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Warning: Null value is eliminated by an aggregate or other SET operation in Aqua Data Studio
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You would mostly be using COUNT to summarize over a UID. Therefore
COUNT([uid]) will produce the warning:
Warning: Null value is eliminated by an aggregate or other SET operation.
whilst being used with a left join, where the counted object does not exist.
Using COUNT(*) in this...
How To Set Text In An EditText
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If you check the docs for EditText, you'll find a setText() method. It takes in a String and a TextView.BufferType. For example:
EditText editText = (EditText)findViewById(R.id.edit_text);
editText.setText("Google is your friend.", TextView.Buffe...
git: fatal: Could not read from remote repository
...ystem as part of your remote's URL. Put the username, followed by an @, before the remote hostname.
git remote set-url website abc@***.com:path/to/repo
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If threads share the same PID, how can they be identified?
..._| pid=42 |_
_/ | tgid=42 | \_ (new thread) _
_ (fork) _/ +---------+ \
/ +---------+
+---------+ | process |
| process | | pid=44 |
| pid=...
What's the best way to set a single pixel in an HTML5 canvas?
The HTML5 Canvas has no method for explicitly setting a single pixel.
14 Answers
14
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Reference: mod_rewrite, URL rewriting and “pretty links” explained
...like this:
GET /foo/bar?baz=42 HTTP/1.1
This is just as valid a request for a URL, and it has more obviously nothing to do with files.
The web server is an application listening on a port, accepting HTTP requests coming in on that port and returning a response. A web server is entirely free to r...
If REST applications are supposed to be stateless, how do you manage sessions?
...ia, REST itself is defined to be Representational State Transfer . I therefore don't understand all this stateless gobbledeygook that everyone keeps spewing.
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Google OAuth 2 authorization - Error: redirect_uri_mismatch
...ient ID: and Client Secret to my app and tried to log in with Google.
Unfortunately, I got the error message:
36 Answers...
Hidden Features of MySQL
...t recently started to use MySQL with my web applications, and I'm hungry for knowledge.
20 Answers
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Create objective-c class instance by name?
...o create a variable, then the compiler will verify that the class exists.
For example, in your .h:
@property Class NameOfClass;
and then in your .m:
id object = [[NameOfClass alloc] init];
If you mistyped the class name or if it doesn't exist, you'll get an error at compile time. Also I think...