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How do I filter query objects by date range in Django?
... @dcordjer: Additinally should be said that __range includes the borders (like sql's BETWEEN), if you don't want the borders included you would have to go with my gt/lt solution...
– Bernhard Vallant
Jan 12 '11 at 12:28
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css z-index lost after webkit transform translate3d
... So in "preserve-3d" mode we gotta use z-axis of transform to set order, and in flat mode we should use z-index. The bug is that z-index on safari is broken in combination with HW accelerated transforms.
– Steven Lu
Jan 27 '13 at 17:56
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how do I query sql for a latest record date for each user
... date,
value,
row_number() over(partition by username order by date desc) as rn
from
yourtable
) t
where t.rn = 1
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What does “O(1) access time” mean?
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You're going to want to read up on Order of complexity.
http://en.wikipedia.org/wiki/Big_O_notation
In short, O(1) means that it takes a constant time, like 14 nanoseconds, or three minutes no matter the amount of data in the set.
O(n) means it takes an amo...
Sort ArrayList of custom Objects by property
... above the other answer is beyond me. This link may also be useful: Object Ordering Tutorial at Sun.com.
– BalusC
May 6 '10 at 21:26
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Traverse a list in reverse order in Python
...y the list use alist.reverse(); if you need a copy of the list in reversed order use alist[::-1].
– jfs
Feb 9 '09 at 19:27
97
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Database sharding vs partitioning
...itioning. Partition pruning can often improve query performance by several orders of magnitude. For example, suppose an application contains an Orders table containing a historical record of orders, and that this table has been partitioned by week. A query requesting orders for a single week would o...
Metadata file '.dll' could not be found
...boxes are checked, uncheck them, check again and try to build again.
Build Order and Project Dependencies:
Go to 'Solution Explorer'. Right click on Solution. Go to 'Project Dependencies...'. You will see two tabs: 'Dependencies' and 'Build Order'. This build order is the one in which solution buil...
When/Why to use Cascading in SQL Server?
...onship can involve an exclusive "is part of" description. For example, an OrderLine record is part of its parent order, and OrderLines will never be shared between multiple orders. If the Order were to vanish, the OrderLine should as well, and a line without an Order would be a problem.
The canonic...
The type 'string' must be a non-nullable type in order to use it as parameter T in the generic type
Why do I get Error "The type 'string' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'System.Nullable'"?
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