【简答题】有关系代数表达式:【图片】与其执行结果等价的pgSQL语句为( )。A. SELECT * FROM eeexam,examinee WHERE examinee.eeid=eeexam.eeid;B. SELECT * FROM eeexam CROSS JOIN examinee WHERE examinee.eeid=eeexam.eeid;C. SELECT * FROM eeexam ...
【简答题】What do you think of British people and American people? You might think that there are no differences between the people in the two countries. After all they speak the same language, don't they? But ...
【简答题】有关系代数表达式:【图片】与其执行结果等价的pgSQL语句为( )。A. SELECT * FROM eeexam,examinee WHERE examinee.eeid=eeexam.eeid;B. SELECT * FROM eeexam CROSS JOIN examinee WHERE examinee.eeid=eeexam.eeid;C. SELECT * FROM eeexam ...