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How can I define a composite primary key in SQL?
...rID)
);
The pair (QuestionID,MemberID) must then be unique for the table and neither value can be NULL. If you do a query like this:
SELECT * FROM voting WHERE QuestionID = 7
it will use the primary key's index. If however you do this:
SELECT * FROM voting WHERE MemberID = 7
it won't because...
Does MySQL foreign_key_checks affect the entire database?
When I execute this command in MySQL:
6 Answers
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How can I set NODE_ENV=production on Windows?
...tained), use
set NODE_ENV=production
This should be executed in the command prompt where you intend to run your Node.js application.
The above line would set the environment variable NODE_ENV for the command prompt where you execute the command.
To set environment variables globally so they per...
continue processing php after sending http response
My script is called by server. From server I'll receive ID_OF_MESSAGE and TEXT_OF_MESSAGE .
12 Answers
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How to stop Visual Studio from opening a file on single click?
...d a double click). Is there a way to make double-click the 'view file' command?
6 Answers
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how to get GET and POST variables with JQuery?
How do I simply get GET and POST values with JQuery?
14 Answers
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How to display line numbers in 'less' (GNU)
What is the command to make less display line numbers in the left column?
6 Answers
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Redirecting EC2 Elastic Load Balancer from HTTP to HTTPS
...is in the console, do the the following:
Go to your Load Balancer in EC2 and tab "Listeners"
Select "View/edit rules" on your HTTP listener
Delete all rules except for the default one (bottom)
Edit default rule: choose "Redirect to" as an action, leave everything as default and enter "443" as a po...
How to delete an element from an array in C#
...
You can also convert your array to a list and call remove on the list. You can then convert back to your array.
int[] numbers = {1, 3, 4, 9, 2};
var numbersList = numbers.ToList();
numbersList.Remove(4);
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How to get URI from an asset File?
...in much the same way you would use a URL. The syntax for assets is file:///android_asset/... (note: three slashes) where the ellipsis is the path of the file from within the assets/ folder.
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