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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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How to check whether a string is Base64 encoded or not
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Try like this for PHP5
//where $json is some data that can be base64 encoded
$json=some_data;
//this will check whether data is base64 encoded or not
if (base64_decode($json, true) == true)
{
echo "base64 encoded";
}
e...
String contains - ignore case [duplicate]
...You can use
org.apache.commons.lang3.StringUtils.containsIgnoreCase(CharSequence str,
CharSequence searchStr);
Checks if CharSequence contains a search CharSequence irrespective of
case, handling null. Case-insensitivity is defined as by
String.equalsIg...
Adding a column to a data.frame
..." section of the relevant help text, [[.data.frame.
Data frames can be indexed in several modes. When [ and [[ are used with a single vector index (x[i] or x[[i]]), they index the data frame as if it were a list.
my.dataframe["new.col"] <- a.vector
my.dataframe[["new.col"]] <- a.vector
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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...
How to remove globally a package from Composer?
I ran this command to install globally PHPUnit :
2 Answers
2
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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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iPhone and OpenCV
...ered Sep 30 '12 at 15:21
Rui MarquesRui Marques
6,53633 gold badges4343 silver badges8181 bronze badges
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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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