大约有 31,840 项符合查询结果（耗时：0.0297秒） [XML]
What is an index in SQL?
...es are not unique. I might have a user database and want to query for everyone that lives in Gothenburg. An index on the "city" field would speed up my query. But there are more than 1 user living in Gothenburg so the index must be non-unique.
– Emil Vikström
...
Using Python's os.path, how do I go up one directory?
I recently upgrade Django from v1.3.1 to v1.4.
14 Answers
14
...
What is NoSQL, how does it work, and what benefits does it provide? [closed]
...
What exactly is it?
On one hand, a specific system, but it has also become a generic word for a variety of new data storage backends that do not follow the relational DB model.
How does it work?
Each of the systems labelled with the generic name w...
Library not loaded: /usr/local/opt/readline/lib/libreadline.6.2.dylib
...
This one did it for me on El Capitan
– Sebastian Sastre
Oct 20 '16 at 13:18
6
...
How to overload std::swap()
...re swapping, so that it can be found via argument-dependent lookup (ADL). One particularly easy thing to do is:
class X
{
// ...
friend void swap(X& a, X& b)
{
using std::swap; // bring in swap for built-in types
swap(a.base1, b.base1);
swap(a.base2, b....
When to use Common Table Expression (CTE)
...ould need to use them. They would seem to be redundant as the same can be done with derived tables. Is there something I am missing or not understanding well? Can someone give me a simple example of limitations with regular select, derived or temp table queries to make the case of CTE? Any simple ex...
ListView inside ScrollView is not scrolling on Android
...ome EditTexts in the top part and then a tab host with two tabs which have one ListView each. When the EditText views are focused, the soft keyboard comes up and as I have a ScrollView, the content is scrollable. But the problem comes when there are more items in ListViews (ones in tabs), I am not ...
XDocument or XmlDocument
... I can't find something useful, could you please tell me why you would use one over another ?
7 Answers
...
How to encode the filename parameter of Content-Disposition header in HTTP?
...mple where it fails?
@Dave Van den Eynde: Combining the two file names on one line as according to RFC6266 works except for Android and IE7+8 and I have updated the code to reflect this. Thank you for the suggestion.
@Thilo: No idea about GoodReader or any other non-browser. You might have some lu...
What is the best way to dump entire objects to a log in C#?
...
@GuySoft I suspect one of the properties on your object, or the object itself, is not serializable.
– Bernhard Hofmann
Oct 20 '14 at 9:15
...