Re: Complex query - need advise
Posted by:
Rick James
Date: November 05, 2012 11:12AM
As I read the query, it generates only 1 row of output. The Date and CampaignName are constants throughout? Will the subquery trick work for a broader query?
Another tip:
Store your Dates as DATE datatype. That is, rearrange d-m-Y into Y-m-d during INSERT. Then, don't hid columns in functions, at least when they are in an index:
AND date_format(str_to_date(mm.`Date`, '%d-%m-%Y'), '%Y-%m-%d') = '2012-10-29')
-->
AND `Date` >= '2012-10-29'
AND `Date` < '2012-10-29' + INTERVAL 1 DAY
Those would allow you to take advantage compound indexes involving Date, and would allow ranges a better chance of being optimized.
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Re: Complex query - need advise
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