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SQL SELECT speed int vs varchar
...at ints take up much less space than varchars.
This holds true both for unindexed and indexed access. The fastest way to go is an indexed int column.
As I see you've tagged the question postgreql, you might be interested in the space usage of different date types:
int fields occupy between 2 a...
How to get the current loop index when using Iterator?
...or to iterate through a collection
and I want to get the current element's index.
12 Answers
...
How can I find the length of a number?
..."Starting weissteinLength length.");
let startTime = Date.now();
for (let index = 0; index < iterations; index++) {
weissteinLength(Math.random() * maxSize);
}
console.log("Ended weissteinLength length. Took : " + (Date.now() - startTime ) + "ms");
// ------- String length slowest.
conso...
“unpacking” a tuple to call a matching function pointer
...tion, typename Tuple, size_t ... I>
auto call(Function f, Tuple t, std::index_sequence<I ...>)
{
return f(std::get<I>(t) ...);
}
template<typename Function, typename Tuple>
auto call(Function f, Tuple t)
{
static constexpr auto size = std::tuple_size<Tuple>::valu...
Stashing only un-staged changes in Git
...
git stash save has an option --keep-index that does exactly what you need.
So, run git stash save --keep-index.
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How to fetch the row count for all tables in a SQL SERVER database [duplicate]
...I.rows AS [ROWCOUNT] FROM sys.tables AS T INNER JOIN sys.sysindexes AS I ON T.object_id = I.id AND I.indid < 2 ORDER BY I.rows DESC
– Muhammad Sohail
May 25 '18 at 5:07
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How do I erase an element from std::vector by index?
...
@Pierre because the numerical index of a particular element is not the primary model of access, iterator is. All the functions that look at elements of a container use that container's iterators. E.g. std::find_if
– Caleth
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How can I get nth element from a list?
How can I access a list by index in Haskell, analog to this C code?
6 Answers
6
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Python: Find in list
...ult value])
Finding the location of an item
For lists, there's also the index method that can sometimes be useful if you want to know where a certain element is in the list:
[1,2,3].index(2) # => 1
[1,2,3].index(4) # => ValueError
However, note that if you have duplicates, .index always ...
How can I check in a Bash script if my local Git repository has changes?
...then
VN="$VN-mod"
fi
A quote from Git's GIT-VERSION-GEN:
git update-index -q --refresh
test -z "$(git diff-index --name-only HEAD --)" ||
VN="$VN-dirty"
It looks like you were copying that, but you just forgot that detail of quoting.
Of course, you could also just do this:
if git diff-ind...