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sql primary key and index
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The damage of unused indexes are very harmful indeed. For one thing, indexes eat up storage. For another thing, it slows down writes and updates. Always delete indexes that are not going to be used.
– Pacerier
Jul 6 '12 at 7:40
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Refresh image with a new one at the same url
...t will make the browser look again for the image instead of retrieving the one in the cache.
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Check if two unordered lists are equal [duplicate]
... the cleanest approach here. I think this answer ought to be the accepted one.
– Will
Oct 24 '13 at 11:05
2
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How serious is this new ASP.NET security vulnerability and how can I workaround it?
...us codes are set.
What's at stake?
If an attacker manage to use the mentioned exploit, he/she can download internal files from within your web application. Typically web.config is a target and may contain sensitive information like login information in a database connection string, or even link to...
What's the point of 'const' in the Haskell Prelude?
... Ahh so it's more of a 'function generator' - I use it with one argument, and it gives me a function (taking one argument) that always returns a constant value. So map (const 42) [1..5] results in [42, 42, 42, 42, 42].
– stusmith
Sep 13 '11 at 14...
Patterns for handling batch operations in REST web services?
...rt of each resource, you treat it as a bucket into which to put resources. One example was already posted. I adjusted it a little.
POST /mail?markAsRead=true
POSTDATA: ids=[0,1,2]
Basically, you are updating the list of mail marked as read.
You can also use this for assigning several items to th...
My attempt at value initialization is interpreted as a function declaration, and why doesn't A a(())
...rn 0;
}
int main() {
return output_result(eighty_four);
}
As I mentioned, C allows omitting argument names in header files, therefore the output_result would look like this in header file.
int output_result(int());
One argument in constructor
Don't you recognize that one? Well, let me rem...
How to handle exceptions in a list comprehensions?
...l the statements you want, so delegating the evaluation of the exception-prone sub-expression to a function, as you've noticed, is one feasible workaround (others, when feasible, are checks on values that might provoke exceptions, as also suggested in other answers).
The correct responses to the qu...
TypeScript function overloading
...erent if we compare to OO languages. In answer to another SO question, someone explained it with a nice example: Method overloading?.
Basically, what we are doing is, we are creating just one function and a number of declarations so that TypeScript doesn't give compile errors. When this code is com...
SQL - find records from one table which don't exist in another
...two tables:
This is the shortest statement, and may be quickest if your phone book is very short:
SELECT *
FROM Call
WHERE phone_number NOT IN (SELECT phone_number FROM Phone_book)
alternatively (thanks to Alterlife)
SELECT *
FROM Call
WHERE NOT EXISTS
(SELECT *
FROM Phone_book
...