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What are rvalues, lvalues, xvalues, glvalues, and prvalues?
...of rvalue, i.e. they're the rvalues that aren't xvalues.
Glvalues are the union of xvalues and lvalues in one group, because they do share a lot of properties in common.
So really, it all comes down to xvalues and the need to restrict movement to exactly and only certain places. Those places are ...
What's the difference between `on` and `live` or `bind`?
...*/ $(".foo").on("click", handler);
Use on like delegate (event delegation rooted in a given element):
/* Old: */ $("#container").delegate(".foo", "click", handler);
/* New: */ $("#container").on("click", ".foo", handler);
Use on like live (event delegation rooted in the document):
/* Old: */ $("...
App Inventor 2 控制代码块 · App Inventor 2 中文网
...否则，执行 否则 块序列中的操作。
下面的动画展示了如何使用 如果，否则 块扩展：
从范围循环
针对从 范围从 开始到 到 结束的范围内的每个数值运行 执行 部分中的块，每次将 变量名 增加 每次增加 ...
Casting interfaces for deserialization in JSON.NET
...d is not the same as its declared type. Note that this doesn't include the root serialized object by default. To include the root object's type name in JSON you must specify a root type object with SerializeObject(Object, Type, JsonSerializerSettings) or Serialize(JsonWriter, Object, Type)." Source:...
Retrieve the maximum length of a VARCHAR column in SQL Server
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for mysql its length not len
SELECT MAX(LENGTH(Desc)) FROM table_name
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How to print SQL statement in codeigniter model
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Fatal error: Call to undefined method CI_DB_mysql_driver::get_compiled_select()
– itskawsar
Sep 25 '13 at 8:53
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Left Join With Where Clause
...worry about JOIN/WHERE in the main query.
Sometimes, this works faster in MySQL, but compare it against the LEFT JOIN form to see what works best for you.
SELECT s.*, c.value
FROM settings s
LEFT JOIN character_settings c ON c.setting_id = s.id AND c.character_id = '1'
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Which is faster in Python: x**.5 or math.sqrt(x)?
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How many square roots are you really performing? Are you trying to write some 3D graphics engine in Python? If not, then why go with code which is cryptic over code that is easy to read? The time difference is would be less than anybody c...
In Gradle, how do I declare common dependencies in a single place?
...roperties, e.g:ext.GROOVY = 'org.codehaus.groovy:groovy-all:2.1.6'. In the root project build.gradle, I include allprojects { apply from: "$rootDir/dependencies.gradle" }. Then all dependencies are defined in one file instead of spreading them around, and more "easy to read" constants are used in t...
Generating Guids in Ruby
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To create a proper, mysql, varchar 32 GUID
SecureRandom.uuid.gsub('-','').upcase
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