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quick random row selection in Postgres
...ith OFFSET, as in
SELECT myid FROM mytable OFFSET floor(random()*N) LIMIT 1;
The N is the number of rows in mytable. You may need to first do a SELECT COUNT(*) to figure out the value of N.
Update (by Antony Hatchkins)
You must use floor here:
SELECT myid FROM mytable OFFSET floor(random()*N) L...
CPU Privilege Rings: Why rings 1 and 2 aren't used?
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114
As a hobbyist operating system writer, I found that because paging (a major part of the modern...
How to remove the left part of a string?
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answered Apr 25 at 21:01
Xavier GuihotXavier Guihot
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How to get line count of a large file cheaply in Python?
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Convert base-2 binary number string to int
...e base of the input number, i.e. 2 for a binary number:
>>> int('11111111', 2)
255
Here is documentation for python2, and for python3.
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Delete local Git branches after deleting them on the remote repo
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Why does this assert throw a format exception when comparing structures?
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I've got it. And yes, it's a bug.
The problem is that there are two levels of string.Format g...
SHA-1 fingerprint of keystore certificate
Is the method for getting a SHA-1 fingerprint the same as the method of getting the a fingerprint? Previously, I was running this command:
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How does one reorder columns in a data frame?
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