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汇编常用寄存器及指令基础总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...址指针寄存器，可用作SS的一个相对基址位置
SI（Source Index）：源变址寄存器可用来存放相对于DS段之源变址指针
DI（Destination Index）：目的变址寄存器，可用来存放相对于 ES 段之目的变址指针
FR（Flag Register）：单独的十六位...
When to use CouchDB over MongoDB and vice versa
...the link,
MongoDB: If you need dynamic queries. If you prefer to define indexes, not map/reduce functions. If you need good performance on a big DB. If you wanted CouchDB, but your data changes too much, filling up disks.
CouchDB : For accumulating, occasionally changing data, on which pre-define...
FIND_IN_SET() vs IN()
...CompanyIDs | '}')::INT[])
WHERE orderID = 1
and this would even use an index on companyID.
Unfortunately, this does not work in MySQL since the latter does not support arrays.
You may find this article interesting (see #2):
10 things in MySQL (that won’t work as expected)
Update:
If the...
Hide/Show Column in an HTML Table
... get cell location - https://stackoverflow.com/a/4999018/1366033
var cellIndex = $cell[0].cellIndex + 1;
$table.find(".show-column-footer").show()
$table.find("tbody tr, thead tr")
.children(":nth-child("+cellIndex+")")
.hide()
})
$(".show-column-footer").click(function(e) {
...
How does a hash table work?
...ut the total memory usage is no worse - just more pointers NULL instead of indexing into the data usefully.
– Tony Delroy
Aug 31 '17 at 4:11
3
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Calendar returns wrong month [duplicate]
...
Months are indexed from 0 not 1 so 10 is November and 11 will be December.
share
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improve this answer
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follo...
What is PostgreSQL explain telling me exactly?
...e dataset, that operation is done to that data set. (For instance scan an index to figure out what rows you want, filter a dataset, or sort it.) If two, the two datasets are the two things that are indented further, and they are joined by the rule you see. The meaning of most of the rules can be re...
Is there a performance difference between a for loop and a for-each loop?
...of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
applies equally to collections and
arrays:
// The preferred idiom for iterating over collections and arrays
for (Element e : elements) {
doSomething(e);
}
When y...
How to compare arrays in JavaScript?
...de a little test tool for both of the functions.
Bonus: Nested arrays with indexOf and contains
Samy Bencherif has prepared useful functions for the case you're searching for a specific object in nested arrays, which are available here: https://jsfiddle.net/SamyBencherif/8352y6yw/
...
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...