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SQL : BETWEEN vs =
...tcha is that lower and upper bounds do need to be specified in the correct order (i.e. BETWEEN low AND high).
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Twitter Bootstrap - how to center elements horizontally or vertically
...play:block or display:flex elements that have a defined width, (%, vw, px, etc..). Flexbox is used by default on grid columns, so there are also various flexbox centering methods.
Demo Bootstrap 4 Horizontal Centering
For vertical centering in BS4 see https://stackoverflow.com/a/41464397/171456
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Converting int to bytes in Python 3
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From python 3.2 you can do
>>> (1024).to_bytes(2, byteorder='big')
b'\x04\x00'
https://docs.python.org/3/library/stdtypes.html#int.to_bytes
def int_to_bytes(x: int) -> bytes:
return x.to_bytes((x.bit_length() + 7) // 8, 'big')
def int_from_bytes(xbytes: bytes) -> i...
How to add new column to MYSQL table?
...text box as such in the SQL statement. You must make sure you escape it in order to avoid an SQL injection vulnerability.
– Costi Ciudatu
Feb 1 '14 at 21:56
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How can I get the Google cache age of any URL or web page? [closed]
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Is this object-lifetime-extending-closure a C# compiler bug?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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gem install: Failed to build gem native extension (can't find header files)
...o get the appropriate Ruby headers. The same goes for ruby2.1 and ruby2.2, etc. For example:
$ sudo apt-get install ruby2.2-dev
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How to make HTML table cell editable?
... if you make the table editable, in Mozilla at least, you can delete rows, etc.
You'd also need to check whether your target audience's browsers supported this attribute.
As far as listening for the changes (so you can send to the server), see contenteditable change events
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Check Whether a User Exists
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Why don't you simply use
grep -c '^username:' /etc/passwd
It will return 1 (since a user has max. 1 entry) if the user exists and 0 if it doesn't.
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Why does (0 < 5 < 3) return true?
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Order of operations causes (0 < 5 < 3) to be interpreted in javascript as ((0 < 5) < 3) which produces (true < 3) and true is counted as 1, causing it to return true.
This is also why (0 < 5 < 1) returns...