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Count(*) vs Count(1) - SQL Server
..._GUID() in Oracle is quite computation intensive function.
In my test database, t_even is a table with 1,000,000 rows
This query:
SELECT COUNT(SYS_GUID())
FROM t_even
runs for 48 seconds, since the function needs to evaluate each SYS_GUID() returned to make sure it's not a NULL.
However, t...
do { … } while (0) — what is it good for? [duplicate]
...n are fairly rare, but they do exist. One which springs to mind is a menu-based console application:
do {
char c = read_input();
process_input(c);
} while (c != 'Q');
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What size should TabBar images be?
...lines:
@1x : about 25 x 25 (max: 48 x 32)
@2x : about 50 x 50 (max: 96 x 64)
@3x : about 75 x 75 (max: 144 x 96)
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System.Timers.Timer vs System.Threading.Timer
...nt sinks
at regular intervals. The class is intended for use as a server-based
or service component in a multithreaded environment; it has no user
interface and is not visible at runtime.
System.Threading.Timer,
which executes a single callback method on a thread pool thread at
regular i...
Why is Double.MIN_VALUE in not negative
...y small positive quantity in maths / physics. Go chose SmallestNonzeroFloat64 for instance.
– aioobe
Aug 28 '17 at 6:14
...
Fast way to get image dimensions (not filesize)
...xImageString .= sprintf("%02x", ord($ByteStream[$i]));
if ($Salto==64){
$this->HexImageString .= "\n";
$Salto = 0;
}
}
}
}
private function Byte2PosInt($Byte08,$Byte00) {
return ((ord($Byte08) & 0xFF) << 8)|((ord($Byte00) & 0xF...
How to round the minute of a datetime object
...-01-01 01:03:34.285714285
7 2019-01-01 01:04:00.000000000
dtype: datetime64[ns]
>>> ts.dt.round('1min')
0 2019-01-01 01:01:00
1 2019-01-01 01:01:00
2 2019-01-01 01:02:00
3 2019-01-01 01:02:00
4 2019-01-01 01:03:00
5 2019-01-01 01:03:00
6 2019-01-01 01:04:00
7 2019-01-01 0...
Font Awesome not working, icons showing as squares
...
If you use the Data URI Scheme with a base64 version of the font (can easily convert online), then you don't have to worry about proper file path and resource hosting.
– RenaissanceProgrammer
Apr 21 '15 at 19:13
...
How To: Best way to draw table in console app (C#)
...n now find and improve the following code in github!
I wrote this class based on some ideas here. The columns width is optimal, an it can handle object arrays with this simple API:
static void Main(string[] args)
{
IEnumerable<Tuple<int, string, string>> authors =
new[]
{
...
Adding git branch on the Bash command prompt
...
164
git 1.9.3 or later: use __git_ps1
Git provides a shell script called git-prompt.sh, which incl...