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How can you represent inheritance in a database?
... to the base table. Example:
CREATE TABLE policies (
policy_id int,
date_issued datetime,
-- // other common attributes ...
);
CREATE TABLE policy_motor (
policy_id int,
vehicle_reg_no varchar(20),
-- // other attributes specific to motor insurance ....
Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths - why?
....
[ForeignKey("StageId")]
public virtual Stage Stage { get; set; }
public int? StageId { get; set; }
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Random number from a range in a Bash Script
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In this example, jot has unfair distribution for the interval's minimum and maximum (i.e., 2000 and 65000). In other words, the min and max will be generated less frequently. See my jot answer for details and a workaround.
– Clint Pachl
No...
Scala list concatenation, ::: vs ++
...ts, there's no difference, but in the case of 3 or more, you have a good point, and I confirmed it with a quick benchmark. However, if you're worried about efficiency, x ::: y ::: z should be replaced with List(x, y, z).flatten. pastebin.com/gkx7Hpad
– Luigi Plinge
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Image comparison - fast algorithm
...ne of 6 buckets between 0 and PI (since edges have 180-degree symmetry, we converted angles between -PI and 0 to be between 0 and PI). After tallying up the number of edge points in each direction, we have an un-normalized histogram representing texture direction, which we normalized by dividing ea...
Resize image in PHP
...hope is will work for you.
/**
* Image re-size
* @param int $width
* @param int $height
*/
function ImageResize($width, $height, $img_name)
{
/* Get original file size */
list($w, $h) = getimagesize($_FILES['logo_im...
Finding Number of Cores in Java
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int cores = Runtime.getRuntime().availableProcessors();
If cores is less than one, either your processor is about to die, or your JVM has a serious bug in it, or the universe is about to blow up.
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'typeid' versus 'typeof' in C++
...eof. typeof works on types too while decltype doesn't. For example, typeof(int) is int while decltype(int) is an error.
– Shahbaz
Aug 10 '17 at 19:23
1
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Sending images using Http Post
... = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
for(int index=0; index < nameValuePairs.size(); index++) {
if(nameValuePairs.get(index).getName().equalsIgnoreCase("image")) {
// If the key equals to "image", we use FileBody to transfer the data
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How do I make XAML DataGridColumns fill the entire DataGrid?
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Gives an Error Sting cannot be converted to '*'
– co2f2e
Feb 5 '16 at 9:07
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