Yahoo! Query Language (YQL) is an SQL-like query language created by Yahoo! as part of their Developer Network. YQL is designed to retrieve and manipulate data from APIs through a single Web interface, thus allowing mashups that enable developers to create their own applications using Yahoo! Pipes online tool.
Filter RSS feeds
select title, link from rss where url = 'https://www.engadget.com/rss.xml'
Convert CSV to JSON or XML
select * from csv where url='http://download.finance.yahoo.com/d/quotes.csv?s=YHOO,GOOG,AAPL&f=sl1d1t1c1ohgv&e=.csv' and columns='symbol,price,date,time,change,col1,high,low,col2'
Extract HTML via CSS Selectors
SELECT * FROM data.html.cssselect WHERE url='http://www.w3.org/' AND css='ul.theme'
Get AppLinks meta data
SELECT * from applinks WHERE url IN ('movietickets.com', 'pinterest.com')
Parse any XML source
select Status.presence from xml where url = 'http://mystatus.skype.com/pjjdonnelly.xml' and Status.presence.lang = 'en'
Use of the YQL should not exceed reasonable request volume. Access is limited as below: