Thanks for the reply. I understand. I am going to do some
experimenting just to make sure...
Regards,
-Bill
On 9/15/2013 3:13 PM, Petite Abeille wrote:
On Sep 15, 2013, at 8:31 PM, William Drago <wdr...@suffolk.lib.ny.us> wrote:
Thanks for the reply. Seconds since the epoch does make a good timestamp. Is
that what is normally used to extract data between time periods?
(Date & Time seems to be a popular topic at the moment)
There is nothing prescriptive in using epoch time.
As SQLite doesn't have a dedicated date type, you are free to decide how you
want to handle it.
There are two main encoding:
(1) As a number: Julian date, unix epoch, etc
(2) As a string: ISO 8601 & co.. Just make sure that your string representation
sorts properly.
http://www.sqlite.org/lang_datefunc.html
The granularity of the date is up to you as well: day, hour, milliseconds, etc.
This is more driven by what's convenient for your application. Ditto if this should
be split between date & time.
Depending on the task at hand, you could even require a much more full fledge
set of entities:
create table if not exists date
(
id integer not null constraint date_pk primary key,
year integer not null,
month integer not null,
day integer not null,
day_of_year integer not null,
day_of_week integer not null,
week_of_year integer not null,
constraint date_uk unique( year, month, day )
)
create table if not exists time
(
id integer not null constraint time_pk primary key,
hour integer not null,
minute integer not null,
second integer not null,
constraint time_uk unique( hour, minute, second )
)
And then there are timezones, etc…
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