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query cache restrictions

 

hi guys, why we can't cache "union" queries with query cache?
http://www.mysqlperformanceblog.com/2006/07/27/mysql-query-cache/

*Caching full queries only *– Meaning it does not work for subselects,
inline views, parts of the UNION. This is also common missunderstanding.
-- 
Roberto Spadim

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