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Are foreign keys really necessary in a database design?
... at the data level. They also improve performance because they're normally indexed by default.
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int a[] = {1,2,}; Weird comma allowed. Any particular reason?
...or not, and you can reorder lines without fiddling about with commas. Basically it means there's a uniformity in how you treat the lines.
Now think about generating code. Something like (pseudo-code):
output("int a[] = {");
for (int i = 0; i < items.length; i++) {
output("%s, ", items[i]);
...
App Inventor 2 视频播放器教程 - VideoPlayer组件与WebView嵌入播放 · App Inventor 2 中文网
...放？
使用 List（列表）存储多个视频源，通过 Index 变量控制当前播放的视频：
global 视频列表 = make_list(
"https://example.com/video1.mp4",
"https://example.com/video2.mp4",
"https://example.com/video3.mp4"
)
global 当前索引 = 1
when Screen1.I...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
...e stored in 1 or 2 bytes. However: "When sending a key to the handler for index_read() or records_in_range, we always use a 2-byte length for the VARCHAR to make things simpler." See forge.mysql.com/wiki/MySQL_Internals_MyISAM
– Bill Karwin
Feb 12 '11 at 18:5...
Drawing a dot on HTML5 canvas [duplicate]
...ne the value of a pixel //
function drawPixel (x, y, r, g, b, a) {
var index = (x + y * canvasWidth) * 4;
canvasData.data[index + 0] = r;
canvasData.data[index + 1] = g;
canvasData.data[index + 2] = b;
canvasData.data[index + 3] = a;
}
// That's how you update the canvas, so th...
What is the “realm” in basic authentication
...ed by HTTP/1.1)
The realm attribute (case-insensitive) is required for all
authentication schemes which issue a challenge. The realm value
(case-sensitive), in combination with the canonical root URL of the
server being accessed, defines the protection space. These realms
allow the prote...
How to create a density plot in matplotlib?
... this I get TypeError: slice indices must be integers or None or have an __index__ method
– endolith
Feb 16 '17 at 2:26
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How can you undo the last git add?
...adds since the last commit. git reset without a commit argument resets the index (unstages staged changes):
git reset
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A std::map that keep track of the order of insertion?
...rt via std::sort using appropriate functor.
Or you could use boost::multi_index. It allows to use several indexes.
In your case it could look like the following:
struct value_t {
string s;
int i;
};
struct string_tag {};
typedef multi_index_container<
value_t,
indexed_by&...
Cross-browser testing: All major browsers on ONE machine
...of IE/Safari on a single Windows machine.
Download: http://sandboxie.com/index.php?DownloadSandboxie
Patch: The extended version is required to enable multiple sandboxes at a time. Pay them or visit YouTube.
Running multiple IE/Safari versions simultaneously requires the extended version. If you d...