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MySQL indexes - what are the best practices?
...that I will be searching or selecting using a WHERE clause but sometimes it doesn't seem so black and white.
7 Answers
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How to prevent ifelse() from turning Date objects into numeric objects
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edited Jun 20 at 9:12
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answered Jun 29 '16 at 7:31
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Where are Docker images stored on the host machine?
...our kernel support. In most places this will be aufs but the RedHats went with devicemapper.
You can manually set the storage driver with the -s or --storage-driver= option to the Docker daemon.
/var/lib/docker/{driver-name} will contain the driver specific storage for contents of the images.
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Is it possible to specify condition in Count()?
Is it possible to specify a condition in Count() ? I would like to count only the rows that have, for example, "Manager" in the Position column.
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Get second child using jQuery
...).next()
And a more elaborated example:
This code gets the text of the 'title' attribute of the 2nd child element of the UL identified as 'my_list':
$('ul#my_list:first-child').next().attr("title")
In this second example, you can get rid of the 'ul' at the start of the selector, as it's redu...
Should I pass an std::function by const-reference?
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If you want performance, pass by value if you are storing it.
Suppose you have a function called "run this in the UI thread".
std::future<void> run_in_ui_thread( std::function<void()> )
which runs some code in the "ui" thread, then signals the future when done. (Use...
IIS7 Overrides customErrors when setting Response.StatusCode?
...whatever is appropriate. For example, if I make a custom 404 page and name it 404.aspx, I could put <% Response.StatusCode = 404 %> in the contents in order to make it have a true 404 status header.
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How to convert JSON to XML or XML to JSON?
...format to object or viceversa. I am not sure in the Json.NET framework, is it possible to convert a string in JSON to XML format and viceversa?
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How do you view ALL text from an ntext or nvarchar(max) in SSMS?
...om an NTEXT or NVARCHAR(max) in SQL Server Management Studio? By default, it only seems to return the first few hundred characters (255?) but sometimes I just want a quick way of viewing the whole field, without having to write a program to do it. Even SSMS 2012 still has this problem :(
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Can I change multiplier property for NSLayoutConstraint?
...:
NSLayoutConstraint *standardConstraint, *zoomedConstraint;
// ...
// switch between constraints
standardConstraint.active = NO; // this line should always be the first line. because you have to deactivate one before activating the other one. or they will conflict.
zoomedConstraint.active = YES;
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