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What .NET collection provides the fastest search
... is the fastest searchable collection" depends on your specific data size, ordered-ness, cost-of-hashing, and search frequency.
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Best practice? - Array/Dictionary as a Core Data Entity Attribute [closed]
...n be handled by Core Data.
Update
As of OS X 10.7, Core Data includes an ordered set type which can be used in place of an array. If you can target 10.7 or later, this is the best solution for ordered (array-like) collections.
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Concatenating multiple text files into a single file in Bash
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Just remember, for all the solutions given so far, the shell decides the order in which the files are concatenated. For Bash, IIRC, that's alphabetical order. If the order is important, you should either name the files appropriately (01file.txt, 02file.txt, etc...) or specify each file in the orde...
Using querySelector with IDs that are numbers
... character that is a hex digit immediately follows the escape sequence, in order to distinguish that character from the escape sequence. See w3.org/TR/CSS21/syndata.html#characters for more details.
– BoltClock♦
May 18 '14 at 13:46
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How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...ize of the key
Lookup can take less than k time if it's not there
Supports ordered traversal
No need for a hash function
Deletion is straightforward
New operations:
You can quickly look up prefixes of keys, enumerate all entries with a given prefix, etc.
Advantages of linked structure:
If th...
When should we call System.exit in Java
...and the shutdown process in java, in addition to the answer above:
In an orderly* shutdown, the JVM first starts all registered shutdown hooks. Shutdown hooks are unstarted threads that are registered with Runtime.addShutdownHook.
JVM makes no guarantees on the order in which shutdown hooks
are st...
MPICH vs OpenMPI
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MPICH supports affinity. wiki.mpich.org/mpich/index.php/…
– Jeff
May 26 '19 at 20:23
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What are the options for storing hierarchical data in a relational database? [closed]
...ere follows an example - taxonomic tree of birds so the hierarchy is Class/Order/Family/Genus/Species - species is the lowest level, 1 row = 1 taxon (which corresponds to species in the case of the leaf nodes):
CREATE TABLE `taxons` (
`TaxonId` smallint(6) NOT NULL default '0',
`ClassId` smallin...
1052: Column 'id' in field list is ambiguous
...nion
(select ID from Design where AccountID = 1 and Rendered = 'True')
order by ID limit 0, 51
Here's the docs for it https://dev.mysql.com/doc/refman/5.0/en/union.html
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GROUP BY with MAX(DATE) [duplicate]
...e FROM (
SELECT train, dest, time,
RANK() OVER (PARTITION BY train ORDER BY time DESC) dest_rank
FROM traintable
) where dest_rank = 1
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