大约有 40,000 项符合查询结果（耗时：0.0343秒） [XML]
Rank function in MySQL
...:= @curRank + 1 AS rank
FROM person p, (SELECT @curRank := 0) r
ORDER BY age;
The (SELECT @curRank := 0) part allows the variable initialization without requiring a separate SET command.
Test case:
CREATE TABLE person (id int, first_name varchar(20), age int, gender char(1));
INSERT INTO ...
offsetting an html anchor to adjust for fixed header [duplicate]
...fixed header (I hope that makes sense). I need a way to offset the anchor by the 25px from the height of the header. I would prefer HTML or CSS, but Javascript would be acceptable as well.
...
How to load external webpage inside WebView
...ebView;
setContentView(R.layout.webviewlayout);
webView = (WebView)findViewById(R.id.help_webview);
webView.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("http://www.google.com");
Update
Add webView.setWebViewClient(new WebViewController()); to your Activity.
WebViewController class:...
SqlException from Entity Framework - New transaction is not allowed because there are other threads
...ou can write your query like this:
foreach (var client in clientList.OrderBy(c => c.Id).QueryInChunksOf(100))
{
// do stuff
context.SaveChanges();
}
The queryable object you call this method on must be ordered. This is because Entity Framework only supports IQueryable<T>.Skip(in...
Delete all data in SQL Server database
...ECT TOP 1 [name] FROM sysobjects WHERE [type] = 'P' AND category = 0 ORDER BY [name])
WHILE @name is not null
BEGIN
SELECT @SQL = 'DROP PROCEDURE [dbo].[' + RTRIM(@name) +']'
EXEC (@SQL)
PRINT 'Dropped Procedure: ' + @name
SELECT @name = (SELECT TOP 1 [name] FROM sysobjects WHERE [t...
jQuery select2 get value of select tag?
...
for an select called by id name instead of class name, use: $(".first").val()
– Rui Martins
Jun 21 '17 at 9:15
...
MongoDB and “joins” [duplicate]
...
What do you mean by "client side" and "server side"?
– scaryguy
Aug 14 '15 at 3:21
4
...
Fastest way to count exact number of rows in a very large table?
...
@zerkmsby: For COUNT(key) I meant COUNT(primarykey) which should be non nullable. I'll clarify
– gbn
May 20 '11 at 8:30
...
jquery .html() vs .append()
...;ul> and saw an increase in render (not load) time from ~12s -> .25s by switching the .append(giantListHTMLAsASingleString) to .html(giantListHTMLAsASingleString). If you are alreadying doing the 'join' trick or building up a big html string on your list there is definitely a perf diff in the...
What's faster, SELECT DISTINCT or GROUP BY in MySQL?
...e the same, a query optimizer would have to catch the fact that your GROUP BY is not taking advantage of any group members, just their keys. DISTINCT makes this explicit, so you can get away with a slightly dumber optimizer.
When in doubt, test!
...