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postgresql COUNT(DISTINCT …) very slow
...UNT(DISTINCT()) performs sorting, it will be definitely helpful to have an index on the column_name especially with relatively small amount of work_mem (where hashing will produce relatevely large amount of batches). Since that, it's not always bad to use COUNT (DISTINCT()_, isn't?
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ASP.NET Web Site or ASP.NET Web Application?
...antly, it will come up with new names for the DLL files generated by pages all the time. That can lead to having several close copies of DLL files containing the same class name,
which will generate plenty of errors. The Web Site project was introduced with Visual Studio 2005, but it has turned o...
TaifunPlayer 扩展（Audio Player）：音频播放器扩展，支持流媒体播放控制 ...
...原作者为 Taifun。
原始网址：https://puravidaapps.com/player.php
文档翻译和整理：AI2中文网
您的改进建议 联系方式： 不需要回复的可留空~ 意见反馈（300字以内）： 给个鼓励...
What data type to use for hashed password field and what length?
...l be unique per user. However, any known salt makes the hash cryptographically weaker than if there were no known salt. A salt only adds value if it is also unknown.
– fijiaaron
May 18 '12 at 13:39
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How can I reverse a list in Python?
...ion
size = len(lst) # Get the length of the sequence
hiindex = size - 1
its = size/2 # Number of iterations required
for i in xrange(0, its): # i is the low index pointer
temp = lst[hiindex] # Perform a classic swap
lst[hiindex] = lst...
Inserting HTML into a div
...t;/li></ol>';
Keep in mind that innerHTML is not accessable for all types of tags when using IE. (table elements for example)
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How do I programmatically set the value of a select box element using JavaScript?
...
Not answering the question, but you can also select by index, where i is the index of the item you wish to select:
var formObj = document.getElementById('myForm');
formObj.leaveCode[i].selected = true;
You can also loop through the items to select by display value with a loop:...
Node.js vs .Net performance
...om the given url
/// </summary>
private void DownloadUrl(int index, string url)
{
using (WebClient client = new WebClient())
{
try
{
int start = Environment.TickCount;
byte[] data = client.DownloadData(url);
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Handlebars/Mustache - Is there a built in way to loop through the properties of an object?
...d for external helpers.
How to use it
For arrays:
{{#each myArray}}
Index: {{@index}} Value = {{this}}
{{/each}}
For objects:
{{#each myObject}}
Key: {{@key}} Value = {{this}}
{{/each}}
Note that only properties passing the hasOwnProperty test will be enumerated.
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jQuery parent of a parent
...ncestors that match the selector
and the :eq(1) says find the oneth (zero-indexed, so the second) element in the list
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