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How do I delete a fixed number of rows with sorting in PostgreSQL?
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Incremental VACUUMs won't change ctids, I don't think. Since that just compacts within each page, and the ctid is just the line number not a page offset. A VACUUM FULL or a CLUSTER operation would change the ctid, but those operations take an access exclusive lock on...
mongodb: insert if not exists
Every day, I receive a stock of documents (an update). What I want to do is insert each item that does not already exist.
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Mean per group in a data.frame [duplicate]
...s for some reason. Checking my data.table for is.nan() and is.na() however does not display any results. Any thoughts?
– jdepypere
May 11 '15 at 23:12
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Using XPATH to search text containing
...behavior, so you can
ignore all the tabs and newlines in
your HTML and do assertions based on
how the text looks in the browser when
rendered. We do this by replacing all
non-visible whitespace (including the
non-breaking space " ") with a
single space. All visible newlines
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Throttling method calls to M requests in N seconds
... execution of some method to maximum M calls in N seconds (or ms or nanos, does not matter).
14 Answers
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HTTP GET Request in Node.js Express
...rom a sample of mine. It's asynchronous and returns a JSON object. It can do any form of GET request.
Note that there are more optimal ways (just a sample) - for example, instead of concatenating the chunks you put into an array and join it etc... Hopefully, it gets you started in the right direct...
How to remove from a map while iterating it?
How do I remove from a map while iterating it? like:
6 Answers
6
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How can I pop-up a print dialog box using Javascript?
...automatically when the user arrives at the print-friendly page. How can I do this with javascript?
8 Answers
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Can Android do peer-to-peer ad-hoc networking?
... report on the feature you're requesting.
It's status is "reviewed" but I don't believe it's been implemented yet.
http://code.google.com/p/android/issues/detail?id=82
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Javascript: Setting location.href versus location
...lightly shorter. If you're trying to be terse, you can usually omit the window. too.
URL assignments to both location.href and location are defined to work in JavaScript 1.0, back in Netscape 2, and have been implemented in every browser since. So take your pick and use whichever you find clearest....