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mysql Foreign key constraint is incorrectly formed error
... of the details, but I had a composite key with this error which was fixed by adding individual unique indexes for the columns.
– Halvor Holsten Strand
Jan 3 '19 at 12:44
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Pass a PHP array to a JavaScript function [duplicate]
...t;;? Won't PHP encode the JSON object securely in a way that it's parsable by the script?
– YMMD
May 4 '12 at 14:43
Ye...
How to get Activity's content view?
...
this.getWindow().getDecorView().findViewById(android.R.id.content)
or
this.findViewById(android.R.id.content)
or
this.findViewById(android.R.id.content).getRootView()
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how to read System environment variable in Spring applicationContext
...ned with java ... -Denv=QA should solve your problem.
Note also a comment by @yiling:
In order to access system environment variable, that is OS level
variables as amoe commented, we can simply use "systemEnvironment"
instead of "systemProperties" in that EL. Like
#{systemEnvironment['ENV...
Check play state of AVPlayer
...an:
"track changes in the position of the playhead in an AVPlayer object" by using addPeriodicTimeObserverForInterval:queue:usingBlock: or addBoundaryTimeObserverForTimes:queue:usingBlock:.
Example is from Apple:
// Assume a property: @property (retain) id playerObserver;
Float64 durationSecond...
Can we have multiple in same ?
...ment after the tbody if you like. (They neatly side-stepped the DTD aspect by saying they don't provide one.) :-)
– T.J. Crowder
Jul 11 '13 at 17:51
5
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How can I get column names from a table in Oracle?
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You can add "ORDER by column_id" in case you want to retrieve them in the same order they were created in the table. Here are some other relevant column data from the table docs.oracle.com/cd/B19306_01/server.102/b14237/…
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How can I find a specific element in a List?
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Use a lambda expression
MyClass result = list.Find(x => x.GetId() == "xy");
Note: C# has a built-in syntax for properties. Instead of writing getter and setter methods (as you might be used to from Java), write
private string _id;
public string Id
{
get
{
return _i...
LINQ - Left Join, Group By, and Count
...tId equals c.ChildParentId into j1
from j2 in j1.DefaultIfEmpty()
group j2 by p.ParentId into grouped
select new { ParentId = grouped.Key, Count = grouped.Count(t=>t.ChildId != null) }
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i...
Join between tables in two different databases?
...t in the SELECT line you specify which table columns you are using, either by full reference, or by alias. Any of the following will work:
SELECT *
SELECT t1.*,t2.column2
SELECT A.table1.column1, t2.*
etc.
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