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Re: Putting it all together [message #186228 is a reply to message #186225]

Sat, 21 June 2014 09:15

gordonb.zp2md
Messages: 1
Registered: June 2014

Karma:

Junior Member

> Why would anyone store a date in a MySQL
> database using any data type other than DATE or DATETIME?

Believe it or not, there are (very rarely) good reasons to do that.

Genealogy is one example. It has lots of dates MySQL won't accept.
First, some people (such as English royalty) can trace their ancestry
back before 1000 A.D., before the limit on the DATE type. Second,
MySQL doesn't like imprecise dates, such as only a year being known.
Third, during a time when both the Julian and Gregorian calendars
were in use, depending on location, you often see dates recorded
as "5 January 1712/13" or "5 January 1712/3". You might also see
"5 January 1712".

Since the Julian calendar as used in the English colonies that later
became the United States used March 25 as the first day of the year,
you can get ridiculous-looking records such as a child born: March
27, 1700, died: March 23, 1700 (not a mistake: the child lived
almost a full year) and born: March 24, 1700, died: March 25, 1701
(the child lived about 24 hours). Also, a date recorded as "the
6th day of the third month of 1699" might be referring to March or
May.

It may be best to treat all dates (birth, death, marriage, graduation,
etc.) as ranges. These should be DATE types for efficient sorting
and date arithmetic. It's also important to record the date(s) as
stated in the source(s) as originally recorded, complete with
accurate reproduction of spelling errors and in the original language,
in text fields (or perhaps as an image). This is not redundant.
You may have to do considerable research to set the DATE fields
from the original source data that may be conflicting, imprecise,
or ambiguous. You might need to try extening the Gregorian calendar
backwards to avoid death before birth and other anomalies.

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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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