sql - how to group by and count using MySQL -

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I have data that looks like this: 

 ID post_author post_title guid 330 9 21 what Should not anyone have yet to wait for SQL 2008 SQL 2008 R2, because this release is near? Http://sql.stackexchange.com/questions/379/should-somebody-not-yet-on-sql-2008-wait-for-sql-2008-r2-since-its-near-release1695 429 How We Do Can you naturally drop the advice of well meaning from sleep? Http://moms4mom.stackexchange.com/questions/1208/how-do-we-politely-decline-well-meaning-advice-from-the-grandmother 553 How to Become a Great Father Read books http: // moms4mom .stackexchange.com / question / 1042 / book-on-how-of-one-great-papa 160 30 Creating a Ice Hockey Net Camera http://photo.stackexchange.com/questions/8/building-an- Ice-hockey-net-cam 159 30 General Professional Photo Release Form http://photo.stackexchange.com/questions/4/generic-commercial-photo-release-form

I need to make a query This group is on the part of the GUID field (Route URL) and data on the prefix POST_AUTHOR counts to be.

The result I am looking for will be like this:

The Site Count of http://sql.stackexchange.com http://moms4mom.stackexchange.com 2 http: / /photo.stackexchange.com 2

If someone helps me in building SQL then I would be grateful. 

  SELECT COUNT (POST_AUTHOR) as AUTHOR_COUNT, by the GUI D FROM TABLE_NAME group GUID < / Code>

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