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how to exclude null values in array_agg like in string_agg using postgres?
...UNC = fn_array_agg_notnull,
STYPE = ANYARRAY,
INITCOND = '{}'
);
Calling the second is (naturally) a little nicer looking than the first:
select array_agg_notnull(v) from x;
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Programmatically fire button click event?
Is there a way to programmatically fire a button click event? I have a button placed there in an UIView, and in a particular scenario i want to click the button via code, not manually as a user. Is it possible in iOS development? Please provide your suggestions and guide me how to do that.
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Why is using onClick() in HTML a bad practice?
...sadvantage is discoverability: looking at the HTML does not tell you which callbacks are attached to it, not even whther there are any.
– Michael Borgwardt
Nov 28 '12 at 8:17
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Load and execution sequence of a web page?
...parsing and interpreting the markup language and thus must be able to make calls to the other 2 components.
For example when the parser comes across this line:
<a href="#" onclick="alert('test');return false;" style="font-weight:bold">a hypertext link</a>
The parser will make 3 calls, t...
Update relationships when saving changes of EF4 POCO objects
...nization on single entity is easy task. You just need to attach entity and call AddObject for inserting, DeleteObject for deleting or set state in ObjectStateManager to Modified for updating. The real pain comes when you have to deal with object graph instead of single entity. This pain is even wors...
How do I use ROW_NUMBER()?
...bases, despite their name, don't have a formal ordering, so if you want to call a row "1" or "10" or "1337", you need to order them first using an ORDER BY clause, which is the one that goes in the OVER (ORDER BY X) clause.
– Wtrmute
Sep 13 '17 at 0:25
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Get exit code of a background process
I have a command CMD called from my main bourne shell script that takes forever.
12 Answers
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How to stop event bubbling on checkbox click
...Use the method
isDefaultPrevented to know whether
this method was ever called (on that
event object).
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Scheduling recurring task in Android
...sleep as soon as your onReceive() method completes. If your alarm receiver called Context.startService(), it is possible that the phone will sleep before the requested service is launched. To prevent this, your BroadcastReceiver and Service will need to implement a separate wake lock policy to ensur...
What does SynchronizationContext do?
...it. The running thread can be associated with a synchronization context by calling the static SynchronizationContext.SetSynchronizationContext method, and the current context of the running thread can be queried via the SynchronizationContext.Current property.
Despite what I just wrote (each thread ...