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Grouped LIMIT in PostgreSQL: show the first N rows for each group?
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287
New solution (PostgreSQL 8.4)
SELECT
*
FROM (
SELECT
ROW_NUMBER() OVER (PARTITION B...
How do I convert a dictionary to a JSON String in C#?
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edited Aug 31 '16 at 21:13
Kenny Evitt
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Possible to access the index in a Hash each loop?
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2 Answers
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What would a “frozen dict” be?
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121
Python doesn't have a builtin frozendict type. It turns out this wouldn't be useful too often (...
Is there YAML syntax for sharing part of a list or map?
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answered Mar 1 '12 at 23:34
kittemonkittemon
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Java HashMap performance optimization / alternative
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25 Answers
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Shell equality operators (=, ==, -eq)
...eq foo ]; echo "$?" # wrong
-bash: [: foo: integer expression expected
2
(Side note: Quote those variable expansions! Do not leave out the double quotes above.)
If you're writing a #!/bin/bash script then I recommend using [[ instead. The doubled form has more features, more natural syntax, a...
An algorithm for inflating/deflating (offsetting, buffering) polygons
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12 Answers
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How to break nested loops in JavaScript? [duplicate]
...k < 4; k++){
for(var m = 0; m < 4; m++){
if(m == 2){
break dance;
}
}
}
}
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Delete specific line number(s) from a text file using sed?
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If you want to delete lines 5 through 10 and 12:
sed -e '5,10d;12d' file
This will print the results to the screen. If you want to save the results to the same file:
sed -i.bak -e '5,10d;12d' file
This will back the file up to file.bak, and delete the given lines.
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