"Many MySQL APIs (such as PHP) allow you to treat the result returned from a SHOW statement as you would a result set from a SELECT; see Chapter 22, APIs and Libraries, or your API documentation for more information. In addition, you can work in SQL with results from queries on tables in the INFORMATION_SCHEMA database, which you cannot easily do with results from SHOW statements. See Chapter 20, The INFORMATION_SCHEMA Database."
You should be able to "refresh" your MERGE table using a programming language. Get a list of the databases, then construct a CREATE TABLE or what have you. >-----Original Message----- >From: Andre Matos [mailto:[EMAIL PROTECTED] >Sent: Friday, November 21, 2008 2:11 PM >To: [EMAIL PROTECTED] >Cc: mysql@lists.mysql.com >Subject: Re: SELECT through many databases > >I was trying to avoid both since the SELECT statement is not fixed. >Time to time, users want different information. > >Thanks, > >Andre > >On 21-Nov-08, at 12:59 PM, Peter Brawley wrote: > >> Andre Matos wrote: >> >> >Today I have 5, but tomorrow I can have 50 and I don't want to >> forget any database. >> >> Do it in an app language or as a PREPARED statement in an sproc. >> >> PB >> >> --- >> >> Andre Matos wrote: >>> Hello, >>> >>> Let's suppose I have 5 database: db1, db2, db3, db4, and db5. They >>> all have the same structure but different data. >>> >>> I would like perform this select >>> >>> SELECT TaskDoneOn, TaskDoneBy >>> FROM {database} >>> WHERE TaskDoneOn IS NOT NULL >>> >>> and collect the data from all 5 database. However, I would like to >>> avoid doing something like this: >>> >>> SELECT TaskDoneOn, TaskDoneBy >>> FROM db1 >>> WHERE TaskDoneOn IS NOT NULL >>> UNION >>> SELECT TaskDoneOn, TaskDoneBy >>> FROM db2 >>> WHERE TaskDoneOn IS NOT NULL >>> UNION >>> SELECT TaskDoneOn, TaskDoneBy >>> FROM db3 >>> WHERE TaskDoneOn IS NOT NULL >>> UNION >>> SELECT TaskDoneOn, TaskDoneBy >>> FROM db4 >>> WHERE TaskDoneOn IS NOT NULL >>> UNION >>> SELECT TaskDoneOn, TaskDoneBy >>> FROM db5 >>> WHERE TaskDoneOn IS NOT NULL >>> >>> >>> Today I have 5, but tomorrow I can have 50 and I don't want to >>> forget any database. >>> >>> Thanks for any help. >>> >>> Andre >>> >>> >>> >>> >>> >>> --------------------------------------------------------------------- >--- >>> >>> >>> Internal Virus Database is out of date. >>> Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus >>> Database: 270.9.0/1777 - Release Date: 11/9/2008 9:53 AM >>> >>> > >-- >Dr. André Matos >[EMAIL PROTECTED] > > > > >-- >MySQL General Mailing List >For list archives: http://lists.mysql.com/mysql >To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] >infoshop.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
