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  1. PO
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    <p>Change the subselects into joins, as such:</p> <pre><code>select FROM_UNIXTIME(P.time,'%Y-%m-%d') AS 'DATE', count(distinct p30.page_id) AS '30D', count(distinct p60.page_id) AS '60D', count(distinct p90.page_id) AS '90D' from perflog p join perflog p30 on FROM_UNIXTIME(p30.time,'%Y-%m-%d') BETWEEN DATE_SUB(FROM_UNIXTIME(P.time,'%Y-%m-%d'), INTERVAL 30 DAY) AND FROM_UNIXTIME(P.time,'%Y-%m-%d') join perflog p60 on FROM_UNIXTIME(p60.time,'%Y-%m-%d') BETWEEN DATE_SUB(FROM_UNIXTIME(P.time,'%Y-%m-%d'), INTERVAL 60 DAY) AND FROM_UNIXTIME(P.time,'%Y-%m-%d') join perflog p90 on FROM_UNIXTIME(p90.time,'%Y-%m-%d') BETWEEN DATE_SUB(FROM_UNIXTIME(P.time,'%Y-%m-%d'), INTERVAL 90 DAY) AND FROM_UNIXTIME(P.time,'%Y-%m-%d') </code></pre> <p>However, that's likely to run slowly because of the pile of functions killing any indicies on your date columns, a better solution might be:</p> <pre><code>create temporary table perf_tmp as select FROM_UNIXTIME(P.time,'%Y-%m-%d') AS 'VIEWDATE', page_id from perflog; create index perf_dt on perf_tmp (VIEWDATE); select VIEWDATE, count(distinct p30.page_id) AS '30D', count(distinct p60.page_id) AS '60D', count(distinct p90.page_id) AS '90D' from perf_tmp p join perf_tmp p30 on p30.VIEWDATE BETWEEN DATE_SUB(P.VIEWDATE, INTERVAL 30 DAY) AND p.VIEWDATE join perf_tmp p60 on p60.VIEWDATE BETWEEN DATE_SUB(P.VIEWDATE, INTERVAL 60 DAY) AND p.VIEWDATE join perf_tmp p90 on p90.VIEWDATE BETWEEN DATE_SUB(P.VIEWDATE, INTERVAL 90 DAY) AND p.VIEWDATE; </code></pre>
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    1. POMySQL: Rewrite MSSQL with correlated subquery in FROM clause?
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    1. USDonnie
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    1. COThanks Donnie. The query is running now... for about 5 minutes. :( I'll wait it out and see if it returns the expected/desired data.
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    2. COThe likely problem is the fact that you're being forced to wrap all of the dates in function calls. This means that it can't use indices on those fields and you end up doing a ton of table scans. If you can find a way around that your perf will go way up.
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    3. COSomething isn't quite right. We're still executing after ~30 minutes.
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