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How to add a primary key to a MySQL table?
... Column
If you want to add a primary key constraint to an existing column all of the previously listed syntax will fail.
To add a primary key constraint to an existing column use the form:
ALTER TABLE `goods`
MODIFY COLUMN `id` INT(10) UNSIGNED PRIMARY KEY AUTO_INCREMENT;
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How to print a date in a regular format?
...do with that?
Well, when you manipulate dates, keep using the date objects all long the way. They got thousand of useful methods and most of the Python API expect dates to be objects.
When you want to display them, just use str(). In Python, the good practice is to explicitly cast everything. So jus...
Algorithm to calculate the number of divisors of a given number
...ere's a Dr. Math that explains what exactly it is you need to do mathematically.
Essentially it boils down to if your number n is:
n = a^x * b^y * c^z
(where a, b, and c are n's prime divisors and x, y, and z are the number of times that divisor is repeated)
then the total count for all of the di...
How to create EditText with rounded corners? [closed]
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Except that your solution uses the same drawable for all states. A regular EditText has different backgrounds for focused, disabled, pressed, and selected, besides the default. Focused, in particular, may be important going forward if we get some Android devices that lack touch...
Why does npm install say I have unmet dependencies?
I have a node package. When I run npm install from the package root, it installs a bunch of things, but then prints several error messages that look like this:
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RegEx to parse or validate Base64 data
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The simplest solution would be to strip out all whitespace (which is ignored as per the RFC) before validation.
– Ben Blank
Jan 24 '09 at 1:35
2
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Remove leading zeros from a number in Javascript [duplicate]
...console.log(`Subtracting zero conversion result: ${parsedNumber}`);
All results will be incorrect.
That's because, when converted, the numString value is greater than Number.MAX_SAFE_INTEGER. i.e.,
99999999999999999999 > 9007199254740991
This means all operation performed with the as...
HTTP header line break style
...0)>
HTTP/1.1 defines the sequence CR LF as the end-of-line marker for all protocol elements except the entity-body
RFC2616 was technically obsoleted by RFC7230, but it makes no drastic changes and again calls out CRLF as the delimiter in section 3, and that RFC references RFC5234, Appendix B....
How to make a node.js application run permanently?
On a Debian server, I installed Node.js. I understand how to launch an app from putty with this command line:
19 Answers
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Replace one substring for another string in shell script
...ing/Suzi/$secondString}"
# prints 'I love Sara and Marry'
To replace all occurrences, use ${parameter//pattern/string}:
message='The secret code is 12345'
echo "${message//[0-9]/X}"
# prints 'The secret code is XXXXX'
(This is documented in the Bash Reference Manual, §3.5.3 "She...