Your SlideShare is downloading. ×
0
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
Introduction to PostgreSQL
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

2,570

Published on

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

  • Be the first to like this

No Downloads
Views
Total Views
2,570
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
69
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

×