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how to exclude null values in array_agg like in string_agg using postgres?
If I use array_agg to collect names, I get my names separated by commas, but in case there is a null value, that null is also taken as a name in the aggregate. For example :
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How to generate keyboard events in Python?
...EDKEY = 0x0001
KEYEVENTF_KEYUP = 0x0002
KEYEVENTF_UNICODE = 0x0004
KEYEVENTF_SCANCODE = 0x0008
MAPVK_VK_TO_VSC = 0
# msdn.microsoft.com/en-us/library/dd375731
VK_TAB = 0x09
VK_MENU = 0x12
# C struct definitions
wintypes.ULONG_PTR = wintypes.WPARAM
class MOUSEINPUT(ctypes.Structure...
Listing only directories using ls in Bash?
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1034
*/ is a pattern that matches all of the subdirectories in the current directory (* would match a...
javascript: Clear all timeouts?
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answered Jan 14 '12 at 4:43
user123444555621user123444555621
123k2323 gold badges101101 silver badges120120 bronze badges
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how to display full stored procedure code?
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answered Aug 19 '10 at 18:54
Frank HeikensFrank Heikens
88.7k2222 gold badges121121 silver badges125125 bronze badges
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How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?
...system should contain plenty information for your quest. My system (2.6.32-40-generic #87-Ubuntu) suggests:
/sys/class/tty
Which gives you descriptions of all TTY devices known to the system. A trimmed down example:
# ll /sys/class/tty/ttyUSB*
lrwxrwxrwx 1 root root 0 2012-03-28 20:43 /sys/class...
How to smooth a curve in the right way?
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edited Jul 12 '18 at 0:41
dopexxx
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answered Dec 17 '13 at 19...
C read file line by line
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edited Nov 26 '18 at 15:42
gsamaras
64.5k3131 gold badges140140 silver badges240240 bronze badges
answ...
Tools for making latex tables in R [closed]
...roduce tables for different regression objects. One such example is the lme4 memisc code shown in the question. It might make sense to start a github repository to collect such code snippets, and over time maybe even add it to the memisc package. Any takers?
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Configure apache to listen on port other than 80
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edited Jun 29 '16 at 17:40
user719662
answered Sep 26 '14 at 16:53
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