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Postgresql aggregate array
... do something like this:
SELECT p.p_name,
STRING_AGG(Grade.Mark, ',' ORDER BY Grade.Mark) As marks
FROM Student
LEFT JOIN Grade ON Grade.Student_id = Student.Id
GROUP BY Student.Name;
EDIT
I am not sure. But maybe something like this then:
SELECT p.p_name,
array_to_string(ARRAY_AGG...
How can I open a cmd window in a specific location?
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This might be what you want:
cmd /K "cd C:\Windows\"
Note that in order to change drive letters, you need to use cd /d. For example:
C:\Windows\System32\cmd.exe /K "cd /d H:\Python\"
(documentation)
share
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How to convert a string to lower or upper case in Ruby
... Rails Active Support gem provides upcase, downcase, swapcase,capitalize, etc. methods with internationalization support:
gem install activesupport
irb -ractive_support/core_ext/string
"STRING ÁÂÃÀÇÉÊÍÓÔÕÚ".mb_chars.downcase.to_s
=> "string áâãàçéêíóôõú"
"string áâ...
Is MATLAB OOP slow or am I doing something wrong?
...at( a b ) , strcmp( a, b ) , retrieve first element of strfind( a, b ) , etc.
4 Answers
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Why can't I declare static methods in an interface?
... VM would have to look for a particular implementation of the interface in order to find the code behind the static method so that it could be executed. This then contradicts how static method resolution works and would introduce an inconsistency into the language.
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Create an instance of a class from a string
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@TaW - in order to use a class instance you will need to have some knowledge of what it is going to do - otherwise you won't be able to use it. The most common use case for this would be casting to some interface which give you a prede...
Regex to match only letters
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\p{L} matches all the umlauts sedilla accents etc, so you should go with that.
– Radu Simionescu
Oct 11 '16 at 8:45
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How do I dynamically assign properties to an object in TypeScript?
... What's the point of TypeScript if I have to cast so many things to any in order to use it? Just becomes extra noise in my code.. :/
– AjaxLeung
Jul 22 '16 at 19:04
17
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Private pages for a private Github repo
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Does your pages repo have to be public in order for GitHub pages to work?
– Dennis
Nov 19 '12 at 3:56
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How to have a transparent ImageButton: Android
...d ripple effect, use android:background="?android:selectableItemBackgroundBorderless"
– Mateus Gondim
Aug 2 '17 at 15:27
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