大约有 13,914 项符合查询结果（耗时：0.0209秒） [XML]
PostgreSQL array_agg order
...g the input values from a sorted subquery will usually work, however. For example:
SELECT xmlagg(x) FROM (SELECT x FROM test ORDER BY y DESC) AS tab;
So in your case you would write:
SELECT
array_to_string(array_agg(animal_name),';') animal_names,
array_to_string(array_agg(animal_type),';') ...
Why does (1 in [1,0] == True) evaluate to False?
...
Python actually applies comparison operator chaining here. The expression is translated to
(1 in [1, 0]) and ([1, 0] == True)
which is obviously False.
This also happens for expressions like
a < b < c
which translate to
(a < b) and (b < c)
(without evaluating b twice...
SVN+SSH, not having to do ssh-add every time? (Mac OS)
I know the answer is out there, but I'm pretty Unix-dumb and probably wouldn't recognize the solution if it hit me in the face.
...
D3.js: what is 'g' in .append(“g”) D3.js code?
...t always enlightens: developer.mozilla.org/en/docs/Web/SVG/Element/g. An experimental pen can be found here: codepen.io/ahujamoh/pen/brRpWM
– Mohit
Aug 10 '17 at 12:14
add a ...
Find a pair of elements from an array whose sum equals a given number
Given array of n integers and given a number X, find all the unique pairs of elements (a,b), whose summation is equal to X.
...
How to build for armv6 and armv7 architectures with iOS 5
... deployment target of iOS 4.0. With only armv7 specified in Architectures, Xcode warned me that to support anything below iOS4.2 I had to include armv6 in Architectures. Just edit that field, click the "+" button when the dialog pops up and enter the literal "armv6".
In my case, we want our app to ...
How to trick an application into thinking its stdout is a terminal, not a pipe
...a!
The script command does what we want...
script --return --quiet -c "[executable string]" /dev/null
Does the trick!
Usage:
script [options] [file]
Make a typescript of a terminal session.
Options:
-a, --append append the output
-c, --command <command> run com...
How to set commands output as a variable in a batch file
...t possible to set a statement's output of a batch file to a variable, for example:
7 Answers
...
Is there an easy way to check the .NET Framework version?
...89)) {
return "4.5 or later";
}
// This line should never execute. A non-null release key should mean
// that 4.5 or later is installed.
return "No 4.5 or later version detected";
}
share
...
Java Generics: Cannot cast List to List? [duplicate]
...g IMO, which makes assignments within the array unsafe - they can fail at execution time, despite being fine at compile time.
In the first case, imagine that the code did compile, and was followed by:
b1.add(new SomeOtherTree());
DataNode node = a1.get(0);
What would you expect to happen?
You c...