This document discusses Yahoo! Query Language (YQL) which allows users to query and manipulate data from various web services and online data sources. It covers how to structure YQL queries, available data tables, open data tables that allow users to expose their own APIs or data, and YQL Execute which allows running server-side JavaScript code. The goal of YQL is to help developers build adaptive applications by accessing online data through a simple SQL-like interface.

1. Constructing "SELECT *
FROM Internet" Payment
Tools
Using the Yahoo! Query Language

2. 2

3. 1. Delivering Upsell Content from YQL Data
Sources
1. Driving Traffic Back to Your Services with
Open Data Tables
1. Mashing up Multiple Data Sources with
Server-Side JavaScript
What We’ll Learn
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4. 4

5. 5

6. Making Queries
SELECT * FROM Internet
6

7. YQL Test Console
Available At: http://developer.yahoo.com/yql/console
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8. SELECT myColumn, myTitle
FROM myTable(0, 50)
WHERE myColumn = 'value' AND myTitle = 'title'
LIMIT 3 OFFSET 10 |
sort(field='myColumn') | reverse()
Running Queries - SELECT Query Structure
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9. Modify Data on the Internet
Create Tweets, Add Blog Entries, Update Databases
Current Tables Using I/U/D
Twitter Status, bit.ly URL Shortner, Yahoo! Profile Status
/ Update
Stream, Amazon
SimpleDB
Running Queries - INSERT / UPDATE / DELETE
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10. SELECT * FROM flickr.photos.search
WHERE (lat, lon)
IN (SELECT centroid.latitude, centroid.longitude FROM
geo.places WHERE text="SFO")
Running Queries – Sub-selects with the IN clause
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11. Running Queries – Available Tables
YQL Command: SHOW Tables
Number of Standard Tables: 169
Number of Community Tables: 771
Total Number of Tables: 940
Contribute Tables to:
http://www.github.com/yql/yql-tables/
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12. Running Queries – Table Syntax
YQL Command: DESC tablename
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13. http://query.yahooapis.com/v1/yql?[params]
http://query.yahooapis.com/v1/public/yql?[params]
Params
• q=[QUERY]
• format=[XML / JSON]
• diagnostics=[true / false]
• debug=[true / false]
• callback=[function name]
Running Queries – URL Format
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14. http://query.yahooapis.com/v1/yql?[params]
http://query.yahooapis.com/v1/public/yql?[params]
Params
• q=[QUERY]
• format=[XML / JSON / JSONP / JSONP-X]
• diagnostics=[true / false]
• debug=[true / false]
• callback=[function name]
Running Queries – URL Format
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15. 15
Driving Traffic Back to your Services

16. YQL Open Data Tables
Wrap Your Own API or Data Source
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17. <?xml version="1.0" encoding="UTF-8"?>
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta></meta>
<bindings></bindings>
</table>
Open Data Tables – XML File Syntax
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18. <?xml version="1.0" encoding="UTF-8"?>
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta></meta>
<bindings></bindings>
</table>
Open Data Tables – XML File Syntax
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19. <?xml version="1.0" encoding="UTF-8"?>
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta>
<author>Jonathan LeBlanc</author>
<description>My Table</description>
<documentationURL>www.site.com</documentationURL>
<sampleQuery>SELECT * FROM {table} </sampleQuery>
</meta>
<bindings></bindings>
</table>
Open Data Tables – XML File Syntax
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20. <?xml version="1.0" encoding="UTF-8"?>
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta></meta>
<bindings></bindings>
</table>
Open Data Tables – XML File Syntax
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21. <table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta></meta>
<bindings>
<select itemPath="" produces="XML" >
<urls>
<url env="all”>http://www.site.com/{user}</url>
</urls>
<inputs>
<key id="user" type="xs:string" paramType="path"
required="true" /> </inputs>
</select>
</bindings>
</table>
Open Data Tables – XML File Syntax
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22. The USE clause
USE "http://alavilli.com/yql/paypal_txn_table.xml"
AS paypal_txn_table;
SELECT * FROM paypal_txn_table
WHERE StartDate="2010-06-12T00:00:00.000Z"
AND APIUsername="xxx" AND APIPassword="xxx"
AND Signature="xxx"
Open Data Tables – Invoking a Table Definition
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23. New PayPal Tables!
Available At: http://github.com/yql/yql-tables
Transaction Search: paypal/paypal.transaction.xml
Transaction Details: paypal/paypal.transactions.details
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25. 25
Mapping Social Data to Products
Location
Interests
Profession
Friends
Birthday /
Anniversary
Regional Products
Product Suggestions
Specialty Merchandise
Suggest to Friends
Seasonal / Targeted
Products

26. YQL Execute
Extending Open Data Tables
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27. Augment data
Collect geographic data based on a free-form text location
Create APIs from web pages
Build your very own ScrAPI
Data Transformations
Convert the results from xml to Google's kml format
Move business logic of your application to the cloud
YQL Execute – XML File Syntax
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28. <?xml version="1.0" encoding="UTF-8"?>
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta></meta>
<bindings>
<select itemPath="" produces="XML" >
<urls></urls>
<inputs></inputs>
</select>
</bindings>
</table>
YQL Execute – XML File Syntax
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29. <?xml version="1.0" encoding="UTF-8"?>
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta></meta>
<bindings>
<select itemPath="" produces="XML" >
<urls></urls>
<inputs></inputs>
<execute></execute>
</select>
</bindings>
</table>
YQL Execute – XML File Syntax
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30. <execute>
<![CDATA[
var arrQueries = inputs['query'].split('|');
var elQueries = <queries/>;
.
.
.
]]>
</execute>
YQL Execute – XML File Syntax
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31. Global Disaster Alert and Coordination System
Table
Available At: http://github.com/yql/yql-tables
Under gdacs/gdacs.current.xml
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32. Build adaptive applications faster
(and that run faster)
Conclusion
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33. YQL Documentation
http://developer.yahoo.com/yql
YQL Console
http://developer.yahoo.com/yql/console
YQL Github Account (Contribute Tables)
http://github.com/yql/yql-tables
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34. Thank You
Questions?
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