大约有 44,000 项符合查询结果（耗时：0.0568秒） [XML]
ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired
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Your table is already locked by some query. For example, you may have executed "select for update" and have not yet committed/rollbacked and fired another select query. Do a commit/rollback before executing your query.
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Numbering rows within groups in a data frame
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For making this r-faq question more complete, a base R alternative with sequence and rle:
df$num <- sequence(rle(df$cat)$lengths)
which gives the intended result:
> df
cat val num
4 aaa 0.05638315 1
2 ...
How set background drawable programmatically in Android
....os.Build.VERSION_CODES#LOLLIPOP}, the returned
* drawable will be styled for the specified Context's theme.
*
* @param id The desired resource identifier, as generated by the aapt tool.
* This integer encodes the package, type, and resource entry.
* The value 0 is an inva...
搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
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[initandlisten] db version v2.4.6
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[initandlisten] waiting for connections on port 27017
[websvr] admin web console waiting for connections on port 28017
mongodb默认自带提供了web访问接口，通过 IP + 端口的形式可以访问。
http://192.168.0.1:28017/
二、主...
Set color of TextView span in Android
...y,I know just where to find the answers");
wordtoSpan.setSpan(new ForegroundColorSpan(Color.BLUE), 15, 30, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
TV.setText(wordtoSpan);
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getSupportActionBar from inside of Fragment ActionBarCompat
...gment extends ActionBarActivity , but I don't see a similar support class for Fragments.
6 Answers
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What is the main purpose of setTag() getTag() methods of View?
...nerate a bunch of views that are similar. You could set an OnClickListener for each view individually:
button1.setOnClickListener(new OnClickListener ... );
button2.setOnClickListener(new OnClickListener ... );
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Then you have to create a unique onClick method for each view even if they do the...
How to delete or add column in SQLITE?
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stackoverflow.com/a/5987838/1578528 gives a basic example for performing the task.
– bikram990
May 8 '14 at 5:53
5
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Replace Default Null Values Returned From Left Outer Join
...e second and third tables and so I get a null which I think is the default for left outer join. Is there a way to replace the default values in the select statement? I have a workaround in that I can select into a table variable but it feels a little dirty.
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how to draw smooth curve through N points using javascript HTML5 canvas?
For a drawing application, I'm saving the mouse movement coordinates to an array then drawing them with lineTo. The resulting line is not smooth. How can I produce a single curve between all the gathered points?
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