How to get YQL to only return new content (based on a given date)

Need to know how to get YQL to return only data that's newer tha开发者_如何学Gon a date that I specify.

Thanks

It depends on the Data Table you are querying and the web service that's behind it.

For example, facebook graph allows you to set a since query parameter, and you can map a key on it on your Data Table.

http://graph.facebook.com/search?q=watermelon&since=yesterday

If not, filter on the date element in you results

SELECT * from foo.table WHERE date > "2011-03-11T14:00"

<results>
    <post>
        <title>My title</title>
        <link>my link</link>
        <author>fooman</author>
        <date>2011-03-11T14:09</date>
        <content>lorem ipsum</content>
    </post>
    <post>
        <title>My title</title>
        <link>my link</link>
        <author>fooman</author>
        <date>2011-03-11T15:09</date>
        <content>lorem ipsum</content>
    </post>
</results>

This should work, provided that your dates are formatted in a way that makes alphabetical ordering equivalent to temporal order.

If your query is something like

select title,source,description,date from rss where url in ('somerssfeed.com';, 'somerssfeed.com';) | unique(field="title") | sort(field="date", descending="true")

put the filter before the pipes:

select title,source,description,date from rss where url in ('somerssfeed.com';, 'somerssfeed.com';) and date > "2010-01-01T00:00" | unique(... [snip!]