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Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails
I'm having a bit of a strange problem. I'm trying to add a foreign key to one table that references another, but it is failing for some reason. With my limited knowledge of MySQL, the only thing that could possibly be suspect is that there is a foreign key on a different table referencing the one I ...
How to remove item from list in C#?
I have a list stored in resultlist as follows:
8 Answers
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PHP - Extracting a property from an array of objects
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If you have PHP 5.5 or later, the best way is to use the built in function array_column():
$idCats = array_column($cats, 'id');
But the son has to be an array or converted to an array
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Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragme
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private static View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null)
parent.removeView(view);
}
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How to set radio button checked as default in radiogroup?
I have created RadioGroup and RadioButton dynamically as following:
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Filter dataframe rows if value in column is in a set list of values [duplicate]
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Use the isin method:
rpt[rpt['STK_ID'].isin(stk_list)]
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Remove duplicates in the list using linq
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var distinctItems = items.Distinct();
To match on only some of the properties, create a custom equality comparer, e.g.:
class DistinctItemComparer : IEqualityComparer<Item> {
public bool Equals(Item x, Item y) {
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How to check which locks are held on a table
How can we check which database locks are applied on which rows against a query batch?
6 Answers
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Correct way to use StringBuilder in SQL
I just found some sql query build like this in my project:
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How do I create a foreign key in SQL Server?
...ed" object creation code for SQL Server and foreign key decleration is seemingly different between SQL Server and Postgres. Here is my sql so far:
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