大约有 49,000 项符合查询结果（耗时：0.0608秒） [XML]
SQL Query to concatenate column values from multiple rows in Oracle
..., which works on versions prior to 11.2. Because WM_CONCAT is undocumented and unsupported by Oracle, it's recommended not to use it in production system.
With XMLAGG you can do the following:
SELECT XMLAGG(XMLELEMENT(E,ename||',')).EXTRACT('//text()') "Result"
FROM employee_names
What this doe...
Left align two graph edges (ggplot)
I'm using ggplot and have two graphs that I want to display on top of each other. I used grid.arrange from gridExtra to stack them. The problem is I want the left edges of the graphs to align as well as the right edges regardless of axis labels. (the problem arises because the labels of one gra...
No 'Access-Control-Allow-Origin' - Node / Apache Port Issue
i've created a small API using Node/Express and trying to pull data using Angularjs but as my html page is running under apache on localhost:8888 and node API is listen on port 3000, i am getting the No 'Access-Control-Allow-Origin'. I tried using node-http-proxy and Vhosts Apache but not having ...
Download JSON object as a file from browser
...em.click();
In this case, storageObj is the js object you want to store, and "scene.json" is just an example name for the resulting file.
This approach has the following advantages over other proposed ones:
No HTML element needs to be clicked
Result will be named as you want it
no jQuery needed...
Does IE9 support console.log, and is it a real function?
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In Internet Explorer 9 (and 8), the console object is only exposed when the developer tools are opened for a particular tab. If you hide the developer tools window for that tab, the console object remains exposed for each page you navigate to. If ...
rails + MySQL on OSX: Library not loaded: libmysqlclient.18.dylib
I'm just starting out with Ruby (and rails). I did the setup according to http://ruby.railstutorial.org/ruby-on-rails-tutorial-book#sec:ruby gems, using rvm . I have everything working well with sqlite.
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How to decorate a class?
...class? Specifically, I want to use a decorator to add a member to a class and change the constructor to take a value for that member.
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A free tool to check C/C++ source code against a set of coding standards? [closed]
...int-like static code analyzer, I only would like to check against coding standards like variable naming, capitalization, spacing, identation, bracket placement, and so on.
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How to avoid “ConcurrentModificationException” while removing elements from `ArrayList` while iterat
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Use an Iterator and call remove():
Iterator<String> iter = myArrayList.iterator();
while (iter.hasNext()) {
String str = iter.next();
if (someCondition)
iter.remove();
}
...
Determining if an Object is of primitive type
I have an Object[] array, and I am trying to find the ones that are primitives. I've tried to use Class.isPrimitive() , but it seems I'm doing something wrong:
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