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Does Foreign Key improve query performance?
...t least in SQL Server, the creation of an FK does not create an associated index, and you should create indexes on all FK fields to improve look up times.
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angular ng-repeat in reverse
..."alert in alerts.slice().reverse()" type="alert.type" close="alerts.splice(index, 1)">{{$index + 1}}: {{alert.msg}}</alert>
Update:
My answer was OK for old version of Angular.
Now, you should be using
ng-repeat="friend in friends | orderBy:'-'"
or
ng-repeat="friend in friends | ord...
In git, is there a simple way of introducing an unrelated branch to a repository?
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This doesn't do exactly what the asker wanted, because it populates the index and the working tree from <start_point> (since this is, after all, a checkout command). The only other action necessary is to remove any unwanted items from the working tree and index. Unfortunately, git reset --h...
Maintain/Save/Restore scroll position when returning to a ListView
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Try this:
// save index and top position
int index = mList.getFirstVisiblePosition();
View v = mList.getChildAt(0);
int top = (v == null) ? 0 : (v.getTop() - mList.getPaddingTop());
// ...
// restore index and position
mList.setSelectionFrom...
How to create a HashMap with two keys (Key-Pair, Value)?
...HashMap. But I want to access the elements from the HashMap based on Array Index. Something like:
12 Answers
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How to replace NaN values by Zeroes in a column of a Pandas Dataframe?
... Thanks. Is my understanding correct that in that answer an "indexer that sets" is the outermost indexing operation (executed just before the assignment. So any assignment that only uses a single indexer is guaranteed to be safe, making your code safe?
– max
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How to get arguments with flags in Bash
...arrays
declare -A arguments=();
declare -A variables=();
# declaring an index integer
declare -i index=1;
# any variables you want to use here
# on the left left side is argument label or key (entered at the command line along with it's value)
# on the right side is the variable name the value ...
How to unstage large number of files without deleting the content
...you have a pristine repo (or HEAD isn't set)[1] you could simply
rm .git/index
Of course, this will require you to re-add the files that you did want to be added.
[1] Note (as explained in the comments) this would usually only happen when the repo is brand-new ("pristine") or if no commits ha...
Why doesn't git recognize that my file has been changed, therefore git add not working
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I had a problem where once upon a time I set the git index to 'assume unchanged' on my file.
You can tell git to stop ignoring changes to the file with:
git update-index --no-assume-unchanged path/to/file
If that doesn't help a reset may be enough for other weird cases.
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Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
... 对应表达式 a <= b
__index(a, b) 对应表达式 a.b
__newindex(a, b, c) 对应表达式 a.b = c
__call(a, ...)&nb...