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Is it possible to specify condition in Count()?
...an use the fact that the count aggregate only counts the non-null values:
select count(case Position when 'Manager' then 1 else null end)
from ...
You can also use the sum aggregate in a similar way:
select sum(case Position when 'Manager' then 1 else 0 end)
from ...
...
Html.DropdownListFor selected value not being set
How can I set the selected value of a Html.DropDownListFor? I've been having a look online and have seen that it can be achieved by using the fourth parameter so like the below:
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MongoDB SELECT COUNT GROUP BY
I am playing around with MongoDB trying to figure out how to do a simple
7 Answers
7
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How to express a NOT IN query with ActiveRecord/Rails?
...rums, lambda { |forums| { :conditions => ['forum_id not in (?)', forums.select(&:id).join(',')] }
# in your controller
Topic.not_in_forums(@forums)
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Catch Ctrl-C in C
... (1)
pause();
return 0;
}
void INThandler(int sig)
{
char c;
signal(sig, SIG_IGN);
printf("OUCH, did you hit Ctrl-C?\n"
"Do you really want to quit? [y/n] ");
c = getchar();
if (c == 'y' || c == 'Y')
exit(0);
else
signa...
How big can a user agent string get?
... msdn.microsoft.com/en-us/library/ms187993(v=sql.90).aspx Instead, use NVARCHAR(MAX). Source: stackoverflow.com/questions/564755/…
– Matt Roy
Aug 14 '13 at 14:54
3
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How to style the option of an html “select” element?
...ed via CSS.
There are replacement plug-ins/libraries that look like a <select> but are actually composed of regular HTML elements that CAN be styled.
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SQL Server: What is the difference between CROSS JOIN and FULL OUTER JOIN?
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select COUNT_BIG(*) FROM Traffic t CROSS JOIN Recipient r and SELECT COUNT_BIG(*) FROM Traffic t FULL JOIN Recipient r ON (1=1) they are the same.
– urlreader
Sep 20 '13 at 21:02
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Throw keyword in function's signature
...lowing code?
#include <iostream>
void throw_exception() throw(const char *)
{
throw 10;
}
void my_unexpected(){
std::cout << "well - this was unexpected" << std::endl;
}
int main(int argc, char **argv){
std::set_unexpected(my_unexpected);
try{
throw_excepti...
“register” keyword in C?
...at the variable does not alias with
anything else in the program (not even char's).
That can be exploited by modern compilers in a variety of situations, and can help the compiler quite a bit in complex code - in simple code the compilers can figure this out on their own.
Otherwise, it serves no p...