MODIFY PROJECT d:\xsgl\xsgl.pjx set default to d:\xsgl\data list set order to sno list set index to list index on sno to sno2 list dir *.idx seek "200217109" disp set index to student list set order to 1 list set order to sname list seek "bbb" disp set order to sno list index on sno tag aaa of student2 ascending list index on sname tag bbb of student2 ascending set order to 1 list set index to set index to student2 list set order to 1 list index on ssex+sno tag ccc of student3 ascending list index on sname tag name2 of student3 ascending list set order to ccc list sele 1 use student list sele 2 use course list sele 3 use grade list sele 2 list go 1 ?cno ?cno,cname ?cno,cname,3->grade ?cno,cname,grade->grade set ralation to cno into grade set relation to cno into grade list sele 2 list set relation to cno into grade set relation to cno into 3 sele 3 set relation to cno into course sele 1 list set index to student set order to sno list sele 2 set index to course set order cno set order to cno list sele 3 set index to grade set order to cno list sele 2 set relation to cno into grade list go 2 disp ?grade->cno go 4 disp ?grade->cno list sele 3 list go 1 ?cno,course->cno sele 2 ?cno,grade->cno go 4 ?cno,grade->cno