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How to find the size of an array in postgresql
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112
As vyegorov mentioned, array_length will do the trick. Or if you know that the array is 1-dim...
Plotting time in Python with Matplotlib
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184
You must first convert your timestamps to Python datetime objects (use datetime.strptime). The...
Postgresql SELECT if string contains
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137
You should use 'tag_name' outside of quotes; then its interpreted as a field of the record. Co...
How to set enum to null
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edited Mar 11 '15 at 14:45
MikeTheLiar
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Generating a list of which files changed between hg versions
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hg status --rev x:y
where x and y are desired revision numbers (or tag or branch names).
If...
How do you increase the max number of concurrent connections in Apache?
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172
Here's a detailed explanation about the calculation of MaxClients and MaxRequestsPerChild
htt...
how to “reimport” module to python then code be changed after import
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For Python 2.x
reload(foo)
For Python 3.x
import importlib
import foo #import the module ...
Is there type Long in SQLite?
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221
From the SQLite docs
INTEGER. The value is a signed integer, stored in 1, 2, 3, 4, 6, or 8 b...
Why use symbols as hash keys in Ruby?
...hed keys" against each other.
Long answer:
https://web.archive.org/web/20180709094450/http://www.reactive.io/tips/2009/01/11/the-difference-between-ruby-symbols-and-strings
http://www.randomhacks.net.s3-website-us-east-1.amazonaws.com/2007/01/20/13-ways-of-looking-at-a-ruby-symbol/
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