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Extra info for Advanced SQL Database Programmers Handbook
The defining mathematical property of a 42 SQL Database Programmers Handbook continuum is that any part of it can be further sub-divided forever. Give me any line segment and I can cut it into smaller segments endlessly. But we run into the problem that the defining property of a point is that it cannot be further subdivided. So how can there be points in a continuum? When you give a year, say 2000, you are really giving me an interval of 365 days. Give me a date, say 2000-01-01, you are not giving me a point; you are identifying an interval of 24 hours.
I would like to be able to report the number of user sessions logged on during each hour of the day. So, if someone began a session at 03:12 Hrs and ended it at 06:45 Hrs, I would like them to be counted as being logged on the system for 03:00 Hrs, 04:00 Hrs, 05:00 Hrs and 06:00 Hrs. This report should work all the hours in several years of data. One solution proposed in the newsgroup involved using CASE expressions to classify each time extracted from the TIMESTAMP values as to what hourly interval it belongs.
The dividend table must match exactly to the values of the divisor without any extra values. plane) = (SELECT COUNT(plane) FROM Hangar); This says that a pilot must have the same number of certificates as there planes in the hangar and these certificates all match to a plane in the hangar, not something else. The "something else" is shown by a created NULL from the LEFT OUTER JOIN. plane) because it does not work; it will tell you that the hangar has (n) planes in it and the pilot is certified for (n) planes, but not that those two sets of planes are equal to each other.