大约有 30,000 项符合查询结果（耗时：0.0456秒） [XML]
Which SQL query is faster? Filter on Join criteria or Where clause?
...
SELECT *
FROM TableA a
LEFT JOIN
TableXRef x
ON x.TableAID = a.ID
AND a.ID = 1
LEFT JOIN
TableB b
ON x.TableBID = b.ID
or this:
SELECT *
FROM TableA a
LEFT JOIN
TableXRef x
ON x.TableAID = a.ID
LEFT JOIN
TableB b
ON b.id = x.Ta...
Right Align button in horizontal LinearLayout
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Use below code for that
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="35dp"
android:orientation="horizontal" >
<TextView
...
boost::flat_map and its performance compared to map and unordered_map
...se, because your cache will not be warm, and your operation will likely be called just once. Therefore you need to benchmark using RDTSC, and time stuff calling them once only.
Intel has made a paper describing how to use RDTSC (using a cpuid instruction to flush the pipeline, and calling it at leas...
What exactly can cause an “HIERARCHY_REQUEST_ERR: DOM Exception 3”-Error?
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If you are getting this error due to a jquery ajax call $.ajax
Then you may need to specify what the dataType is coming back from the server. I have fixed the response a lot using this simple property.
$.ajax({
url: "URL_HERE",
dataType: "html",
success: functio...
How can I delete the current line in Emacs?
...ne
which will "kill to the end of the line and kill whole line on the next
call". But if you prefer delete instead of kill, you can use the
code below.
For point-to-string operation (kill/delete) I recommend to use zop-to-char
(defun aza-delete-line ()
"Delete from current position to end of lin...
How to generate unique ID with node.js
...upposed to use callbacks. What will happen with your code, is that base.getID query will get queued up by for execution, but the while loop will continusouly run as a busy loop pointlessly.
You should be able to solve your issue with a callback as follows:
function generate(count, k) {
var _sy...
What's the most efficient test of whether a PHP string ends with another string?
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3 function calls overhead doesn't make it fastest.
– Thanh Trung
Dec 10 '19 at 23:02
add a comment
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String output: format or concat in C#?
...o your bottom line as well as a scale issue if/when several other thousand calls are coming through ...
– Aidanapword
Dec 17 '10 at 11:37
23
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How to get CSS to select ID that begins with a string (not in Javascript)?
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[id^=product]
^= indicates "starts with". Conversely, $= indicates "ends with".
The symbols are actually borrowed from Regex syntax, where ^ and $ mean "start of string" and "end of string" respectively.
See the specs for ...
Using querySelector with IDs that are numbers
From what I understand the HTML5 spec lets you use IDs that are numbers like this.
5 Answers
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