1. http://www.flickr.com/photos/han_shot_first/6573340265/

2. YQL
1 API to rule them all
http://www.flickr.com/photos/han_shot_first/6573340265/

3. What
• YQL is Yahoo! Query Language
– Web service
– SQL like syntax
– SELECT * FROM internet;

4. What
Unstructured data
Data via YQL

5. Console

6. Console
Tables are here

7. Console
Your query goes here

8. Console
Output is here

9. Console
Take-away URL here

10. Output
• XML
– Human & machine readable
• JSON
– Javascript object notation
– A JS object {}
• Key, value pairs including arrays
– Callback supported
• func_name({“json”:”object”})

11. Output

12. Unstructured data
• Page scrapping
• select content from html where
url="http://in.news.yahoo.com/murray-takes-two-
set-lead-final-against-djokovic-153758871.html"
and xpath='//*[@id="mediaarticlebody"]/div/p[29]’
• Xpath – path to a node in an XML document

13. Unstructured data
• Reading google spreadsheets
• https://docs.google.com/spreadsheet/pub?key=0A
gGxPO1AxEhldFZDNzAzQldLSGp2MzVGVXdlUnI
xeUE&output=csv
• select * from csv where url = ””

14. Why
• Unstructured data
– Yes, YQL is cool. But …
• Why use YQL
– When webservices are already available
• Lets see why, via an example

15. Example – Profile, Flickr
• !YQL
– Get a user profile
• http://social.yahooapis.com/v1/user/{guid}/profile
– Search for photos in flickr
• http://api.flickr.com/services/rest/?method=flickr.ph
otos.search&api_key=…&text=djokovic&format=re
st

16. Example – Profile, Flickr
• YQL
– Get a user profile
• select * from social.profile where guid = me
– Search for photos in flickr
• select * from flickr.photos.search where
api_key="..." and text="san francisco"

17. Examples – Content Analysis

18. Examples – Content Analysis

19. Unstructured data, easy api access.
What else?
http://www.flickr.com/photos/brickultra/7178444546/

20. SQL like… JOINS?
• YQL does not support joins natively
• Supports sub-selects
– Let’s look at an example

21. SQL like… JOINS?
1. Get content from a web page

22. SQL like… JOINS?
2. Identify entities in that content

23. SQL like… JOINS?
3. Search for photos with entity names

24. SQL like… JOINS?
• A small demo
– http://doc1.ydn.gq1.yahoo.com/mybloglog_test/yqljoin.html
– JOINs doesn’t mean single API call
• YQL still makes multiple calls
– Only one IN allowed per select
• Sub-select can also have one IN

25. How? – Devil is in the details
http://www.flickr.com/photos/prodiffusion/8267223638/

26. How to use
• PHP
$yql_query = "select * from answers.getbycategory where
category_id=2115500137";
$yql_url = "http://query.yahooapis.com/v1/public/yql?q=" .
rawurlencode($yql_query) . "&format=json";
$session = curl_init($yql_url);
curl_setopt($session, CURLOPT_RETURNTRANSFER,true);
$json = curl_exec($session);

27. How to use
• Javascript

28. Ask. Answer. Discover
Y! Answers
http://www.flickr.com/photos/funkyporcupine/8290971054/

29. Answers - Tables

30. http://developer.yahoo.com/answers/

31. Where, what’s there and how to reach
Geo
http://www.flickr.com/photos/carthalis/3562768042/

32. Current Location - Ask
• Ask the user

33. Current Location - Ask
• Ask the browser

34. Current Location - Ask

35. Current Location - Sniff
http://isithackday.com/hacks/geo/js-location.html

36. Geocoding

37. Reverse geocoding

38. Woeid
• Where-On-Earth-ID

39. Woeid
SELECT placeTypeName, name FROM geo.places.ancestors WHERE
descendant_woeid = "55925520”
SELECT placeTypeName, name FROM geo.places.ancestors WHERE
descendant_woeid = "55925520”

40. Geoplanet

41. Placemaker

42. Geo Hacks
• http://trendsmap.com/local/india
• http://isithackday.com/hacks/geo/

43. Happy hacking!
Thank You
http://www.flickr.com/photos/brickaholicproductions/5177947158/