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Best way to select random rows PostgreSQL
...e or the recursion may run dry before the limit is reached - or we have to start with a large enough buffer which defies the purpose of optimizing performance.
Duplicates are eliminated by the UNION in the rCTE.
The outer LIMIT makes the CTE stop as soon as we have enough rows.
This query is care...
bool operator ++ and --
... before this is an issue. With -- though it will only result in false if I started with a value of 1 for true, or started with 0 and used ++ precisely once before.
This is different if we start with a value that is just a few below 0. Indeed, in such a case we might want ++ to result in the false va...
How to jump back to NERDTree from file in tab?
... seeing? They're called windows in vim parlance. All the window commands start with CTRL-W. To move from adjacent windows that are left and right of one another, you can change focus to the window to the left of your current window with CTRL-w h, and move focus to the right with CTRL-w l. Likewi...
Get day of week in SQL Server 2005/2008
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anyone glancing over this - note that the default start of week is sunday. Look at @Sung's answer for how to change that safely
– JonnyRaa
Mar 31 '14 at 9:55
...
Android search with Fragments
...en the user executes a search in the search dialog or widget, the
system starts your searchable activity and delivers it the search
query in an Intent with the ACTION_SEARCH action. Your searchable
activity retrieves the query from the intent's QUERY extra, then
searches your data and presen...
Bomb dropping algorithm
...optimal solution. The first won't make sense without the second, so I'll
start with the why.
If you think of bombing the rectangle (assume a big rectangle - no edge cases yet)
you can see that the only way to reduce the hollow rectangle of squares on the
perimeter to 0 is to bomb either the peri...
Math - mapping numbers
...de to get the ratio between the sizes of the two ranges, then subtract the starting value of your inital range, multiply by the ratio and add the starting value of your second range. In other words,
R = (20 - 10) / (6 - 2)
y = (x - 2) * R + 10
This evenly spreads the numbers from the first range ...
How to create a Menubar application for Mac
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I've found Codebox's Popup to be a great starting point. It is ripe for forking on Github.
Though it works nicely, they do note on their site...
P. S. In Lion, Apple is adding a new class for popovers like in iOS.
So, after OS X 10.7 is released, you would...
What are the downsides to using Dependency Injection? [closed]
...h needs slightly different dependencies - tough, you're locked in. Time to start writing some adaptors for those dependencies instead (and a bit more overhead and another layer of abstraction).
– Steve314
Feb 10 '11 at 17:59
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Use CSS3 transitions with gradient backgrounds
...und-repeat: repeat-x;
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff50abdf', endColorstr='#ff1f78aa', GradientType=0);
background-repeat: repeat-y;
background-size: 100% 90px;
background-position: 0 -30px;
-webkit-transition: all 0.2s linear;
-moz-transition: al...