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(Sno,Tno)和{Cno,Cname,Grade,Tno,Tname} (Sno, Cno, Tno)和{Sno, Sname, Sex, Birthday, Cno} (Sno, Cno)和{Sno, Sname, Sex, Birthday, Cno, Cname, Grade} (Sno, Cno, Tno)和{Sno, Sname, Sex, Birthday, Tno, Tname}
(Sno,Tno)和Cno,Cname,Grade,Tno,Tname (Sno, Cno,Tno) 和Sno, Sname, Sex, Birthday, Cno (Sno, Cno)和Sno, Sname, Sex, Birthday, Cno, Cname, Grade (Sno, Cno,Tno)和Sno, Sname, Sex, Birthday, Tno, Tname
GROUP BY grade GROUP BY sno ORDER BY grade ORDER BY sno
SEI,ECT sno FROM SC WH ERE grade BETWEEN O AND 60 SELECT sno FROM SC WHERE grade<60 SELECT sno FROM SC HAVlNG grade BETWEEN O AND 60 SELECT sno FROM SC HAVING grade<60
ALTER TABLE SC SET GRADE+10 WHERE CNO='DB' ALTER TABLE SC SET GRADE=GRADE+10 WHERE CNO='DB' UPDATE SC SET GRADE+10 WHERE CNO='DB' UPDATE SC SET GRADE=GRADE+10 WHERE CNO='DB'
(Sno,Tno)和{Cno,Cname,Grade,Tno,Tname} (Sno, Cno,Tno) 和{Sno, Sname, Sex, Birthday, Cno} (Sno, Cno)和{Sno, Sname, Sex, Birthday, Cno, Cname, Grade} (Sno, Cno,Tno)和{Sno, Sname, Sex, Birthday, Tno, Tname}
GROUP BY grade GROUP BY sno ORDER BY grade ORDER BY sno
(Sno,Tno)和Cno,Cname,Grade,Tno,Tname (Sno,Cno,Tno)和Sno,Sname,Sex,Birthday,Cno (Sno,Cno)和Sno,Shame,Sex,Birthday,Cno,Cname,Grade (Sno,Cno,Tno)和Sno,Sname,Sex,Birthdayr,Tno,Tname