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Database Design: Daily Average For Each Month?
I have a few locations that I take the temperature of every day at noon. They are fairly consistent and each day will be the same as the previous day for the most part. What's the best way to set up the database to keep track of each day and then get the daily average for the month?
I could just do have an entry for every day, but I am looking to increase the number of locations. I could easily get to several thousand. Since the majority of the days will be the same, could I just input the date and the temperature on days where it does not match the previous day? If I had day 1, 15, and 29, that would mean day 1 through 14 were the same, 15 through 28 were the same, and 29-31 were the same.
Doing it that way may save space, but I don't know how I would actually get the daily average. The major problem would be figuring out how many days are in the month. Then I would have to figure out how many days were at each temperature. I don't think I could do all that in one SQL query. Is the amount of space I give up worth it to make the computing easier?
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by: angelIIIPosted on 2007-08-26 at 22:08:48ID: 19773781
>could I just input the date and the temperature on days where it does not match the previous day?
no, that will make the average calculations very difficult.
>how many days are in the month.
you can compute easily the last day of the month, by getting the first of next month and substract 1 day.
in mysql, there is even easier.
nevertheless, you can do this:
set up a trigger on the table, which adds the value to a total for the month in another table, and also increases the counter by 1.
the average will then simply be the total/counter, for that month.
the SQL hint to be given is the INSERT ... ON DUPLICATE KEY:
http://dev.mysql.com/doc/r
so, you try to INSERT a row with the year/month/location info, which is the key, and if it exists, you can update the existing row...