大约有 18,500 项符合查询结果（耗时：0.0328秒） [XML]
must appear in the GROUP BY clause or be used in an aggregate function
...ted primary key, resulting in the following incorrect query: SELECT cname, id, MAX(avg) FROM makerar GROUP BY cname;, which did give this misleading error.
– Roberto
Mar 2 at 15:21
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Regex how to match an optional character
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Tim, I honestly am not sure as I didn't write this regex. I'm still pretty new to regex. If you see a better way of writing this, I'm open to suggestions.
– jim
Oct 24 '10 at 6:45
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Find the extension of a filename in Ruby
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Quite old topic but here is the way to get rid of extension separator dot and possible trailing spaces:
File.extname(path).strip.downcase[1..-1]
Examples:
File.extname(".test").strip.downcase[1..-1] # => nil
File.extname(".test.").strip.downcase[1..-1] ...
How to sort the result from string_agg()
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The question was about string_agg. Postgres was incidental to his question and he mentioned it last. The question is useful to others as well.
– nomen
Mar 5 at 17:42
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How to ignore xargs commands if stdin input is empty?
Consider this command:
6 Answers
6
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Specify pane percentage in tmuxinator project
...defined.
First set up your layout just how you like it - you can adjust widths with resize-pane until it is just right for you. Then run tmux list-windows. And then you should be able to use the layout: line from the output unaltered in tmuxinator.conf
So based on the output from your gist:
0: t...
How to create and write to a txt file using VBA
...ct is to make autocompletion
' (Intellisense) work, which helps you avoid typos and lets you discover other useful
' methods of the FileSystemObject
Dim fso As FileSystemObject
Set fso = New FileSystemObject
Dim fileStream As TextStream
' Here the actual file is created and ...
mysqli or PDO - what are the pros and cons? [closed]
...u do like object mapping, it's REALLY cool :
class Student {
public $id;
public $first_name;
public $last_name
public function getFullName() {
return $this->first_name.' '.$this->last_name
}
}
try
{
$dbh = new PDO("mysql:host=$hostname;dbname=school", $user...
Invert “if” statement to reduce nesting
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A return in the middle of the method is not necessarily bad. It might be better to return immediately if it makes the intent of the code clearer. For example:
double getPayAmount() {
double result;
if (_isDead) result = deadAmount();...
Outputting data from unit test in python
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What if I call a method foo inside testSomething and it logs something. How can I see the output for that without passing the logger to foo?
– simao
Nov 2 '10 at 0:57
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