [Click to download](https://www.postgresqltutorial.com/wp-content/uploads/2019/05/dvdrental.zip)
13 | - Extract to .tar file 
14 | - Using PgAdmin, create a database and restore the database by pointing to the .tar file (dvdrental.tar)
15 | 
16 | ## Practise online
17 | - https://www.w3resource.com/sql-exercises/
18 | 
19 | ## Instructions on getting updates for on this page
20 | - Watch and Follow this repository (Click on the Watch and Star button at the top right corner of this page). This will enable you get email notification once there is a new update.
21 | 
22 | ## Sample Tables Demostrating types of SQL Joins
23 | ```
24 | CREATE TABLE basket_a (
25 |     id INT PRIMARY KEY,
26 |     fruit VARCHAR (100) NOT NULL
27 | );
28 |  
29 | CREATE TABLE basket_b (
30 |     id INT PRIMARY KEY,
31 |     fruit VARCHAR (100) NOT NULL
32 | );
33 |  
34 | INSERT INTO basket_a (id, fruit)
35 | VALUES
36 |     (1, 'Apple'),
37 |     (2, 'Orange'),
38 |     (3, 'Banana'),
39 |     (4, 'Cucumber');
40 |    
41 |  
42 | INSERT INTO basket_b (id, fruit)
43 | VALUES
44 |     (1, 'Orange'),
45 |     (2, 'Apple'),
46 |     (3, 'Watermelon'),
47 |     (4, 'Pear');
48 | ```
49 | 
50 | ## Update on in-class exercise on using `WHERE IN ()` with `INNER JOIN` 
51 | Proposed Solution that failed
52 | ```
53 | SELECT 
54 |  *
55 | FROM 
56 |  customer
57 | INNER JOIN payment on (payment.customer_id = customer.customer_id)
58 | WHERE payment.customer_id IN (
59 | 	SELECT 
60 | 	Distinct payment.customer_id
61 | 	FROM payment
62 | 	WHERE payment.amount > 5.0
63 | );
64 | ```
65 | Working Solution - Even simpler!!
66 | ```
67 | 
68 | SELECT 
69 | 	*
70 | FROM 
71 |  customer
72 | INNER JOIN payment on (payment.customer_id = customer.customer_id)
73 | WHERE payment.amount > 5.0
74 | 
75 | ```
76 | 


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