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#1
January 28th, 2004, 08:22 AM
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Master Mysql Db
Hey Everyone,
Does any one know where the master db for mysql is, and if it has meta data. I need to know this because I am building a search engine based off what google does. Any help would be great.
__________________
Nothing is Everything 
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#2
January 28th, 2004, 08:50 AM
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What do you mean?
Mysql's data files are in the data folder within your mysql directory... but I assume they're encoded somehow for security reasons... perhaps you could explain more?
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#3
January 28th, 2004, 03:53 PM
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how do i join two databases together in a query to search for article_ids? Just the basic query structure would help me. Thanks
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#4
January 28th, 2004, 04:54 PM
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Try this method... I've used it once before on SQLServer, but i'm guessing it's a standard. The method is similar in notation to table.fieldname - you just add the db name in front, and use 2 dots
Code:
SELECT articleid FROM articleDB..articles INNER JOIN someotherDB..someothertable WHERE someotherDB..someothertable.keywords like '%foo%'
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#5
January 28th, 2004, 09:37 PM
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I'm not sure if the two dots (..) would pose a problem in MySQL (I think they would), so just replace them with single quotes... Stumpy's code is bang on.
There's a great tutorial over on Dev Shed that will clear up JOIN issues for you: Understanding SQL Joins
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#6
January 29th, 2004, 07:22 AM
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You can do cross-database joins in mysql 4, but I'm not sure of the syntax. It's probably dbname.tablename.fieldname. Check mysql.com to verify.
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#7
January 29th, 2004, 02:44 PM
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Thanks for everything you guys have been posting so far, but this is far from over. I got it querying both db's now and matching up article_id's. The challenge is now is removing duplicates.
I am creating search method that is a bit different than the norm, i think google does it this way. Basically each table represents a keyword and in that table is an article_id that has that keyword found. Right now i have two tables and in there the word mysql appers. So i would naturally get the same id into my result set twice. Now i have tried the distinct function but that does not seem to work real great. What about a union statement?
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