现要查找缺少成绩(Grade)的学生学号(Snum),相应的SQL语句是
A、SELECT Snum FROM SC WHERE Grade=0 ;
B、SELECT Snum FROM SCWHERE Grade<=0;
C、SELECT Snum FROM SC WHERE Grade=NULL ;
D、SELECT SnumFROM SC WHERE Grade IS NULL
发布时间:2024-10-17 19:33:08
A、SELECT Snum FROM SC WHERE Grade=0 ;
B、SELECT Snum FROM SCWHERE Grade<=0;
C、SELECT Snum FROM SC WHERE Grade=NULL ;
D、SELECT SnumFROM SC WHERE Grade IS NULL