Re: Checking for schedule conflicts

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Benjamin Smith wrote:
> Given the tables defined below, what's the easiest way to check for schedule
> conflicts?

Assuming you don't count more than once things with the same id, start, and finish:

SELECT COUNT(DISTINCT (s1.event_id||s1.start||s1.finish))
FROM sched s1, sched s2
WHERE s1.date = s2.date AND s1.start >= s2.start
  AND s2.finish <= s2.finish AND NOT s1.ctid = s2.ctid

Add "AND s1.date = $date" as needed.

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Greg Sabino Mullane greg@turnstep.com
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http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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