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Nick Gauthier
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chapter 6 - shoulders of giants
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‎chapter-6/01-contrib.md‎

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!SLIDE
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# Chapter 6
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## The Shoulders of Giants
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!SLIDE
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# Installation
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## Install postgresql-contrib
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!SLIDE
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# chkpass
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## Encrypted column type designed for passwords
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@@@ bash
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psql database_name -f \
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/usr/share/postgresql/8.4/contrib/chkpass.sql
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!SLIDE
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# chkpass
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@@@ sql
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create table users
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(name varchar(256), password chkpass);
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insert into users
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(name, password) values ('nick', 'monkey');
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select * from users;
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name | password
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------+----------------
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nick | :ggn3QyV4c5VKw
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!SLIDE
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# chkpass
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@@@ sql
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select * from users
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where name = 'nick' and password = 'monkey';
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name | password
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------+----------------
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nick | :ggn3QyV4c5VKw
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(1 row)
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select * from users
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where name = 'nick' and password = 'secret';
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name | password
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------+----------
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(0 rows)
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!SLIDE
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# hstore
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## Store and query hashes
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@@@ bash
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psql database_name -f \
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/usr/share/postgresql/8.4/contrib/hstore.sql
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!SLIDE
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# hstore
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@@@ sql
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create table user_profiles
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(name varchar(256), profile hstore);
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insert into user_profiles (name, profile)
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values
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('nick', '"color"=>"blue", "music"=>"indie"'),
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('joe', '"color"=>"blue", "music"=>"rock"');
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select * from user_profiles;
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name | profile
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------+----------------------------------
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nick | "color"=>"blue", "music"=>"indie"
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joe | "color"=>"blue", "music"=>"rock"
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(2 rows)
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!SLIDE
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# hstore
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@@@ sql
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select * from user_profiles
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where profile::hstore->'color' = 'blue';
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name | profile
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------+-----------------------------------
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nick | "color"=>"blue", "music"=>"indie"
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joe | "color"=>"blue", "music"=>"rock"
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(2 rows)
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select * from user_profiles
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where profile::hstore->'music' = 'rock';
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name | profile
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------+----------------------------------
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joe | "color"=>"blue", "music"=>"rock"
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(1 row)
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!SLIDE
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# ltree
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## Tree structure
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### Examples from PostgreSQL docs (not mine)
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!SLIDE
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# ltree
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@@@ sql
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CREATE TABLE test (path ltree);
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INSERT INTO test VALUES
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('Top'),
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('Top.Science'),
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('Top.Science.Astronomy'),
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('Top.Science.Astronomy.Astrophysics'),
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('Top.Science.Astronomy.Cosmology'),
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('Top.Hobbies'),
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('Top.Hobbies.Amateurs_Astronomy'),
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('Top.Collections'),
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('Top.Collections.Pictures'),
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('Top.Collections.Pictures.Astronomy'),
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('Top.Collections.Pictures.Astronomy.Stars'),
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('Top.Collections.Pictures.Astronomy.Galaxies'),
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('Top.Collections.Pictures.Astronomy.Astronauts');
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!SLIDE
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# ltree
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@@@ sql
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select path from test
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where path <@ 'Top.Science';
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path
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------------------------------------
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Top.Science
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Top.Science.Astronomy
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Top.Science.Astronomy.Astrophysics
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Top.Science.Astronomy.Cosmology
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(4 rows)
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!SLIDE
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# ltree
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@@@ sql
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select path from test
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where path @ 'Astro*% & !pictures@';
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path
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------------------------------------
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Top.Science.Astronomy
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Top.Science.Astronomy.Astrophysics
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Top.Science.Astronomy.Cosmology
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Top.Hobbies.Amateurs_Astronomy
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(4 rows)
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!SLIDE
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# isn
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## EAN13, UPC, ISBN (books), ISMN (music), and ISSN (serials)
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### Auto validation + check bits
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### Auto hyphenation on output
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!SLIDE
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# XML Functions
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## Let's convert post names to tag cloud
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## Based on number of comments
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!SLIDE
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# Setup some data
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@@@ sql
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create table posts
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(id int, name varchar(256), body text);
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create table comments
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(id int, post_id int, body text);
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insert into posts (id, name, body) values
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(1, 'cool code', 'here is some cool code'),
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(2, 'lunch today', 'I ate a sandwich');
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insert into comments (id, post_id, body) values
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(1, 1, 'that is cool'),
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(2, 1, 'pretty sweet'),
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(3, 2, 'sandwiches rule');
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!SLIDE
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# Query our cloud
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@@@ sql
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select posts.name, count(comments.id)
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from posts join comments on
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posts.id = comments.post_id
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group by posts.name;
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name | count
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-------------+-------
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cool code | 2
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lunch today | 1
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(2 rows)
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!SLIDE
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# Output XML
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@@@ sql
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select xmlelement(
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name span,
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xmlattributes(
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count(comments.id) as "data-count"
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),
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posts.name
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)
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from posts join comments
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on posts.id = comments.post_id
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group by posts.name;
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xmlelement
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-----------------------------------------
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<span data-count="1">lunch today</span>
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<span data-count="2">cool code</span>
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(2 rows)
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‎conclusion/conclusion.md‎

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!SLIDE
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# Questions
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### Nick Gauthier (@ngauthier)
4-
### SmartLogic Solutions
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### [http://github.com/ngauthier/knowsql](http://github.com/ngauthier/knowsql)
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### [http://knowsql.heroku.com](http://knowsql.heroku.com)

‎knowsql.css‎

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h1 {
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font-size: 80px;
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}
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h2 {
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font-size: 56px;
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}
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h3 {
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font-size: 40px;
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}
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a, a:hover, a:visited {
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color: #64c8ca;
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}
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‎showoff.json‎

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{"section":"chapter-3"},
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{"section":"chapter-4"},
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{"section":"chapter-5"},
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{"section":"chapter-6"},
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{"section":"conclusion"}
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]
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}

‎sls-209x36.png‎

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‎sls.css‎

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