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Ways to implement data versioning in MongoDB
...nt contain a dictionary of time-stamped diffs. Something like this:
{
_id : "id of address book record",
changes : {
1234567 : { "city" : "Omaha", "state" : "Nebraska" },
1234568 : { "city" : "Kansas City", "state" : "Missouri" }
}
}
To make...
Cannot create an NSPersistentStoreCoordinator with a nil model
... for me.
– Ben Thomas
Dec 14 '14 at 21:35
this worked for me. Its frustrating and difficult to debug when it works on ...
How do I concatenate two lists in Python?
...is Hilliard
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cartesian product in pandas
... I believe this is the most pandas-like way these days for pandas>=0.21
– shadi
Apr 23 '18 at 6:05
7
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What's wrong with nullable columns in composite primary keys?
...
221
Primary keys are for uniquely identifying rows. This is done by comparing all parts of a key to...
Count number of records returned by group by
...rGroup,
COUNT(*) OVER () AS TotalRecords
from temptable
group by column_1, column_2, column_3, column_4
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How can I generate Unix timestamps?
...is too.
– Dereckson
Nov 5 '17 at 17:21
Note: to add 60 seconds: date -v+60S +%s to add 1 day: date -v+24H +%s and so o...
What does character set and collation mean exactly?
...anguage it's written in.
– Phil
Oct 21 '15 at 12:50
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Numpy: Get random set of rows from 2D array
... to read.
– Pinocchio
Jun 19 '16 at 21:53
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Proper Repository Pattern Design in PHP?
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213
I thought I'd take a crack at answering my own question. What follows is just one way of solvi...