database modelling challenges -


i trying model student database unsure of how represent student, assessment taken, , student results. below description of scenario:

several students offering 1 or more subjects, these subjects have 1 or more assessments. how represent students, subject offered, assessment taken , results of assessment taken students? have attached copy of design made far.

  • my intension design database querying of student,subject,assessment,
    , assessment result can possible , easy.

full-size image

enter image description here

imho should have ternary relationship between student, subject , assessment owning assessment result. necessary in case student can have many subject same assessment.

otherwise if assessment have many subject 1 given student have different choice :

  • can keep ternary.
  • can otherwise store subject id , result in student - assessment relationship table
  • or student id , result in subject - assessment table.

    this should depend on way query tables (all subject assessment a, students subject x assessment a, results subject x assessment a, etc...


    • Comments

    Post a Comment

    Popular posts from this blog

    blackberry 10 - how to add multiple markers on the google map just by url? -

    i have android application, want convert blackberry 10 , google map needed in app,but blackberry 10 not support googlemap , blackberry developer web site supply way replace it.the sample below: @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); webview webview = (webview) findviewbyid(r.id.mywebview); webview.getsettings().setjavascriptenabled(true); webview.loadurl("http://maps.google.com/?ll=36.97, -122&lci=bike&z=13&t=p"); } i cannot understand it,i not know how add multiple markers on googlemap via url? can me? this worked me map shown in webview.
    Read more

    php - guestbook returning database data to flash -

    i've been struggling problem long , unable make work, hope can me it. first, know php files correct , mysql database works fine. in flash, able submit comment database comments not display. did many tests such making returned_database flash separately , worked fine - can see old comments. long combine submitting 1 , returning 1 together, flash doesn't show comments more. put lower version flash effects on frame thinking doesn't collaborate returning flash, submitting flash works fine. since pretty complex problem hard me copy actionscript code because on different frames in flash. if has ideas fixing maybe can send file you?
    Read more

    delphi - Dynamic file type icon -

    i want register file type in windows , make program delphi draw icon of file according contents (something custom icon format). how can this? thanks nortd , user539484 comments, searched internet "shell icon handler delphi" , found sample here , , shell+ components has component this.
    Read more