Small presentation for an in house training showing how to use Redshift views to avoid problems while filtering our main events table.

1. Tableau + Redshift views
for dummies

2. GOAL
Generate a new table with the desired data

3. No, no, no, no
We are not going to:
• Delete
• Insert
• Update
(for the moment…)

4. What we use
Redshift (PostgreSQL 8.0.2)
Tableau 8.1
Workbench / Navicat / Aginity workbench (for
previous exploration)

5. Selecting columns
Select A, C
FROM table;
A B C
1 ES 10
2 DE 20
3 ES 30
4 FR 40
3 ES 40
6 FR 60
A C
1 10
2 20
3 30
4 40
3 40
6 60

6. Selecting columns and rows
A B C
1 ES 10
2 DE 20
3 ES 30
4 FR 40
3 ES 40
6 FR 60
A C
1 10
3 30
3 40
Select A, C
WHERE B = ‘ES’
FROM table;

7. Transforming data
A B C
1 ES 10
2 DE 20
3 ES 30
4 FR 40
3 ES 40
6 FR 60
Select A, SUM(C) AS revenue
FROM table
GROUP BY A;
A revenue
1 10
2 20
3 70
4 40
6 60

8. Transforming data with operators
A B C
1 ES 10
2 DE 20
3 ES 30
4 FR 40
3 ES 40
6 FR 60
Select A, (C – C*.3) AS benefits
FROM table;
A benefits
1 7
2 14
3 21
4 28
6 28
6 42

9. Mathematical operators
Select A, (C – C*.3) AS benefits
FROM table;
Operator Description Example Result
+ addition 2 + 3 5
- subtraction 2 - 3 -1
* multiplication 2 * 3 6
/ division 4 / 2 2
% modulo 5 % 4 1
^ exponentiation 2.0 ^ 3.0 8
|/ square root | / 25.0 5
||/ cube root || / 27.0 3
@ absolute value @ -5.0 5
Math functions:
http://docs.aws.amazon.com/redshift/latest/dg/Math_functions.html

10. What seems to work better
1. Create a view in Redshift
2. Add the view to the table
3. Edit the Join if needed
4. Ready to go

11. Create a view in Redshift
CREATE OR REPLACE VIEW public.payingusers
SELECT
transactions.user_id, sum(transactions.amount_in_dollars)
AS revenue
FROM transactions
WHERE transactions.amount_in_dollars > 0::numeric(12,4)
GROUP BY transactions.user_id;

12. What seems to work better
1. Create a view in Redshift
2. Add the view to the table
3. Edit the Join if needed
4. Ready to go

13. Add the view to the table
• In Data select Edit Tables… and add the view

14. What seems to work better
1. Create a view in Redshift
2. Add the view to the table
3. Edit the Join if needed
4. Ready to go

15. Edit the Join if needed
• In Tables select Edit… and check the Join.

16. Ready to go

17. Links
• http://www.w3schools.com/sql/
• http://sqlzoo.net
• http://aws.amazon.com/es/documentation/redshift/
• http://www.postgresql.org/docs/8.0/interactive/index.html
• http://www.aginity.com/workbench/redshift/
• http://www.navicat.com/

18. Thanks !
Ivan Magrans
Product Owner
Golden Manager
@ivan_mv
ivan@mediavida.com