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MySQL “Group By” and “Order By”
...umns used to work in practice but should not be relied upon. Per the MySQL documentation "this is useful primarily when all values in each nonaggregated column not named in the GROUP BY are the same for each group. The server is free to choose any value from each group, so unless they are the same, ...
Vim multiline editing like in sublimetext?
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Do yourself a favor by dropping the Windows compatibility layer.
The normal shortcut for entering Visual-Block mode is <C-v>.
Others have dealt with recording macros, here are a few other ideas:
Using only visual-blo...
What does the “yield” keyword do?
What is the use of the yield keyword in Python, and what does it do?
42 Answers
42
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How to get thread id from a thread pool?
...of those 5 threads executes my task (something like "thread #3 of 5 is doing this task")?
6 Answers
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Hashing a string with Sha256
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Encoding.Unicode is Microsoft's misleading name for UTF-16 (a double-wide encoding, used in the Windows world for historical reasons but not used by anyone else). http://msdn.microsoft.com/en-us/library/system.text.encoding.unicode.aspx
If you inspect your bytes array, you'll see that ...
Warning on “diff.renamelimit variable” when doing git push
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The documentation doesn't mention 0 as a special value for diff.renamelimit.
So you should set that limit to the value recommended.
Or you can try deactivating the rename detection altogether. (git config diff.renames 0)
You wi...
converting a .net Func to a .net Expression
...nts a generic delegate and not an expression. If there's any way you could do so (due to optimizations and other things done by the compiler, some data might be thrown away, so it might be impossible to get the original expression back), it'd be disassembling the IL on the fly and inferring the expr...
How do I access this object property with an illegal name?
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<?php
$x = new StdClass();
$x->{'todo-list'} = 'fred';
var_dump($x);
So, $object->{'todo-list'} is the sub-object. If you can set it like that, then you can also read it the same way:
echo $x->{'todo-list'};
Another possibility:
$todolist = 'todo-list...
Remove columns from dataframe where ALL values are NA
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This does not appear to work with non-numeric columns.
– verbamour
Feb 1 '17 at 23:17
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Can I query MongoDB ObjectId by date?
...);
/* Create an ObjectId with that hex timestamp */
var constructedObjectId = ObjectId(hexSeconds + "0000000000000000");
return constructedObjectId
}
/* Find all documents created after midnight on May 25th, 1980 */
db.mycollection.find({ _id: { $gt: objectIdWithTimestamp('1980/05/25...