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Finding duplicate values in a SQL table
...ly group on both of the columns.
Note: the older ANSI standard is to have all non-aggregated columns in the GROUP BY but this has changed with the idea of "functional dependency":
In relational database theory, a functional dependency is a constraint between two sets of attributes in a relation...
What is the dual table in Oracle?
...of dummy table with a single record used for selecting when you're not actually interested in the data, but instead want the results of some system function in a select statement:
e.g. select sysdate from dual;
See http://www.adp-gmbh.ch/ora/misc/dual.html
...
NoSQL (MongoDB) vs Lucene (or Solr) as your database
...arned:
You can easily use Lucene/Solr in lieu of MongoDB for pretty much all situations, but not vice versa. Grant Ingersoll's post sums it up here.
MongoDB etc. seem to serve a purpose where there is no requirement of searching and/or faceting. It appears to be a simpler and arguably easier trans...
SQL update query using joins
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I usually start with semicolon to terminate previous statement (if any). CTE rocks ! Simple to design complicated query / joined updates. I use it all the time...
– Adam W
Dec 17 '15 at 5:19
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Should I write script in the body or the head of the html? [duplicate]
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I would answer this with multiple options actually, the some of which actually render in the body.
Place library script such as the jQuery library in the head section.
Place normal script in the head unless it becomes a performance/page load issue.
Place script associa...
How can I get the count of milliseconds since midnight for the current?
... // Get current moment in UTC, then…
.get( ChronoField.MILLI_OF_SECOND ) // interrogate a `TemporalField`.
2017-04-25T03:01:14.113Z → 113
Get the fractional second in nanoseconds (billions).
Divide by a thousand to truncate to milliseconds (thousands).
See this code run l...
How to listen for a WebView finishing loading a URL?
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Extend WebViewClient and call onPageFinished() as follows:
mWebView.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
// do your stuff here
}
});
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File to byte[] in Java
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@matteo: any? See other answers, e.g. Files.readAllBytes(). Simple, no dependency.
– ymajoros
Apr 24 '14 at 21:13
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When a 'blur' event occurs, how can I find out which element focus went *to*?
...s caused by tabbing through fields with the keyboard, and does not work at all in Chrome or Safari. The big problem with using activeElement (except in IE) is that it is not consistently updated until after the blur event has been processed, and may have no valid value at all during processing! This...
Twitter Bootstrap vs jQuery UI? [closed]
...n several projects.
The biggest difference in my opinion
jQuery UI is fallback safe, it works correctly and looks good in old browsers, where Bootstrap is based on CSS3 which basically means GREAT in new browsers, not so great in old
Update frequency: Bootstrap is getting some great big updates ...