大约有 37,000 项符合查询结果（耗时：0.0460秒） [XML]
what is faster: in_array or isset? [closed]
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@Fabrizio - Read up on hashing functions and hash tables.
– David Harkness
Nov 20 '12 at 22:54
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show 5 more commen...
Get second child using jQuery
...As in $(t).find('td').eq(1) to get the second <td>, if t was, say, a table and I needed to look down more than 1 node?
– Justin L.
Sep 8 '16 at 1:05
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Tactics for using PHP in a high-load site
...lize your schemas. This means that rather than to have multiple relational tables, you should instead opt to have one big table. In general, joins are a waste of precious DB resources because doing multiple prepares and collation burns disk I/O's. Avoid them when you can.
The trade-off here is ...
EF Code First foreign key without navigation property
...public override void Up()
{
// other stuff...
AddForeignKey("ChildTableName", "ParentId", "ParentTableName", "Id",
cascadeDelete: true); // or false
CreateIndex("ChildTableName", "ParentId"); // if you want an index
}
Running this migration (update-database on package manage c...
Is floating-point math consistent in C#? Can it be?
...types uint and ulong.
As suggested in another answer, you can use lookup tables, where each element in the table is a binary fixed point number, to help implement complex functions such as sine, cosine, square root, and so on. If the lookup table is less granular than the fixed point number, it is...
What is the difference between related SQLite data-types like INT, INTEGER, SMALLINT and TINYINT?
When creating a table in SQLite3, I get confused when confronted with all the possible datatypes which imply similar contents, so could anyone tell me the difference between the following data-types?
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How can I backup a remote SQL Server database to a local drive?
...ckup and hit next,
In the options it presents to you:
In 2010: under the Table/View Options, change 'Script Data' and 'Script Indexes' to True and hit next,
In 2012: under 'General', change 'Types of data to script' from 'Schema only' to 'Schema and data'
In 2014: the option to script the data is ...
Stretch background image css?
...t to cover the entire cell, then put the content on top of the image.
table {
width: 230px;
}
.style1 {
text-align: center;
height: 35px;
}
.bg {
position: relative;
width: 100%;
height: 100%;
}
.bg img {
display: block;
width: 100%;
height: 100%;
}
.b...
Find a pair of elements from an array whose sum equals a given number
...r=[1,2,1,2,1,2,1,...]. For uniqueness by value, it seems like another hash table keyed by a value-pair would do the trick. Still a nice, compact, elegant answer. +1
– William
Feb 10 '11 at 18:49
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What does “exec sp_reset_connection” mean in Sql Server Profiler? [duplicate]
...llocated memory
owned by the connection
Clears any work or temporary
tables that are created by the
connection
Kills all global cursors owned by the
connection
Closes any open SQL-XML handles that are open
Deletes any open SQL-XML related work tables
Closes all system tables
Clo...