大约有 42,000 项符合查询结果（耗时：0.0477秒） [XML]
Reason for Column is invalid in the select list because it is not contained in either an aggregate f
...table T:
a b
--------
1 abc
1 def
1 ghi
2 jkl
2 mno
2 pqr
And I do the following query:
SELECT a, b
FROM T
GROUP BY a
The output should have two rows, one row where a=1 and a second row where a=2.
But what should the value of b show on each of these two rows? There are three pos...
JavaScript click event listener on class
... Older browsers (like IE6, IE7, IE8) don´t support getElementsByClassName and so they return undefined.
EDIT : Correction
getElementsByClassName doesnt return an array, but a HTMLCollection in most, or a NodeList in some browsers (Mozilla ref). Both of these types are Array-Like, (meaning that ...
How to search for occurrences of more than one space between words in a line
...
[ ]{2,}
SPACE (2 or more)
You could also check that before and after those spaces words follow. (not other whitespace like tabs or new lines)
\w[ ]{2,}\w
the same, but you can also pick (capture) only the spaces for tasks like replacement
\w([ ]{2,})\w
or see that before and af...
SQL Server Management Studio won't let me add an index to a table
...older in the table the "New Index" menu item is grayed out. I don't understand why. I've deleted all data in the table just in case, and refreshed and restarted SSMS, but no luck. I'm using SQL Server 2012 Business Intelligence SP1 CTP.
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Cleanest way to build an SQL string in Java
...thing) - instead of the awful string concat method using millions of "+"'s and quotes which is unreadable at best - there must be a better way.
...
How can I set the default value for an HTML element?
...
And keep continue using id attribute for <Select> and it is not good to use value attribute for <select> html element.
– Sree Rama
Mar 19 '13 at 7:48
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Read environment variables in Node.js
... Note that this will not be visible outside the node process and its subprocesses. E.g. it wouldn't be visible if you fire env in another shell window while the node process is running, nor in the same shell after the node process exits.
– Marko Bonaci
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How to send commands when opening a tmux session inside another tmux session?
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The send-prefix command can be used to send your prefix keystroke to (the process running in) the active pane. By default, the prefix is C-b and C-b is bound to send-prefix (so that hitting it twice sends a single C-b to the active pane). This i...
How can I use “” in javadoc without formatting?
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You can use &lt; for < and &gt; for > .
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Android multiple email attachments using Intent
I've been working on Android program to send email with an attachment (image file, audio file, etc) using Intent with ACTION_SEND . The program is working when email has a single attachment. I used Intent.putExtra(android.content.Intent.EXTRA_STREAM, uri) to attach the designated image file to th...