how to group by and count using MySQL

Question

I have data which looks like this:

ID  post_author post_title  guid
3309    21  Should somebody not yet on SQL 2008 wait for SQL 2008 R2, since it\'s near release?  h         


        

Answer 1

Write a SQL FUNCTION - call it for instance, guid_extract(guid), which extracts the pertinent info, then you can add it to a column in your select::

SELECT stuff, otherstuff, guid_extract(guid) as site
  ...
  GROUP BY site;