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How do I delete a fixed number of rows with sorting in PostgreSQL?
...d IN (
SELECT ctid
FROM logtable
ORDER BY timestamp
LIMIT 10
)
The ctid is:
The physical location of the row version within its table. Note that although the ctid can be used to locate the row version very quickly, a row's ctid will change if it is updated or moved by VACUUM FU...
Difference in months between two dates
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40 Answers
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How can you hide database output in Rails console?
...logging in console)
To turn it back on
ActiveRecord::Base.logger.level = 0
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How to flatten nested objects with linq expression
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200
myBooks.SelectMany(b => b.Chapters
.SelectMany(c => c.Pages
.Select(p => b...
Select rows which are not present in other table
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+500
There are basically 4 techniques for this task, all of them standard SQL.
NOT EXISTS
Often fastest in Postgres.
SELECT ip
FROM ...
jQuery equivalent of JavaScript's addEventListener method
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edited Jul 30 '14 at 18:30
answered Mar 7 '10 at 22:25
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Is there a way to automatically build the package.json file for Node.js projects
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Difference between wait and sleep
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answered Nov 8 '12 at 20:08
MRABMRAB
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Using helpers in model: how do I include helper dependencies?
...om a text area. Following the advice from http://blog.caboo.se/articles/2008/8/25/sanitize-your-users-html-input , I'm cleaning up the input in the model before saving to database, using the before_validate callback.
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Auto-fit TextView for Android
...itTextView.setMaxLines(maxLines);
fontFitTextView.setTextSize(500);// max size
fontFitTextView.enableSizeCache(false);
fontFitTextView.setBackgroundColor(0xff00ff00);
final String text = getRandomText();
fontFitTextView.setText(text);
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