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DBISAM Time problem |
Tue, Oct 21 2008 6:50 AM | Permanent Link |
"Carlos" | Hi
I have to memorize the durations hours a mint of an event and save in a field of type TIME. Then I must add all the hours recorded in another table. How can I do? I tried to use in the second table format FLOAT but I have difficulties to successfully add the hours / minutes and store them. Help ! Thanks Carlos |
Tue, Oct 21 2008 7:42 AM | Permanent Link |
Roy Lambert NLH Associates Team Elevate | Carlos
TIME is the wrong type to use to store duration. Two reasons: 1. you would have to be totally, utterly and absolutely certain that the hours portion would never be more then 24 (I think time is stored as milliseconds past midnight) 2. you can't add two times together and get a meaningful result What you need to do is either store a start and stop time so you can calculate the duration of the event or store hours and minutes separately. You could manage something by casting the TIME column splitting out the hours and minutes but it would be a nasty piece of sql. Roy Lambert |
Tue, Oct 21 2008 7:47 AM | Permanent Link |
Rolf Frei eicom GmbH | Time is the wrong fieldtype for your need. I would do a Integer Field and
save the sconds of duration. So you can just fine calculate with it. Regards Rolf "Carlos" <carlos@noemail.com> schrieb im Newsbeitrag news:6589BEF9-22D8-441E-A1DF-74C0CD071A6D@news.elevatesoft.com... > Hi > I have to memorize the durations hours a mint of an event and save in a > field of type TIME. > Then I must add all the hours recorded in another table. > How can I do? > I tried to use in the second table format FLOAT but I have difficulties to > successfully add the hours / minutes and store them. > Help ! > > Thanks > > Carlos > |
Tue, Oct 21 2008 9:07 AM | Permanent Link |
"Carlos" | Specifically:
Should I register the duration of a flight in hours and minutes. For example, two hours and fifteen minutes are 2:15 I must add these hours to a total flight hours to turn a timetable. 1st table three record First flight: 2:15 Second: 1:20 Third: 1:10 2ns table: total record Total hours: 2:15 + 1:20 + 1:10 = 4:45 Thank you Carlos |
Tue, Oct 21 2008 9:58 AM | Permanent Link |
Rolf Frei eicom GmbH | You can do that with minutes just simple:
1st table three record First flight: 135 Second: 80 Third: 70 2ns table: total record in minutes Total minutes: 135 + 80 + 70 = 285 Minutes = 285 div 60 = 4 Hours / 285 mod 60 = 45 Minutes = 4:45 For display you can just simple calculate the hours and minutes like in the sample above. Regards Rolf "Carlos" <carlos@noemail.com> schrieb im Newsbeitrag news:72538364-96A1-430E-A432-B8BC02D659DC@news.elevatesoft.com... > Specifically: > > Should I register the duration of a flight in hours and minutes. > For example, two hours and fifteen minutes are 2:15 > > I must add these hours to a total flight hours > to turn a timetable. > > 1st table three record > > First flight: 2:15 > Second: 1:20 > Third: 1:10 > > 2ns table: total record > > Total hours: 2:15 + 1:20 + 1:10 = 4:45 > > Thank you > > Carlos > |
Tue, Oct 21 2008 10:03 AM | Permanent Link |
Roy Lambert NLH Associates Team Elevate | Carlos
Assuming 1. you're only bothered about to the nearest minute 2. you're going to be using sql not Dephi As Rolf suggests hold the data as a single integer - but minutes rather than seconds To get the total SELECT TRUNC(SUM(duration) / 60) AS HOURS , (duration - 60*(TRUNC(SUM(duration) / 60))) AS MINUTES FROM timetable for a single flight you just don't use SUM Roy Lambert [Team Elevate] |
Tue, Oct 21 2008 10:18 AM | Permanent Link |
"Carlos" | I thank you very much for the answers !!
C. |
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