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how to exclude null values in array_agg like in string_agg using postgres?
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SQL Fiddle
select
id,
(select array_agg(a) from unnest(canonical_users) a where a is n...
Difference between volatile and synchronized in Java
...est for counter==1000 and finds it true and is then suspended. Then thread-2 does the same test and also sees it true and is suspended. Then thread-1 resumes and sets counter to 0. Then thread-2 resumes and again sets counter to 0 because it missed the update from thread-1. This can also happen eve...
Mocking Extension Methods with Moq
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Aug 23 '11 at 6:20
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How to escape os.system() calls?
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edited Nov 30 '15 at 19:25
offby1
5,4352222 silver badges4242 bronze badges
answered Aug 30 '08 at 10:...
How can I open several files at once in Vim?
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answered Jan 7 '10 at 20:09
skinpskinp
3,63933 gold badges2424 silver badges1919 bronze badges
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PHP cURL vs file_get_contents
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129
file_get_contents() is a simple screwdriver. Great for simple GET requests where the header, HT...
Traverse a list in reverse order in Python
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26 Answers
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Creating an empty file in C#
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edited Apr 29 '09 at 14:36
answered Apr 29 '09 at 14:23
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Get the latest record from mongodb collection
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142
This is a rehash of the previous answer but it's more likely to work on different mongodb versio...
Forward function declarations in a Bash or a Shell script?
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2 Answers
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