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Multiple columns index when using the declarative ORM extension of sqlalchemy
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zzzeekzzzeek
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How to move a git repository into another directory and make that directory a git repository?
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edited Nov 3 '15 at 22:11
Robert Harvey
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Naming convention for Scala constants?
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edited Aug 20 '12 at 1:58
wjohnson
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Storing DateTime (UTC) vs. storing DateTimeOffset
...em so obvious.
– Andrew Backer
Sep 25 '12 at 15:49
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you said "datetimeoffset stores UTC time an...
Static function variables in Swift
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158
I don't think Swift supports static variable without having it attached to a class/struct. Try ...
How to count number of files in each directory?
... d -print0 | while read -d '' -r dir; do
files=("$dir"/*)
printf "%5d files in directory %s\n" "${#files[@]}" "$dir"
done
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printf format specifiers for uint32_t and size_t
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edited Jan 15 '13 at 18:45
answered Jul 2 '10 at 18:40
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what is the difference between a portlet and a servlet?
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dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
...drop=FALSE) %>% tally
#> Species n
#> 1 setosa 50
#> 2 versicolor 50
#> 3 virginica 50
#> 4 empty_level 0
# Add character column
iris$group2 = c(rep(c("A","B"), 50), rep(c("B","C"), each=25))
# Empty groups involving combinations of Species and gro...