有关系代数表达式: [图...
有关系代数表达式:与其执行结果等价的pgSQL语句为()。
A、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam,examinee WHERE examinee.eeid=eeexam.eeid;
B、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam CROSS JOIN examinee WHERE examinee.eeid=eeexam.eeid;
C、SELECT DISTINCT eeid,eename,eid FROM eeexam NATURAL JOIN examinee;
D、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam JOIN examinee ON examinee.eeid=eeexam.eeid;
E、SELECT DISTINCT eeid,eename,eid FROM eeexam JOIN examinee USING(eeid);
F、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam,examinee;
G、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam CROSS JOIN examinee;
H、SELECT DISTINCT eeid,eename,eid FROM eeexam NATURAL JOIN examinee WHERE examinee.eeid=eeexam.eeid;
I、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam JOIN examinee WHERE examinee.eeid=eeexam.eeid;