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What is the difference between JOIN and UNION?
What is the difference between JOIN and UNION ? Can I have an example?
15 Answers
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Allowed characters in Linux environment variable names
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From The Open Group:
These strings have the form
name=value; names shall not contain
the character '='. For values to be
portable across systems conforming to
IEEE Std 1003.1-2001, the value shall
be composed of characters from the
portable...
LINQ Select Distinct with Anonymous Types
... Extensions cannot handle of type object and object. If the both object is string it still return the duplicate rows. Try the FirstName is typeof object and assign with the same string there.
– CallMeLaNN
May 26 '11 at 5:50
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What is the purpose of XORing a register with itself? [duplicate]
... of buffer overflows, etc. Why avoid the 0 ? Well, 0 represents the end of string in c/c++ and the shell code would be truncated if the mean of exploitation is a string processing function or the like.
Btw im referring to the original question: "Any reason to do a “xor eax, eax”?" not what the ...
Inserting data into a temporary table
After having created a temporary table and declaring the data types like so;
12 Answers
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Android and setting alpha for (image) view alpha
...n. The alternative is to use View.setAlpha(float) whose XML counterpart is android:alpha. It takes a range of 0.0 to 1.0 instead of 0 to 255. Use it e.g. like
<ImageView android:alpha="0.4">
However, the latter in available only since API level 11.
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Batch files - number of command line arguments
...iant of for only works for arguments that look like file names, not option strings such as -?. Using quotes (for %%i in ("%*") ...) works for argument like -? but again fails for quoted arguments because of nested quotes. The only robust way seems to involve shift...
– Ferdin...
Mongoose, Select a specific field with find
...r);
res.send(someValue);
});
//this eliminates the .select() and .exec() methods
};
In case you want most of the Schema fields and want to omit only a few, you can prefix the field name with a -. For ex "-name" in the second argument will not include name field in the doc whereas th...
Is there a way to detect if a browser window is not currently active?
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Wouldn't using a strict comparison operator on the string 'undefined' instead of the undefined keyword cause false positives in the above code?
– Jonathon
Jul 16 '16 at 0:23
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MySql Table Insert if not exist otherwise update
... description bugs.mysql.com/bug.php?id=58637
– broadband
Sep 2 '14 at 13:28
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