mysql - how to express taxonomy-like relationships with a relational diagram -

-

I am trying to represent a simple classification scheme through a relational database. Or more specifically, I am trying to figure out whether this is a good idea or not.

When I look at an image like I just shut down Google, then I'm one of the many organizations that this amphibia is going to be completely coincidental because I am not biologist.

"itemprop =" text "> < P> Just one example: create a column for the same table case forein key parent and column, the node at the top level is 1 and the parent is zero;


Comments

Post a Comment

Popular posts from this blog

c++ - C/pp Sockets, recv()/send() works only under gdb -

-
Edit: In the socket: The CanReceive () argument was the reason I was checking the input 1 millisecond While stepping into GDB, everything worked out. I have a problem with C sock send () / recv () do nothing if they are in non-debug mode. Even if std :: cout can not return their return value for some reason std :: cout is not working in my method I std: : Cerr can not even make a mistake It does not make sense to check that in GDB, because everything works perfectly as a virus in non-debug mode. C does not. //b - buffer // s - size // sd - socket descriptor int32_t TCP :: reception (char * b, uint32_t s) {error :: critical. SetErrorNumber (error: List :: noor); If (! Socket :: valid (sd)) {error :: serious .sitemember (error :: list :: invalid socket); Return -1; } If (Disconnect ()) {Error :: Critical. SetErrorNumber (Error :: List :: Notepanked); Return -1; } If returned (! Socket :: canvasive (SD, readtimeout)) incorrect; If (! B) {B = new four [S + 1]; Std :: mem...
Read more

GO: Serve static pages -

-
I'm trying to display a static page with Go. Go: Package main import "net / http" function main () {fs: = http.FileServer (http.Dir ("static / house")) Http: .handle ("/", fs) http.ListenAndServe (": 4747", zero)} directory: project / stable home Html edit.html project.go When I run it, the web page displays links to edit.html and home.html instead of displaying a static page from home.html is. What am I doing wrong. Is this the best way to serve files? I know that there are other ways like From the HTML / templates package, but I'm not sure what is the difference between each of these methods and when. Thanks! fancy main () {http.Handle ("/", http.FileServer (Http) .ir ("static")) http.ListenAndServe (": 4747", zero)} You do not need static / home , just Static . and when you do not have index.html in / static , the directory instead Content appears. Just change the name of...
Read more

objective c - How to open front/back camera at the same time in iOS developing? -

-
I want to use the front and rear camera at the same time in iOS development: when I take a photo back After the camera, the front camera can be opened and another can take a photo. By the way, these two photos are in a picture: vertical arrangement. Has anyone done this before? UIImagePickerController to take the picture, and to determine which camera is used Is in. / P> To merge the pictures, I found an example through search (its recommendation in the future)
Read more