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what is the difference between GROUP BY and ORDER BY in sql
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ORDER BY alters the order in which items are returned.
GROUP BY will aggregate records by the specified columns which allows you to perform aggregation functions on non-grouped columns (such as SUM, COUNT, AVG, etc).
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ORDER BY the IN value list
...s c
join (
values
(1,1),
(3,2),
(2,3),
(4,4)
) as x (id, ordering) on c.id = x.id
order by x.ordering
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How to do a newline in output
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It seems that both Ruby and PHP do not expand escape sequences in single quoted strings.
– kjagiello
Dec 31 '13 at 15:02
2
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How to change the default GCC compiler in Ubuntu?
...s.
It assigns values to every software of a family, so that it defines the order in which the applications will be called.
It is used to maintain different versions of the same software on a system. In your case, you will be able to use several declinations of gcc, and one will be favoured.
To f...
Items in JSON object are out of order using “json.dumps”?
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Both Python dict (before Python 3.7) and JSON object are unordered collections. You could pass sort_keys parameter, to sort the keys:
>>> import json
>>> json.dumps({'a': 1, 'b': 2})
'{"b": 2, "a": 1}'
>>> json.dumps({'a': 1, 'b': 2}, sort_keys=True)
'{"a"...
Android Center text on canvas
...ing the center of the baseline of the text, at the center of the view. In order to center the text at some point, x, y, you need to calculate the center of the text, and put that at the point.
This method will draw text centered at the point x, y. If you pass it the center of your view, it will d...
Link to add to Google calendar
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Order of event handler execution
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Currently, they are executed in the order they are registered. However, this is an implementation detail, and I would not rely on this behavior staying the same in future versions, since it is not required by specifications.
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iPad/iPhone hover problem causes the user to double click a link
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Remove hover effects on mouseleave, touchmove and click.
Background
In order to simulate a mouse, browsers such as Webkit mobile fire the following events if a user touches and releases a finger on touch screen (like iPad) (source: Touch And Mouse on html5rocks.com):
touchstart
touchmove
touch...
How to pass a function as a parameter in Java? [duplicate]
...t of this post describes what we used to have to do in the bad old days in order to implement this functionality.
Typically you declare your method as taking some interface with a single method, then you pass in an object that implements that interface. An example is in commons-collections, where y...