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SQL Logic Operator Precedence: And and Or
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And has precedence over Or, so, even if a <=> a1 Or a2
Where a And b
is not the same as
Where a1 Or a2 And b,
because that would be Executed as
Where a1 Or (a2 And b)
and what you want, to make them the same, is the following (using parentheses ...
Are there any downsides to enabling git rerere?
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If you do a merge incorrectly, then discard it, then do the "same" merge again, it will be incorrect again. You can forget a recorded resolution, though. From the documentation:
git rerere forget <pathspec>
This reset...
Input and output numpy arrays to h5py
...se output is a sized matrix, whose entries are all of the type float . If I save it with the extension .dat the file size is of the order of 500 MB. I read that using h5py reduces the file size considerably. So, let's say I have the 2D numpy array named A . How do I save it to an h5py file?...
How to get the size of a string in Python?
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If you are talking about the length of the string, you can use len():
>>> s = 'please answer my question'
>>> len(s) # number of characters in s
25
If you need the size of the string in bytes, you need s...
Difference between staticmethod and classmethod
What is the difference between a function decorated with @staticmethod and one decorated with @classmethod ?
27 Answers
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Classes vs. Modules in VB.NET
...e a private constructor to prevent instantiation and the NotInheritable modifier. Slightly uglier than a plain old Module, but has the same effect. Thanks for the pointer to the use of Modules in the Framework; I'll look into that.
– Tom Juergens
May 19 '09 at ...
Django Admin - Disable the 'Add' action for a specific model
... 3 security permissions for each model:
Create (aka add)
Change
Delete
If your logged in as Admin, you get EVERYTHING no matter what.
But if you create a new user group called "General Access" (for example) then you can assign ONLY the CHANGE and DELETE permissions for all of your models.
Then...
How to flip background image using CSS?
...rm: scaleX(-1);
filter: FlipH;
-ms-filter: "FlipH";
}
jsFiddle.
If you want to flip vertically instead...
a:visited {
-moz-transform: scaleY(-1);
-o-transform: scaleY(-1);
-webkit-transform: scaleY(-1);
transform: scaleY(-1);
filter: FlipV;
-ms-filter: "FlipV";
}
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embedding image in html email
I'm trying to send a multipart/related html email with embedded gif images. This email is generated using Oracle PL/SQL. My attempts have failed, with the image showing up as a red X (in Outlook 2007 and yahoo mail)
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scp or sftp copy multiple files with single command
I'd like to copy files from/to remote server in different directories.
For example, I want to run these 4 commands at once.
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