大约有 42,000 项符合查询结果（耗时：0.0590秒） [XML]
How can I define a composite primary key in SQL?
...te primary key. It is defined as follows:
CREATE TABLE voting (
QuestionID NUMERIC,
MemberID NUMERIC,
PRIMARY KEY (QuestionID, MemberID)
);
The pair (QuestionID,MemberID) must then be unique for the table and neither value can be NULL. If you do a query like this:
SELECT * FROM voting WHER...
What's the meaning of * (asterisk) in XAML ColumnDefinition?
...
When you define a column in a WPF grid you can set the width to one of three possible values:
A fixed width,
Auto – column will become as wide as necessary to fit its children, or
* (star) take up any available remaining space
The * is prefixed by a numbe...
Margin-Top not working for span element?
...e div, p 1 which are Block Level elements which can take up margin on all sides,span2 cannot as it's an Inline element which takes up margins horizontally only.
From the specification:
Margin properties specify the width of the margin area of a box. The
'margin' shorthand property sets the ma...
jQuery UI slider Touch & Drag/Drop support on Mobile devices
I have already styled and implemented jQuery UI slider into a project. Though it's responsive, the slider does not respond to being touched and dragged. Instead, you have to touch where you want the slider to go. I'd like to avoid swapping to jQuery mobile UI, which supports touching and dragging, s...
How to get one value at a time from a generator function in Python?
...these end up calling a specially named function, next(), which can be overridden by subclassing. In Python 3, however, this function has been renamed to __next__(), to be consistent with other special functions.
share
...
How to create a listbox in HTML without allowing multiple selection?
...t5</option>
</select>
To clarify, adding the size attribute did not remove the multiple selection.
The single selection works because you removed the multiple="multiple" attribute.
Adding the size="5" attribute is still a good idea, it means that at least 5 lines must be displayed. S...
Strip Leading and Trailing Spaces From Java String
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
Using print statements only to debug
...e me write a lot of print statements to verify if it's all going right and identify the points of failure. But, generally, outputting so much information is not a good practice. How do I use the print statements only when I want to debug and let them be skipped when I don't want them to be printed? ...
renamed heroku app from website, now it's not found
...an 20 '13 at 23:28
Moh Hasbi AssidiqiMoh Hasbi Assidiqi
6111 silver badge11 bronze badge
...
Take all my changes on the current branch and move them to a new branch in Git
...
@PaulLynch considering those commits (on master) that should be on edge are on master, yes. I have edited the answer.
– VonC
Mar 20 '13 at 6:15
...