Relational Databases 101
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A brief introduction to relational databases, SQL and ActiveRecord. What's a SELECT, UPDATE, INSERT or DELETE query? What's an Index, a Foreign Key, a Primary Key?
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Interruptions turn each day into chunks of productivity. Each interruption costs a programmer at least 10 minutes, plus the time spent during the interruption.
Here are some tips to avoid interruptions and get to a flow state of mind. Kill interruptions before they kill your productivity.
When was the last time that you programmed without any interruptions?
Some of the tips:
1. Keep your email clients closed
2. Keep Twitter closed
3. Keep Facebook closed
4. Start tracking time spent on every project
5. Unplug your phone
6. Silence your cell phone
7. Use Slack
Manage your interruptions before they manage your productivity.
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We don't do TDD religiously but it is a good idea when you're facing a very complex problem.
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- 1. Relational Databases 101 Ombu Labs, August 2015
- 4. A database is a set of interconnected relations (tables)
- 5. Id Username Name 1 mauro-oto Mauro 2 alanhala Alan 3 ceci Cecilia 4 etagwerker Ernesto usersTable Name Columns Rows Unique Ids
- 6. Id Name 1 OmbuShop 2 InfractoresBA 3 Alpha 4 Beta projects
- 8. “A User has many Addresses.” For example
- 9. Users Addresses has many has one
- 10. Id Address User Id 1 Peru 212 23 2 Moldes 1333 55 3 Gorriti 332 212 4 Carranza 321 98 addresses Reference Column References
- 11. That is a “one to many” relationship
- 12. “A project has many people, and a person belongs to many projects.” For example
- 13. Users Projects has many has many
- 14. Users Projects has many has many Users_Projects has onehas one
- 15. That is a “many to many” relationship
- 16. Users Partner has one has one
- 17. That is a “one to one” relationship
- 19. MySQL, PostgreSQL, SQLServer, Oracle, DB2, MariaDB, etc…
- 20. SQL
- 22. A standardized way to CRUD records
- 24. SELECT * FROM users
- 25. Id Username Name 1 mauro-oto Mauro 2 alanhala Alan 3 ceci Cecilia 4 etagwerker Ernesto users
- 26. SELECT id, name FROM users WHERE name = ‘Ernesto’
- 28. SELECT <field names separated by commas> FROM <table name> WHERE <key> = <value>
- 30. UPDATE users SET name = ‘Ernesto T’ WHERE name = ‘Ernesto’
- 31. UPDATE <table_name> SET <key> = <value>, … WHERE <key> = <value>
- 33. INSERT INTO users (username, name) VALUES (‘pepe’, ‘Pedro P’)
- 34. INSERT INTO <table_name> (<column_name_1, …) VALUES (<value_1, …)
- 36. DELETE FROM users WHERE username = ‘pepe’
- 37. DELETE FROM <table_name> WHERE <key> = <value>
- 38. SQL Joins
- 39. “Find all the users with name Ernesto who live in the Moldes St.” For example
- 40. Users Addresses has many has one username name address zipcode
- 41. SELECT id, name FROM users INNER JOIN addresses ON users.id = addresses.user_id WHERE addresses.address LIKE ‘Moldes%’ AND users.name = ‘Ernesto’
- 42. Constraints
- 43. Primary keys
- 44. Id Username Name 1 mauro-oto Mauro 2 alanhala Alan 3 ceci Cecilia 4 etagwerker Ernesto users
- 45. users: primary key (id)
- 46. users_projects: primary key (user_id, project_id)
- 47. Foreign keys
- 48. Id Address User Id 1 Peru 212 23 2 Moldes 1333 55 3 Gorriti 332 212 4 Carranza 321 98 addresses Reference Column Foreign Keys
- 49. Indexes
- 50. Id Username Name 1 mauro-oto Mauro 2 alanhala Alan 3 ceci Cecilia 4 etagwerker Ernesto users Unique Indexes
- 52. Users (MySql) user.rb (Rails) Table Record/row Column Row value Class Object instance Attribute name Attribute
- 53. Thank you!
- 54. Questions?