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SQL join: selecting the last records in a one-to-many relationship
...)
LEFT OUTER JOIN purchase p2 ON (c.id = p2.customer_id AND
(p1.date < p2.date OR (p1.date = p2.date AND p1.id < p2.id)))
WHERE p2.id IS NULL;
Explanation: given a row p1, there should be no row p2 with the same customer and a later date (or in the case of ties, a later id). When we fi...
Can I store the .git folder outside the files I want tracked?
...e form of a file named .git) in the root of the work tree. I think the result is identical to niks' answer.
git init --separate-git-dir path/to/repo.git path/to/worktree
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How to get the CPU Usage in C#?
...read.Sleep call in-between (1000ms should suffice). See blogs.msdn.com/b/bclteam/archive/2006/06/02/618156.aspx for more information on why this is required, but the high level summary is that you need to two samples in order to calculate the value, and you need to give the OS a time to get both of ...
How do I create a URL shortener?
... to face is spammers using your service to mask their URLS to avoid spam filters. You need to either limit the service to known good actors, or apply spam filtering to the long urls. Otherwise you WILL be abused by spammers.
– Edward Falk
May 26 '13 at 15:34
...
Stored procedure slow when called from web, fast from Management Studio
...query/stored proc).
See ADO.NET calling T-SQL Stored Procedure causes a SqlTimeoutException for another example, with a more complete explanation and resolution.
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Calling Java varargs method with single null argument?
...ic import from the java.util.Arrays class. I just assumed it was obvious. Although now that I'm thinking about it, I probably should have just used Arrays.toString() since the only reason it gets converted to a List is so it will print pretty.
– Mike Deck
Jun 2...
How do you make Git ignore files without using .gitignore?
...
*
I.e.
$ cat > tracked_dir1/tracked_dir2/untracked_dir/.gitignore
*
<Ctrl+D>
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WCF Error - Could not find default endpoint element that references contract 'UserService.UserServic
...cHttpBinding_YourName";
basicHttpbinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
basicHttpbinding.Security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName;
EndpointAddress endpointAddress = new EndpointAddress("http://<Your machine>/Serv...
What does the “Just” syntax mean in Haskell?
...ting
The type has two constructors, Just a and Nothing. When a type has multiple constructors, it means that a value of the type must have been constructed with just one of the possible constructors. For this type, a value was either constructed via Just or Nothing, there are no other (non-error) p...
How to break out of a loop from inside a switch?
...nating the program from within the program.
Is inefficient.
There are multiple loop termination conditions, including checking for "true".
Is prone to bugs.
Cannot easily determine where to put code that will always execute for each iteration.
Leads to unnecessarily complex code.
Automatic so...