hi ther i\'m still working on mysql performance currently i start to check the -log-slow-query command on mysql server.
When I do an explain on my query I see that it has \"Using temporary; Using filesort\" under \"Extra\" for the first row. I understand this is bad but I don\'t know what exac开发者_如何学Ctly it m
I have a table of about 360,000 records and here\'s performing a query on two indexed fields: SELECT COUNT(*)
I\'ve been working with databases for a long time but I\'m new to query optimization. I have the following query (some of it code-generated):
Is there any way in Oracle within an SQL query to reference a column from within a subquery that is outside of it, or to achieve that effect even if via a different means? Everything I\'ve read on the
I have two tables one is keywords [id | keyword | account] k and one is templateKeywordLink [templateId | keywordId] tkl
SELECT * FROM tfdata,linkdata,gndata,serdata WHERE tfdata.web = linkdata.web AND tfdata.web = gndata.web
I have to join 3 tables somewhere on my project. Here is example tables and columns: Table-1 : posts Columns1: id,owner,title,post,keywords
I am trying to force MySQL to use two indexes. I am joining a table and I want to utilize the cross between the two indexes. The specific term is Using intersect and here is a link to MySQL documentat
First I must declare that I\'m an extreme newbie. Have just been using PHP and MySQL for about 4 weeks now. Please accept my apologies in advance if I haven\'t formatted this question correctly or am
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