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How to revert a “git rm -r .”?
...- path/to/file
git checkout -- path/to/file
This will first recreate the index entries for path/to/file and recreate the file as it was in the last commit, i.e.HEAD.
Hint: one may pass a commit hash to both commands to recreate files from an older commit. See git reset --help and git checkout --h...
mysql Foreign key constraint is incorrectly formed error
...ieve it does not necessarily have to be a primary key, but it MUST have an index. Primary keys automatically get indexed.
– Itai
May 6 '18 at 7:23
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Database Design for Tagging
...tion well. However, I'm not convinced it's a good idea to implement bitmap indexing "manually", like digiguru suggests: It sounds like a complicated situation whenever new tags are added(?) But some DBMSes (including Oracle) offer bitmap indexes which may somehow be of use, because a built-in indexi...
What is PAGEIOLATCH_SH wait type in SQL Server?
...o large scans over big tables. It almost never happens in queries that use indexes efficiently.
If your query is like this:
Select * from <table> where <col1> = <value> order by <PrimaryKey>
, check that you have a composite index on (col1, col_primary_key).
If you don't hav...
Algorithm to get the excel-like column name of a number
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Here's a nice simple recursive function (Based on zero indexed numbers, meaning 0 == A, 1 == B, etc)...
function getNameFromNumber($num) {
$numeric = $num % 26;
$letter = chr(65 + $numeric);
$num2 = intval($num / 26);
if ($num2 > 0) {
return getNameFro...
Access multiple elements of list knowing their index
I need to choose some elements from the given list, knowing their index. Let say I would like to create a new list, which contains element with index 1, 2, 5, from given list [-2, 1, 5, 3, 8, 5, 6]. What I did is:
...
How to stage only part of a new file with git?
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Whoa, all that update-index and hash-object business seems overly complicated. How about this instead:
git add -N new_file
git add -i
From git help add:
-N, --intent-to-add
Record only the fact that the path will be added later. An entry...
Short circuit Array.forEach like calling break
...irefox 1.5 also works really well. My example use case will be to find the index in an array of ranges[a,b] where a number is between a lower boundary and upper boundary pair, test and return true when found. for..of would be the next best solution though only for newer browsers.
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Array slices in C#
...0/.Net Core 3.0
Array slicing will be supported, along with the new types Index and Range being added.
Range Struct docs
Index Struct docs
Index i1 = 3; // number 3 from beginning
Index i2 = ^4; // number 4 from end
int[] a = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
Console.WriteLine($"{a[i1]}, {a[i2]...
Where do I put image files, css, js, etc. in Codeigniter?
...ws/
|---- controllers/
|- public/
|---- images/
|---- js/
|---- css/
|---- index.php
|---- .htaccess
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