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Re: Storing dates [message #186252 is a reply to message #186250]

Sat, 21 June 2014 21:33

Tim Streater
Messages: 328
Registered: September 2010

Karma:

Senior Member

In article <lo4sa4$h1p$1(at)dont-email(dot)me>, Jerry Stuckle
<jstucklex(at)attglobal(dot)net> wrote:

> On 6/21/2014 5:06 PM, Tim Streater wrote:
>> In article <XnsA353998B95688dougmilmaccom(at)78(dot)46(dot)70(dot)116>, Doug Miller
>> <doug_at_milmac_dot_com(at)example(dot)com> wrote:
>>
>>> richard <noreply(at)example(dot)com> wrote in
>>> news:hzk4wa449wa$(dot)3xtj0jkxz78o$(dot)dlg(at)40tude(dot)net:
>>>> On Sat, 21 Jun 2014 17:42:29 +0000 (UTC), Doug Miller wrote:
>>>> >> richard <noreply(at)example(dot)com> wrote in
>>>> > news:1mddkhwt2mr0v$.1m6eithcu7iod.dlg@ 40tude.net:
>>>> > >>> As for the date usage on MY database tables, I am only using a
>>>> >> date as a reference.
>>>> > >> Patently false, as you have posted questions here asking for
>>>> > help resolving your problems in sorting by the date.
>>>> > >>> I really don't give a damn what your philosophy or ideals are
>>>> >> behind the so called "proper ways" of obtaining a date.
>>>> > >> Which is exactly *why* you have problems sorting by the date.
>>>> > The problem with sorting is, it treats any value given as a
>>>> string, then determines which has the lowest value in total.
>>>
>>> Yes, I understand that. That results directly from storing dates as
>>> strings,
>>> and is exactly the reason that everyone here has been telling you to
>>> store your dates in a
>>> column that has
>>> the DATE datatype, not CHAR.
>>> Your refusal to follow that advice -- apparently stemming from your
>>> inability
>>> to understand that there even *are* datatypes other than NUMERIC and
>>> CHAR -- is the entire reason you are having this sorting problem.
>>
>> I have a field which contains values like 3.7, 4.2, etc. But when I
>> defined the field (in SQLite) I made it a TEXT field, forgetting that I
>> would need to be able to sort on that field.
>>
>> My workaround is to convert the string to floating at the time of the
>> sort. In SQLite I do:
>>
>> ... ORDER BY ROUND(myfield,1);
>>
>> which works just fine. Richard should look for something similar in
>> mysql.
>
> Why don't you fix your database?
>
> The way you're doing it cannot use an index and will call round() for
> EVERY row in the sort.

I'd have to ask a number of users to convert their data when they next
upgrade the software. Trouble is in SQLite you can't just redefine a
table column to be a different type; ALTER TABLE is somewhat limited.
I'd have to copy the whole table to another, DROP the first one, RENAME
the new one, VACUUM the database to get its size down. OK, it's doable,
but I'm replying on less-than-technically-savvy users to run a Terminal
script on their own machine to effect this change.

In my own use of the app, I've got 65 databases that an update script
would have to find, recursively in an arbitrary folder structure. One
user has 1000. The recursion part is actually easy, that app already
does that at startup to verify that the user hasn't moved some
databases around by hand while the app wasn't running. I just feel a
shade nervous about distant people (i.e., not me) running a one-off
script.

In richard's case, it didn't sound like he has a huge number of rows,
so it struck me that a workaround wouldn't have much of a performance
impact. In mine, the column in question is unlikely to be a popular one
for sorting.

--
"Freedom is sloppy. But since tyranny's the only guaranteed byproduct of
those who insist on a perfect world, freedom will have to do." -- Bigby Wolf

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[Message index]

		Putting it all together By: Mr Oldies on Fri, 20 June 2014 14:20
		Re: Putting it all together By: Evan Platt on Fri, 20 June 2014 15:11
		Re: Putting it all together By: Mr Oldies on Fri, 20 June 2014 15:24
		Re: Putting it all together By: Doug Miller on Fri, 20 June 2014 17:15
		Re: Putting it all together By: Evan Platt on Sat, 21 June 2014 03:01
		Re: Putting it all together By: Jrgen Exner on Fri, 20 June 2014 15:21
		Re: Putting it all together By: Norman Peelman on Sat, 21 June 2014 01:06
		Re: Putting it all together By: Denis McMahon on Sat, 21 June 2014 03:02
		Re: Putting it all together By: Denis McMahon on Sat, 21 June 2014 03:09
		Re: Putting it all together By: Jrgen Exner on Sat, 21 June 2014 03:13
		Re: Putting it all together By: Mr Oldies on Sat, 21 June 2014 03:34
		Re: Putting it all together By: Jrgen Exner on Sat, 21 June 2014 03:48
		Re: Putting it all together By: Evan Platt on Sat, 21 June 2014 04:00
		Re: Putting it all together By: Doug Miller on Sat, 21 June 2014 04:22
		Re: Putting it all together By: Jrgen Exner on Sat, 21 June 2014 05:11
		Re: Putting it all together By: Evan Platt on Sat, 21 June 2014 05:39
		Re: Putting it all together By: gordonb.zp2md on Sat, 21 June 2014 09:15
		Storing dates (was: Putting it all together) By: Thomas 'PointedEars' on Sat, 21 June 2014 10:15
		Re: Storing dates By: Mr Oldies on Sat, 21 June 2014 15:10
		Re: Storing dates By: Doug Miller on Sat, 21 June 2014 17:42
		Re: Storing dates By: Mr Oldies on Sat, 21 June 2014 18:28
		Re: Storing dates By: Jrgen Exner on Sat, 21 June 2014 19:04
		Re: Storing dates By: Doug Miller on Sat, 21 June 2014 19:06
		Re: Storing dates By: Tim Streater on Sat, 21 June 2014 21:06
		Re: Storing dates By: Jerry Stuckle on Sat, 21 June 2014 21:09
		Re: Storing dates By: Tim Streater on Sat, 21 June 2014 21:33
		Re: Storing dates By: Jerry Stuckle on Sat, 21 June 2014 21:49
		Re: Storing dates By: Thomas 'PointedEars' on Sun, 22 June 2014 12:38
		Re: Storing dates By: Jrgen Exner on Sat, 21 June 2014 21:31
		Re: Storing dates By: Tim Streater on Sat, 21 June 2014 21:44
		Re: Storing dates By: Thomas 'PointedEars' on Sun, 22 June 2014 12:59
		Re: Storing dates By: Denis McMahon on Sat, 21 June 2014 23:19
		Re: Storing dates By: Arno Welzel on Sun, 22 June 2014 06:53
		Re: Storing dates By: Erick T. Barkhuis on Sun, 22 June 2014 08:03
		Re: Storing dates By: Jerry Stuckle on Sun, 22 June 2014 13:29
		Re: Storing dates By: Erick T. Barkhuis on Sun, 22 June 2014 14:24
		Re: Storing dates By: Jerry Stuckle on Sun, 22 June 2014 14:32
		Re: Storing dates By: Erick T. Barkhuis on Sun, 22 June 2014 14:45
		Re: Storing dates By: Denis McMahon on Sun, 22 June 2014 19:44
		Re: Storing dates By: Jrgen Exner on Sun, 22 June 2014 15:26
		Re: Storing dates By: gordonb.q26od on Sun, 22 June 2014 15:00
		Re: Storing dates By: Arno Welzel on Sun, 22 June 2014 14:47
		Re: Storing dates By: Mr Oldies on Sun, 22 June 2014 17:55
		Re: Storing dates By: Jrgen Exner on Sun, 22 June 2014 19:31
		Re: Storing dates By: Thomas 'PointedEars' on Tue, 24 June 2014 20:27
		Re: Storing dates By: Denis McMahon on Sun, 22 June 2014 19:52
		Re: Storing dates By: Arno Welzel on Sun, 22 June 2014 19:52
		Re: Storing dates By: Mr Oldies on Sun, 22 June 2014 18:05
		Re: Storing dates By: Arno Welzel on Sun, 22 June 2014 19:56
		Re: Storing dates By: Mr Oldies on Mon, 23 June 2014 02:46
		Re: Storing dates By: Arno Welzel on Mon, 23 June 2014 06:11
		Re: Storing dates By: Mr Oldies on Mon, 23 June 2014 06:37
		Re: Storing dates By: Arno Welzel on Mon, 23 June 2014 09:10
		Re: Storing dates By: Evan Platt on Mon, 23 June 2014 13:50
		Re: Storing dates By: Mr Oldies on Mon, 23 June 2014 15:13
		Re: Storing dates By: Evan Platt on Mon, 23 June 2014 16:13
		Re: Storing dates By: Arno Welzel on Mon, 23 June 2014 20:33
		Re: Storing dates By: Mr Oldies on Mon, 23 June 2014 03:04
		Re: Storing dates By: Arno Welzel on Mon, 23 June 2014 06:12
		Re: Storing dates By: Geoff Muldoon on Mon, 23 June 2014 06:45
		Re: Storing dates By: Mr Oldies on Mon, 23 June 2014 11:58
		Re: Storing dates By: Jrgen Exner on Mon, 23 June 2014 16:50
		Re: Storing dates By: Christoph Michael Bec on Mon, 23 June 2014 17:02
		Re: Storing dates By: Geoff Muldoon on Tue, 24 June 2014 02:00
		Re: Storing dates By: Thomas 'PointedEars' on Tue, 24 June 2014 20:38
		Re: Storing dates By: Jrgen Exner on Sun, 22 June 2014 22:30
		Re: Storing dates By: Peter H. Coffin on Mon, 23 June 2014 01:10
		Re: Putting it all together By: Jrgen Exner on Sat, 21 June 2014 10:34
		Re: Putting it all together By: Denis McMahon on Sat, 21 June 2014 10:23
		Re: Putting it all together By: bill on Sat, 21 June 2014 11:03
		Re: Putting it all together By: Denis McMahon on Sat, 21 June 2014 15:11
		Re: Putting it all together By: Peter H. Coffin on Sat, 21 June 2014 15:57
		Re: Putting it all together By: Arno Welzel on Sun, 22 June 2014 06:45

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