Your SlideShare is downloading. ×
Introduction to PostgreSQL
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Introduction to PostgreSQL

2,506
views

Published on


0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
2,506
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
67
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Introduction to Databases with PostgreSQL Gabrielle Roth PDXPUG & FreeGeek Nov 9, 2010
  • 2. Outline Intro to Databases (discussion) PostgreSQL (discussion) psql (hands-on) SQL (hands-on) ...break somewhere in here, 7:30... Practice db + more SQL (hands-on) Basic Admin + GUI Tools (discussion) Questions Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 2 / 1
  • 3. Introductions __ __ / ~~~/ . o O ( Hi! ) ,----( oo ) / __ __/ /| ( |( ^ /___ / | |__| |__|-" Thanks to Hayley J Wakenshaw for the Elephant Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 3 / 1
  • 4. Databases! A place to keep your data! Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 4 / 1
  • 5. Relational databases Based on Relational Calculus Data is stored in ”relations” ”Normalized” Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 5 / 1
  • 6. PostgreSQL - How do you say that? - It’s the database *server* - We think it’s the best. Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 6 / 1
  • 7. Get connected. chmod 600 /path/to/id_pdxpug ssh -i /path/to/id_pdxpug pdxpug@207.173.203.228 Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 7 / 1
  • 8. Pg command-line interface - psql - - -help - psql -U [username] -d pdxpug - h - ? - other useful commands Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 8 / 1
  • 9. SQL - Declarative programming language - ...let’s do ”Hello World”. Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 9 / 1
  • 10. Hello, World. SELECT ’Hello, World.’; ...oh yeah, and there’s command-completion, too. Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 10 / 1
  • 11. CREATE TABLE CREATE TABLE animals (name varchar(32) primary key, skin varchar(32), legs int); Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 11 / 1
  • 12. INSERT INSERT INTO animals VALUES (’cat’, ’fur’, ’4’); Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 12 / 1
  • 13. multi-valued INSERT insert into animals values (’dog’, ’fur’, ’4’), (’bird’, ’feathers’, ’2’), (’snake’, ’scales’, ’0’); Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 13 / 1
  • 14. SELECT SELECT * FROM animals; SELECT name, legs FROM animals; SELECT * FROM animals ORDER BY name; SELECT count(*) FROM animals; SELECT SUM(legs) FROM animals; Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 14 / 1
  • 15. UPDATE UPDATE animals SET name = ’kitty’ WHERE name = ’cat’; SELECT * FROM animals; Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 15 / 1
  • 16. Transactions BEGIN; ...your stuff... ...check your stuff with a SELECT... ROLLBACK or COMMIT as desired Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 16 / 1
  • 17. DELETE BEGIN; DELETE FROM animals WHERE legs=2; SELECT * FROM animals; [ROLLBACK or COMMIT] SELECT * FROM animals; Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 17 / 1
  • 18. Exercises - add an animal of your choice - update its name - delete all animals with four legs Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 18 / 1
  • 19. MOAR TABLEZ www.postgresqlguide.com/postgresql-sample-database.aspx Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 19 / 1
  • 20. ERDs - Entity-Relationship Diagrams - Graphical representation of the relations - ...and how they’re connected (JOINed) Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 20 / 1
  • 21. The time has come, the walrus said, to talk of many things. Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 21 / 1
  • 22. Load ’er up! i /home/pdxpug/create_tables.sql i /home/pdxpug/populate_tables.sql Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 22 / 1
  • 23. Working with the sample db - d - what are these seq relations? - d item - s - e Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 23 / 1
  • 24. DISTINCT SELECT fname, lname FROM customer SELECT count(lname) FROM customer; SELECT DISTINCT lname FROM customer; SELECT count(DISTINCT(lname)) FROM customer; Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 24 / 1
  • 25. - PRIMARY vs FOREIGN keys - Natural vs Surrogate keys - JOINs - pset null ’[null]’ Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 25 / 1
  • 26. JOINs SELECT * FROM item; SELECT * FROM stock; SELECT i.description, i.cost_price, i.sell_price, s.quantity FROM item i JOIN stock s ON i.item_id = s.item_id; SELECT i.description, i.cost_price, i.sell_price, s.quantity FROM item i LEFT JOIN stock s ON i.item_id = s.item_id; SELECT i.description, i.cost_price, i.sell_price, s.quantity FROM item i RIGHT JOIN stock s ON i.item_id = s.item_id;Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 26 / 1
  • 27. ...and the dreaded Cartesian JOIN SELECT * FROM item; SELECT * FROM stock; SELECT i.description, i.cost_price, i.sell_price, s.quantity FROM item i, stock s; SELECT i.description, i.cost_price, i.sell_price, s.quantity FROM item i CROSS JOIN stock s; Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 27 / 1
  • 28. VIEWs and TEMP TABLEs CREATE VIEW my_view AS SELECT field FROM table; vs. CREATE TEMP TABLE my_temp_table AS SELECT field FROM table; Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 28 / 1
  • 29. VIEWs and TEMP TABLEs CREATE VIEW view_in_stock AS SELECT i.item_id, i.description, s.quantity FROM item i LEFT JOIN stock s ON i.item_id=s.item_id; SELECT * FROM view_in_stock; try: pset null ’0’ Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 29 / 1
  • 30. subSELECTs SELECT date_placed FROM orderinfo WHERE customer_id IN (SELECT customer_id FROM customer WHERE lname = ’Matthew’); SELECT date_placed FROM orderinfo WHERE customer_id IN (SELECT customer_id FROM customer WHERE (fname, lname) = (’Alex’,’Matthew’)); Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 30 / 1
  • 31. Exercises 1 How many items are currently in stock? 2 In which towns do we have customers? 3 Experiment with RIGHT JOIN with the original sample queries. 4 What are the barcodes for each item? 5 What is the name + total ”our cost” value of each item currently in stock? 6 What is the name + total ”selling cost” value of each item currently in stock? 7 What are the total ”our cost” and ”sell cost” values of all items in stock? 8 How much was shipping on each order? 9 What items were ordered by people with the last name ”Stones”? 10 How much was the total shipping per person? Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 31 / 1
  • 32. Basic Admin - initdb - PGDATA - postgresql.conf - pg hba.conf - stop/start/restart/reload Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 32 / 1
  • 33. Basic Admin - SELECT version(); - CREATE ROLE - backups and upgrades - pg dump, pg dumpall, pg upgrade - logs Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 33 / 1
  • 34. GUI Tools - pHpPgAdmin - pgAdminIII Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 34 / 1
  • 35. Extras - Natural keys vs Surrogate keys - indexes GRANT USAGE ON SCHEMA [schema] TO [otheruser]; GRANT SELECT ON [table] TO [otheruser]; Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 35 / 1
  • 36. Book giveaway! SELECT (random() * 100); Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 36 / 1
  • 37. Where to get help - www.postgresql.org/community/lists/ - #postgresql - PDXPUG Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 37 / 1
  • 38. Reading List www.postgresql.org/docs Manga Guide to Databases Takahashi, Mana Database Design for Mere Mortals Hernandez, Michael J SQL for Smarties Celko, Joe Introduction to Database Systems Date, CJ Relational Model for Database Management Codd, EF Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 38 / 1
  • 39. __ __ / ~~~/ . o O ( Thank you! ) ,----( oo ) / __ __/ /| ( |( ^ /___ / | |__| |__|-" Gabrielle Roth (PDXPUG & FreeGeek) Introduction to Databases with PostgreSQL Nov 9, 2010 39 / 1