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mongodb group values by multiple fields
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207
TLDR Summary
In modern MongoDB releases you can brute force this with $slice just off the basi...
Convert UTC to local time in Rails 3
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edited Dec 1 '14 at 20:49
answered Mar 14 '11 at 15:23
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What is the proper way to check if a string is empty in Perl?
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answered Jan 11 '10 at 23:20
Greg HewgillGreg Hewgill
783k167167 gold badges10841084 silver badges12221222 bronze badges
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cmake and libpthread
...You can add the compiler option as well, like this:
If you have CMake 3.1.0+, this becomes even easier:
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
target_link_libraries(my_app PRIVATE Threads::Threads)
If you are using CMake 2.8.12+, you can simplify this to:
find_packag...
Highlight label if checkbox is checked
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edited Jul 20 '15 at 22:26
Eliasz Kubala
3,11411 gold badge1717 silver badges2727 bronze badges
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What's the difference between `1L` and `1`?
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130
So, @James and @Brian explained what 3L means. But why would you use it?
Most of the time it ma...
What is the status of JSR 305?
I have seen the question JSR305 vs. JSR308 (Java Type Anotations) - Which is going to be the standard? and I understand the difference between JSR 308 and JSR 305 .
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How do I remove a property from a JavaScript object?
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answered Oct 16 '08 at 10:58
nickfnickf
482k187187 gold badges607607 silver badges703703 bronze badges
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Assign multiple columns using := in data.table, by group
... a b col1 col2 mean sum Name1 Longer%
# 1: 1 1 hi hello 2.5 5 10 15
# 2: 2 2 hi hello 3.5 7 14 21
# 3: 3 3 hi hello 4.5 9 18 27
# 4: 1 4 hi hello 2.5 5 10 15
# 5: 2 5 hi hello 3.5 7 14 21
# 6: 3 6 hi hello 4.5 9 18 27
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What does get-task-allow do in Xcode?
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edited Jun 22 '09 at 13:00
answered Jun 22 '09 at 10:34
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