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Why does direction of index matter in MongoDB?
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114
MongoDB concatenates the compound key in some way and uses it as the key in a BTree.
When fin...
How can I use “:” as an AWK field separator?
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"-F" is a command line argument, not AWK syntax. Try:
echo "1: " | awk -F ":" '/1/ {print $1}'
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SQL Logic Operator Precedence: And and Or
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And has precedence over Or, so, even if a <=> a1 Or a2
Where a And b
is not the same as
Where a1 Or a2 And b,
because that would be Executed as
Where a1 Or (a2 And b)
and what you want, to make them the same, is the following (using parentheses to override rule...
Error to install Nokogiri on OSX 10.9 Maverick?
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You can also install Nokogiri on Mac OS X 10.9 Mavericks with full XCode Install using:
gem install nokogiri -- --with-xml2-include=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/libxml2
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Floating point vs integer calculations on modern hardware
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Find the most frequent number in a numpy vector
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Regular expression to match numbers with or without commas and decimals in text
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Best way to test if a row exists in a MySQL table
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Most popular screen sizes/resolutions on Android phones [closed]
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61
You can see the resolutions for those categories in the Table 2, in this section: http://develop...
What do “branch”, “tag” and “trunk” mean in Subversion repositories?
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