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ALTER TABLE to add a composite primary key
I have a table called provider . I have three columns called person , place , thing . There can be duplicate persons, duplicate places, and duplicate things, but there can never be a dupicate person-place-thing combination.
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TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...产数据2亿多条导入测试
先建集合，创建3个索引，包括_id共4个索引。
TokuMX 5个多小时导完数据，官方MongoDB 2.2.4版本竟然花了2天2夜多，近58个小时
使用mongostat统计，每分钟取值一个，纵坐标为inserts/s,横坐标为分钟。
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Haskell Type vs Data Constructor
...erstanding type constructors and data constructors. For example, I don't really understand the difference between this:
6 A...
How can I get the application's path in a .NET console application?
...Assembly().Location1
Combine that with System.IO.Path.GetDirectoryName if all you want is the directory.
1As per Mr.Mindor's comment:
System.Reflection.Assembly.GetExecutingAssembly().Location returns where the executing assembly is currently located, which may or may not be where the assembl...
Is it possible to set the equivalent of a src attribute of an img tag in CSS?
...urse you can use padding-left /
padding-top to make rectangular images.
Finally, the new image is put there using background.
If the new background image is too large or too small, I recommend using background-size for example: background-size:cover; which fits your image into the allotted space.
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Original purpose of ? [closed]
...purpose today because HTTP as we know it today is still, at least fundamentally, a stateless protocol.
This use case was actually first described in HTML 3.2 (I'm surprised HTML 2.0 didn't include such a description):
type=hidden
These fields should not be rendered and provide a means for servers t...
Official reasons for “Software caused connection abort: socket write error”
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@rustyx All three sources cited here state that it is produced by ACK failures. If you have a source for your own claim please cite it.
– Marquis of Lorne
May 27 '15 at 5:52
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How do I use InputFilter to limit characters in an EditText in Android?
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actually it doesn't work as well in newer Androids (like 4.0+). They introduce dictionary suggestions above the keyboard. When you type a common word (let's say "the") followed by an illegal character for this filter (say, "-"), ...
In Go's http package, how do I get the query string on a POST request?
...ooking for is the POST data as submitted by an HTML form, then this is (usually) a key-value pair in the request body. You're correct in your answer that you can call ParseForm() and then use req.Form field to get the map of key-value pairs, but you can also call FormValue(key) to get the value of a...
Installing PG gem on OS X - failure to build native extension
It seems many others have had problems installing the pg gem. None of the solutions posed for others have worked for me.
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