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When should I use a composite index?
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You should use a composite index when you are using queries that benefit from it. A composite index that looks like this:
index( column_A, column_B, column_C )
will benefit a query that uses those fields for joining, filtering, and sometimes sel...
CFBundleVersion in the Info.plist Upload Error
... number; i.e. the "whole string" is NOT treated as a number, instead the bits between dots are treated as SEPARATE numbers. e.g. "1.02" is treated by Apple as "1.2". So, for Apple, 1.02 is GREATER THAN 1.1
Apple sometimes gets "confused" and seems to compare your uploaded-app to the version of a DI...
Reading a string with scanf
I'm a little bit confused about something. I was under the impression that the correct way of reading a C string with scanf() went along the lines of
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How to add http:// if it doesn't exist in the URL?
How can I add http:// to a URL if it doesn't already include a protocol (e.g. http:// , https:// or ftp:// )?
8 Answe...
Get all unique values in a JavaScript array (remove duplicates)
...o make sure are unique. I found the code snippet below on the internet and it works great until the array has a zero in it. I found this other script here on Stack Overflow that looks almost exactly like it, but it doesn't fail.
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Realistic usage of the C99 'restrict' keyword?
I was browsing through some documentation and questions/answers and saw it mentioned. I read a brief description, stating that it would be basically a promise from the programmer that the pointer won't be used to point somewhere else.
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Empty arrays seem to equal true and false at the same time
...n you call if (arr == false) you compare values of this object and the primitive false value. Internally, arr.toString() is called, which returns an empty string "".
This is because toString called on Array returns Array.join(), and empty string is one of falsy values in JavaScript.
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How to create an exit message
Is there a one line function call that quits the program and displays a message? I know in Perl it's as simple as:
4 Answer...
How to extract custom header value in Web API message handler?
...follow
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edited Feb 19 '13 at 23:05
answered Feb 19 '13 at 21:14
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Entity Framework: One Database, Multiple DbContexts. Is this a bad idea? [closed]
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You can have multiple contexts for single database. It can be useful for example if your database contains multiple database schemas and you want to handle each of them as separate self contained area.
The problem is when you want to use code first to create your database - ...