Create a table into xwiki database

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1

I want to create a table into xwiki database if this is possible. My table is “Students” and the columns are:
name, gradeMath, gradeInfo, average (this column should calculate itself average and I shouldn’t insert a value in this column). What code should I write and where?
And if I want to insert a line in that table how to do it? (for example in Oracle I could write "insert into Students values (“Paula”, 10, 9)).

2

Normally you shouldn’t touche the xwiki database. Instead you should create xclasses and xobjects. See http://platform.xwiki.org/xwiki/bin/view/DevGuide/DataModel and http://platform.xwiki.org/xwiki/bin/view/DevGuide/FAQTutorial/FAQTutorialManual