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Count number of records returned by group by
How do I count the number of records returned by a group by query,
13 Answers
13
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How do HashTables deal with collisions?
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the above explanation is high level, I don't think it makes much difference as to linked list vs. array. I think a binary search tree would be overkill. Also I think if you dig into things like ConcurrentHashMap and others there any many low level implement detail...
How do I get the coordinates of a mouse click on a canvas element?
...X || e.pageY) {
x = e.pageX;
y = e.pageY;
}
else {
x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
y = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
}
x -= gCanvasElement.offsetLeft;
y -= gCanvasElement.offsetTop;
Worked perf...
Throwing exceptions from constructors
..., throwing an exception from the failed constructor is the standard way of doing this. Read this FAQ about Handling a constructor that fails for more information. Having a init() method will also work, but everybody who creates the object of mutex has to remember that init() has to be called. I feel...
How do I get the backtrace for all the threads in GDB?
...x "thread apply all bt" -ex "quit" > output.log
– Doomsday
Mar 28 '18 at 9:32
1
You can shorte...
Start an Activity with a parameter
... null, lets say you want to start this activity from another place and you do it the standard way, with no params. It will throw a NPE. You should always consider this params optional.
– Gaspar de Elias
Aug 16 '12 at 9:30
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How do you copy a record in a SQL table but swap out the unique id of the new row?
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The id-column is an identity column (in my table) so I don't care about the value. I just want a new record holding the same values as the "old" one.
– Jonas
Feb 22 '13 at 14:26
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Android TextView Justify Text
How do you get the text of a TextView to be Justified (with text flush on the left- and right- hand sides)?
27 Answers
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How do I import CSV file into a MySQL table?
...ce import dialogs for this kind of thing.
My favourite for the job is Windows based HeidiSQL. It gives you a graphical interface to build the LOAD DATA command; you can re-use it programmatically later.
Screenshot: "Import textfile" dialog
To open the Import textfile" dialog, go to Tools > ...
Jquery select all elements that have $jquery.data()
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You could do
$('[data-myAttr!=""]');
this selects all elements which have an attribute data-myAttr which is not equal to '' (so it must have been set);
you could also use filter()
$('*').filter(function() {
return $(this).dat...