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Pip freeze vs. pip list
...se pip list lists everything, and pip freeze installs everything installed by pip.
– karthikr
Sep 24 '13 at 14:55
Hm, ...
What exactly is a C pointer if not a memory address?
... to do pointer arithmetic with those numbers and all other things required by the standard.
– Alexey Frunze
Mar 1 '13 at 6:12
4
...
How to calculate number of days between two given dates?
...en.wikipedia.org/wiki/Leap_year#Algorithm
## if (year is not divisible by 4) then (it is a common Year)
#else if (year is not divisable by 100) then (ut us a leap year)
#else if (year is not disible by 400) then (it is a common year)
#else(it is aleap year)
return (year % 4 == 0 ...
Surrogate vs. natural/business keys [closed]
...tage of surrogate keys is that they are meaningless (cited as an advantage by some, but...). This sometimes forces you to join a lot more tables into your query than should really be necessary. Compare:
select sum(t.hours)
from timesheets t
where t.dept_code = 'HR'
and t.status = 'VALID'
and t.pr...
Commands executed from vim are not recognizing bash command aliases
...hin vim:
let $BASH_ENV = "~/.bash_aliases"
This solution was suggested by "Jakob". See the link below for the original. I tested this on Mac OS X 10.9 and it worked flawlessly!
vim -- not recognizing aliases when in interactive mode?
...
How can I use a file in a command and redirect output to the same file without truncating it?
...cause bash processes the redirections first, then executes the command. So by the time grep looks at file_name, it is already empty. You can use a temporary file though.
#!/bin/sh
tmpfile=$(mktemp)
grep -v 'seg[0-9]\{1,\}\.[0-9]\{1\}' file_name > ${tmpfile}
cat ${tmpfile} > file_name
rm -f ${...
UnboundLocalError on local variable when reassigned after first use
... the function. If a variable is assigned within a function, it is treated by default as a local variable. Therefore, when you uncomment the line you are trying to reference the local variable c before any value has been assigned to it.
If you want the variable c to refer to the global c = 3 assig...
DBMS_OUTPUT.PUT_LINE not printing
...
What is "it" in the statement "it just says the procedure is completed"?
By default, most tools do not configure a buffer for dbms_output to write to and do not attempt to read from that buffer after code executes. Most tools, on the other hand, have the ability to do so. In SQL*Plus, you'd need...
Detecting when user has dismissed the soft keyboard
...
I've been looking on several solution, this is by far the best!
– Friesgaard
Mar 20 '14 at 22:01
11
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How can I update window.location.hash without jumping the document?
...
There is a workaround by using the history API on modern browsers with fallback on old ones:
if(history.pushState) {
history.pushState(null, null, '#myhash');
}
else {
location.hash = '#myhash';
}
Credit goes to Lea Verou
...